Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Hisahiro Einaga Last modified date:2020.07.20

Professor / Division of Functional Materials Science / Department of Advanced Materials Science and Engineering / Faculty of Engineering Sciences


Papers
1. Rongjie Qi, Pengfei Yu, Jiachen Zhang, Weiqi Guo, Yaoyu He, Hajime Hojo, Hisahiro Einaga, Qun Zhang, Xiaosong Liu, Zhi Jiang, Wenfeng Shangguan, Efficient visible light photocatalysis enabled by the interaction between dual cooperative defect sites, Applied Catalysis B: Environmental, 10.1016/j.apcatb.2020.119099, 274, 2020.10, Modifying photocatalyst with defects offers effective pathway to tailor light absorption properties, but may result in more sluggish kinetics. Therefore, enhanced light absorption often could not guarantee increased activity. Here, we report a dual defect strategy to extend light absorption with minimal loss in charge dynamics. Fine-tuned amount of dual defect, i.e., nitrogen defects and single-site copper, is simultaneously generated in polymer carbon nitride(PCN) through in-situ vapor diffusion method. Surface nitrogen defect extends the light absorption to long-wavelength via sub-band absorption. The interaction between nitrogen and single-site copper at certain concentration retains the charge dynamics by making the photogenerated electrons more delocalized through the newly-formed copper-nitrogen bonds. As a result, champion modified PCN exhibits robust hydrogen production activity, roughly 4.5-fold greater than the pristine counterpart in both visible and full light ranges. More intriguingly, this synergism provides PCN with efficient visible light activity even in faint tailing optical absorption region(>450 nm)..
2. Hao Guo, Yizhuo Li, Zhi Jiang, Zhixiang Zhang, Mingxia Chen, Hisahiro Einaga, Wenfeng Shangguan, Effective low-temperature catalytic abatement of benzene over porous Mn-Ni composite oxides synthesized via the oxalate route, Journal of Chemical Technology and Biotechnology, 10.1002/jctb.6280, 95, 4, 1008-1015, 2020.04, BACKGROUND: Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn-Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico-chemical characterizations, the factors affecting the activity of those Mn-Ni composite oxides were explored. RESULTS: Nitrogen (N2)-adsorption/desorption and X-ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface-adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn-Ni composite oxides. Accordingly, compared with MnOx, the Mn-Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn-Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface-adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn-Ni catalysts. CONCLUSIONS: The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn-Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture..
3. Xin Liu, Siyu Ding, Saki Shigenobu, Hajime Hojo, Hisahiro Einaga, Catalyst design of Pt/TiO2 microsphere for benzene oxidation under microwave irradiation, Catalysis Today, 10.1016/j.cattod.2020.05.021, 2020.01, Pt/TiO2 microspheres with sea-urchin like structures were prepared by sequential processes including the preparation of TiO2 by a hydrothermal method and the preheating of the TiO2, the deposition of Pt nanoparticles on the TiO2 surface, followed by post heating in O2/N2 and H2. The TiO2 and Pt/TiO2 catalysts were characterized by XRD, Raman, SEM, TEM and N2 adsorption studies. The average diameter of TiO2 microspheres was about 250 nm. The TiO2 microspheres were composed of TiO2 nanoparticles with the size of 20−30 nm. Pt particles with the size of 3 nm were highly dispersed on the TiO2 microsphere by liquid phase adsorption of colloidal Pt particles. The heating of TiO2 at 300 °C before and after the Pt deposition did not change the size of TiO2 microsphere and reduced the surface area from 238 to 137 m2 g−1. The Pt/TiO2 microsphere exhibited higher catalytic activity for benzene oxidation than Pt/TiO2 P25 under normal outer heating, whereas pristine TiO2 exhibited almost no activity. Activated carbon was used as a catalyst with a mixture of Pt/TiO2 microspheres when performing the catalytic reaction under microwave heating. The mixture of Pt/TiO2 and activated carbon showed higher benzene oxidation activity under microwave irradiation than under normal external heating. The mixture was applied to benzene adsorption-catalytic oxidation combined processes..
4. U. P.M. Ashik, Shusaku Asano, Shinji Kudo, Doan Pham Minh, Srinivas Appari, Einaga Hisahiro, Jun Ichiro Hayashi, The distinctive effects of glucose-derived carbon on the performance of ni-based catalysts in methane dry reforming, Catalysts, 10.3390/catal10010021, 10, 1, 2020.01, This study aimed to investigate the effect of carbon derived from glucose (C) on the physicochemical characteristics and catalytic activity of Ni, supported over SiO2, ZSM-5, and TiO2 in methane dry reforming. Among the Ni catalysts without C, Ni/SiO2 exhibited the highest CH4-CO2 conversion and stability at all experimented temperatures. On the other hand, the C-incorporated catalysts prepared by glucose impregnation, followed by pyrolysis, showed dissimilar performances. C improved the stability of Ni/SiO2 in the reforming at 650C and 750C and increased the CH4 and CO2 conversion to the level close to the thermodynamic equilibrium at 850C. However, this element did not substantially affect the activity of Ni/ZSM-5 and exerted a retarding effect on Ni/TiO2. Characterizations with H2-TPD, XRD, EXAFS, and STEM-EDS revealed that the different influences of C by the supports were attributed to the extent of metal dispersion and metal-support interaction..
5. Shoma Hamada, Hajime Hojo, Hisahiro Einaga, Effect of catalyst composition and reactor configuration on benzene oxidation with a nonthermal plasma-catalyst combined reactor, Catalysis Today, 10.1016/j.cattod.2018.07.055, 144-152, 2019.07, Plasma-catalysis system comprising surface discharge reactor (SDR)and catalysts were constructed and tested for benzene decomposition. In benzene oxidation with SDR, benzene conversion and the amount of COx formed monotonically increased with input energy, but the benzene decomposition behavior was not related with ozone formation. The loading of metal oxides, Al2O3, TiO2 and CeO2 in SDR greatly promoted benzene oxidation and CO2 formation. The highest activity was obtained with manganese oxides dispersed on ultrastable zeolite Y (Mn/USY). In the range of low input power, the amount of ozone formed increased with the input power, and ozone can be efficiently consumed in benzene oxidation by loading the Mn/USY catalyst in the latter part of SDR. In the higher power range where the amount of ozone decreased with increasing the power, the loading of Mn/USY catalyst inside the reactor was more effective because not only ozone but also short-lived species formed in SDR were utilized for benzene oxidation. The addition of water vapor to reaction gas did not affect benzene conversion and COx formation with SDR-Mn/USY catalyst system. The preadsorbed benzene on the Mn/USY catalyst can be oxidized to CO2 with high selectivity compared with homogeneous oxidation of benzene in SDR..
6. Yi Zhang, Jin Shi, Wenjian Fang, Mingxia Chen, Zhixiang Zhang, Zhi Jiang, Wenfeng Shangguan, Hisahiro Einaga, Simultaneous catalytic elimination of formaldehyde and ozone over one-dimensional rod-like manganese dioxide at ambient temperature, Journal of Chemical Technology and Biotechnology, 10.1002/jctb.6023, 94, 7, 2305-2317, 2019.07, Background: Formaldehyde (HCHO) and ozone (O3) are seriously hazardous materials to human health, especially in the indoor environment, and need to be inhibited. Manganese dioxide (MnO2) catalysts have been extensively studied in the field of environmental pollution owing to their various morphologies and crystal structures. In this study, one-dimensional rod-like MnO2 catalysts were prepared by a hydrothermal method. The crystal form and other factors affecting the activity were explored through an activity test and various characterization methods. The decomposition process of HCHO and O3 on the most active catalyst was analyzed by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS). Results: α-MnO2 displayed the best catalytic performance and achieved 90% HCHO conversion, 100% carbon dioxide (CO2) yield and 100% O3 decomposition under different experimental conditions. The characterization results illustrated that the crystal phase of α-MnO2 has a suitable tunnel structure for HCHO adsorption, also leading to greater mobility of adsorbed oxygen species, abundant oxygen vacancies and active surface oxygen species, which could be the reason for the superior catalytic performance of α-MnO2. Formate and dioxymethylene (DOM) species were identified as the dominant intermediates by in situ DRIFTS. The surface hydroxyl (OH) group was confirmed to play an essential role in the complete oxidation of carbonaceous intermediates into harmless CO2 and water (H2O). Conclusion: α-MnO2 exhibited the best catalytic performance among the as-prepared samples and can efficiently eliminate HCHO and O3 in the environment..
7. Kenji Taira, Hisahiro Einaga, The Effect of SO
2
and H
2
O on the Interaction Between Pt and TiO
2
(P-25) During Catalytic CO Oxidation, Catalysis Letters, 10.1007/s10562-019-02672-3, 149, 4, 965-973, 2019.04, The deactivation of noble metal catalysts by SO
2
and H
2
O is a common issue in the post combustion treatment of flue gases from sintering processes in the steel industry. In an effort to develop SO
2
-tolerant CO-oxidation catalysts, herein, we investigated the effect of SO
2
and H
2
O on the catalytic activity of Pt/TiO
2
(P-25) catalysts for CO oxidation using X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and diffuse-reflectance infrared Fourier-transform (DRIFT) spectroscopy. Pt/TiO
2
(P-25) catalysts, in the absence of SO
2
and presence of H
2
O, enhanced the activity and stability of CO oxidation, while being largely suppressed and irreversibly deactivated in the presences of SO
2
. The XPS and TEM results suggested that variations in the Pt particle size and oxidation state were not major causes of the deactivation. Instead, according to DRIFT spectra, the interaction between CO and H
2
O at the metal-support interface was weakened after the formation of TiOSO
4
on the TiO
2
surface in the presence of SO
2
. This resulted in a loss of the previously observed enhancement of CO oxidation under humid conditions. These results indicate that in the presence of SO
2
, the formation of TiOSO
4
is the major cause of irreversible deactivation. Therefore, removal of the TiOSO
4
layer from the TiO
2
surface is a crucial step for catalyst regeneration. Graphical Abstract: [Figure not available: see fulltext.]..
8. Hao Guo, Xin Liu, Hajime Hojo, Xin Yao, Hisahiro Einaga, Wenfeng Shangguan, Removal of benzene by non-thermal plasma catalysis over manganese oxides through a facile synthesis method, Environmental Science and Pollution Research, 10.1007/s11356-019-04264-5, 26, 8, 8237-8247, 2019.03, Three manganese oxide catalysts (MnO
x
) were synthesized via a simple method, and then they were introduced into the non-thermal plasma (NTP) system for benzene removal. The XRD and EXAFS results showed the MnO
x
were mainly in the Mn
3
O
4
phase, and from the analysis of N
2
adsorption/desorption isotherms, we knew the MnO
x
calcined at 250 °C (Mn250) had the largest surface area of 274.5 m
2
 g
−1
. Besides, Mn250 also exerted higher benzene adsorption capacity (0.430 mmol g
−1
) according to C
6
H
6
-TPD. O
2
-TPD indicated that Mn250 showed better oxygen mobility than Mn300. Moreover, by analyzing XPS results, it revealed that Mn250 exhibited rich abundant of surface adsorbed oxygen species (O
ads
) and moderate ratio of Mn
4+
/Mn
3+
, and the reducibility temperature was also the lowest among all the MnO
x
catalysts drawn by H
2
-TPR profiles. As a result, Mn250 combined with NTP could remove 96.9% of benzene at a low input power of 3 W (benzene concentration 200 ppm, and GHSV 60,000 mL g
cat.

−1
 h
−1
), performing the best catalytic activity among the three catalysts and plasma only. Furthermore, the “NTP + Mn250” system also produced the highest CO
2
concentration and lowest CO concentration in downstream, and the residual O
3
after catalytic reaction was also the lowest, that is to say, the synergistic effect between NTP and Mn250 was more effective than other catalysts in benzene removal. [Figure not available: see fulltext.]..
9. Hao Guo, Zhixiang Zhang, Hajime Hojo, Mingxia Chen, Hisahiro Einaga, Wenfeng Shangguan, Catalytic Removal of Benzene at Mild Temperature over Manganese Oxide Catalysts, Catalysis Surveys from Asia, 10.1007/s10563-019-09268-2, 2019.01, Series of MnO
x
catalysts were synthesized through oxalate route and calcined at facile temperatures. Characterizations through XRD, N
2
-adsorption/desorption, HRTEM, C
6
H
6
-TPD, O
2
-TPD, XPS, and H
2
-TPR revealed that MnO
x
calcined at 250 °C (N250) with a main crystal phase of Mn
2
O
3
showed micro-mesopores and largest specific surface area, and therefore had a high adsorption capacity of C
6
H
6
. N250 also presented better oxygen mobility, rich surface adsorbed oxygen species (O
ads
), and proper ratio of surface Mn
4+
/Mn
3+
. The starting temperature of H
2
-TPR of N250 was the lowest among the obtained MnO
x
samples. As a result, N250 exhibited the lowest T
90
value of 191 °C in C
6
H
6
thermal catalytic oxidation (WHSV 60,000 mL g
cat
.
−1
 h
−1
, initial C
6
H
6
concentration 190 ppm) among all the catalysts, and this T
90
value is lower than those reported in many research. At last, a potential reaction pathway was proposed according to the results of in-situ FTIR measurement..
10. Akihiro Tou, Hyun Ha Kim, Hisahiro Einaga, Yoshiyuki Teramoto, Atsushi Ogata, Ozone-assisted catalysis of CO
In situ Fourier transform IR evidence of the cooperative effect of a bimetallic Ag-Pd catalyst, Chemical Engineering Journal, 10.1016/j.cej.2018.08.159, 355, 380-389, 2019.01, The room-temperature oxidation of CO using ozone-assisted catalysis (OAC) over monometallic or bimetallic catalysts supported on γ-Al2O3 is presented. Within the tested particle size range, ozone decomposition was insensitive to the size of the Ag particles (6.6–11.9 nm) at weight hourly space velocities of up to 360 L·g−1·h−1. Among the tested monometallic catalysts (Ag Pd, Fe, Mn, and Cu), Ag showed the highest activity for CO oxidation. Bimetallic catalysts (Ag-M or Pd-M where M = Cu, La, Ru, and Fe) were also considered by adding a second metal or perovskite oxide (LaFeO3) to Ag. A cooperative effect was observed with the bimetallic Ag-Pd catalyst for the OAC of CO oxidation at room temperature, whereas the other bimetallic catalysts showed slightly lower performance compared to the monometallic catalyst. A high ozone utilization efficiency of 0.94 was achieved with the bimetallic Ag-Pd/γ-Al2O3 catalyst. High-angle annular dark-field scanning tunneling electron microscopy (HAADF) and energy dispersive X-ray (EDX) spectroscopy measurements confirmed the proximity of the two components, which is essential for their interaction. The in situ FTIR measurements revealed that the cooperative effect in the bimetallic Ag-Pd catalyst involved modification of CO adsorption and the suppression of product accumulation. Two typical IR absorption bands of linear- (2090 cm−1) and bridge-CO (1918 cm−1) on Pd disappeared in the presence of Ag nanoparticles. Thus, the presence of Ag in contact with Pd inhibited the accumulation of carbonates, which led to enhanced catalytic performance. Adsorption site-dependent CO oxidation on Pd was also confirmed by the in situ Fourier transform IR measurement..
11. Yusuke Egawa, Shoma Hamada, Hisahiro Einaga, Contribution of catalytic performance of CeO2 in nonthermal plasma chemical reaction, Evergreen, 10.5109/1957498, 5, 3, 34-37, 2018.09, Benzene is a harmful material that must be to be removed from flue gases. In this study, the performance of a surface discharge plasma-catalysis combined reactor for benzene decomposition was studied. Benzene conversion and CO2 selectivity increased upon loading a CeO2 catalyst onto the plasma reactor. The conversion and selectivity depended on the surface area of the CeO2. FTIR studies revealed that byproduct organic compounds are formed on the CeO2, confirming that benzene oxidation occurs on the CeO2 catalysts..
12. Chanmin Lee, Yukwon Jeon, Taehyen Kim, Akihiro Tou, Joo Il Park, Hisahiro Einaga, Yong Gun Shul, Ag-loaded cerium-zirconium solid solution oxide nano-fibrous webs and their catalytic activity for soot and CO oxidation, Fuel, 10.1016/j.fuel.2017.10.007, 212, 395-404, 2018.01, The catalytic combustion of soot and CO is one of the key technologies required to meet rigorous emission standards. Recently, solid solution materials have been employed in heterogeneous catalysts because of their remarkable intrinsic activities and good stabilities. However, the low number of contact points between soot particles and the catalyst remains a challenge to enhancing catalytic performance. Thus, we herein report the preparation of Ce-ZrO2 solid solution nano-fibrous web catalysts with a hierarchical structure using an electrospinning method, where Ag particles were loaded onto the surface of the Ce-ZrO2 webs. X-ray diffraction, scanning transmission electron microscopy, and energy dispersive spectroscopic studies allowed us to investigate the morphological and crystal structures of the prepared Ce-ZrO2 and Ag/Ce-ZrO2 web catalysts. Moreover, the relationship between the Ce/Zr ratio and activated oxygen is discussed based on X-ray photoelectron spectroscopy results. Following the catalytic oxidation of soot and CO using our novel materials, we found that the Ce0.67Zr0.33O2 web exhibited higher catalytic activities than the Ce0.5Zr0.5O2 and Ce0.33Zr0.67O2 webs, respectively. In addition, Ag/Ce0.67Zr0.33O2 exhibited enhanced catalytic activity compared with the pristine Ce0.67Zr0.33O2 for the oxidation of both soot (e.g., 500 °C vs. 544 °C at 50% conversion) and CO (e.g., 282 °C vs. 408 °C at 50% conversion). It therefore appeared that our proposed Ce-ZrO2 solid solution nano-fibrous web catalysts bearing Ag particles exhibited superior redox properties and enhanced surface areas, and as such, are promising candidates for use in the oxidation of both soot and CO..
13. Yi Zhang, Minxia Chen, Zhixiang Zhang, Zhi Jiang, Wenfeng Shangguan, Hisahiro Einaga, Simultaneously catalytic decomposition of formaldehyde and ozone over manganese cerium oxides at room temperature
Promotional effect of relative humidity on the MnCeOx solid solution, Catalysis Today, 10.1016/j.cattod.2018.04.027, 2018.01, Manganese cerium oxides were synthesized by Pechini method and were used for investigating the performance of solid solution and the influence of water vapor presence on catalytic decomposition of formaldehyde and ozone at room temperature. Compared with the pristine manganese oxides and cerium dioxide, MnCeOx catalyst exhibited the best performance on HCHO oxidation and excellent ozone decomposition under dry air conditions although the CO2 yield is much lower than that of the solo cerium oxide. The as-prepared catalysts were characterized by XRD, XPS, N2 adsorption-desorption, H2-TPR and O2-TPD techniques. These characterization results revealed that the MnCeOx catalyst formed a solid solution of manganese and cerium, and exhibited relatively abundance oxygen vacancies and the most surface lattice oxygen species, enhancing remarkable adsorption and redox properties. MnCeOx catalyst has ∼100% HCHO conversion into CO2 in the catalytic activity test while the relative humidity is higher than 50% in this work, which could be suitable for indoor air purification. In situ DRIFTS results demonstrated that this excellent performance of HCHO complete oxidation is attributed to the continuously replenished surface hydroxyl groups generated from the interaction of water vapor and ozone on the surface of MnCeOx catalyst. This composite oxide is a promising catalyst for removing formaldehyde and ozone in the indoor environment..
14. Rohini Khobragade, Hisahiro Einaga, Suman Jain, Govindachetty Saravanan, Nitin Labhsetwar, Sulfur dioxide-tolerant strontium chromate for the catalytic oxidation of diesel particulate matter, Catalysis Science and Technology, 10.1039/c7cy02553j, 8, 6, 1712-1721, 2018.01, A sulfur dioxide (SO2)-tolerant, stable mixed oxide as an alternative to platinum (Pt) group metal (PGM) catalysts has been explored for the catalytic oxidation of particulate matter (PM) due to its low-cost, desirable physiochemical properties, thermal stability, tailoring options, etc. Herein, a mixed oxide of Sr and Cr was prepared via a solution combustion method by mixing stoichiometric amounts of Sr- and Cr-precursors with citric acid and urea as fuels followed by calcination at 800 °C in air. A pure mixed oxide phase of Sr and Cr (SrCrO4) (P21/n [14]) (a = 0.7090 nm, b = 0.7394 nm, and c = 0.6755 nm) has been successfully prepared, and the SrCrO4 particles are larger in size with semi-oval shapes due to their agglomeration at elevated temperatures. The SrCrO4 catalyst shows significantly improved intrinsic catalytic performance for PM oxidation in the tested temperature range as compared to the reference catalysts, Pt/Al2O3 and Pt-dispersed SrCrO4 (Pt/SrCrO4) (loading weight: 5 wt%) are used as internal reference catalysts. The onset temperature (i.e., intrinsic catalytic activity at 10% conversion, T10) is observed at 426 °C, which is significantly lower than that of the reference Pt/Al2O3 (T10 = 537 °C) and comparable with that of the Pt/SrCrO4 catalyst (T10 = 414 °C). The SrCrO4 catalyst shows a stable, multi-cycle PM oxidation performance for the tested five cycles, and both its crystalline structure and morphology remain unchanged even after its multiple cycles of use. The structure of the SrCrO4 catalyst is stable even after moisture and SO2 treatments, and the catalytic PM oxidation activity of SrCrO4 is not compromised even after these harsh treatments. Importantly, the SrCrO4 catalyst is also stable after PM oxidation conducted using real world PM from a heavy-duty vehicle. These results demonstrate that the mixed oxide phase of SrCrO4 shows promise for PM oxidation..
15. Kenji Taira, Hisahiro Einaga, Distribution ratio of Pt on anatase and rutile TiO2 particles, determined by x-ray diffraction and transmission electron microscopy analysis of Pt/TiO2(P25), Evergreen, 10.5109/2174853, 5, 4, 13-17, 2018.01, The TiO2(P25)-supported Pt catalyst has drawn significant interest from researchers due to its high activity. Analysis of the origin of this high catalytic activity must address the heterogeneity of the catalyst, since TiO2(P25) comprises both anatase and rutile phases. Thus, in this study, we demonstrate a simple method for determining the ratio of Pt particles on anatase and rutile by X-ray diffraction and transmission electron microscopy, without employing special equipment. Such a cost-effective method for determining the Pt distribution will accelerate research into the use of TiO2(P25) as a catalyst support..
16. Chanmin Lee, Jeongho Park, Yukwon Jeon, Joo Il Park, Hisahiro Einaga, Yen B. Truong, Illias L. Kyratzis, Isao Mochida, Jonghyun Choi, Yong Gun Shul, Phosphate-Modified TiO2/ZrO2 Nanofibrous Web Composite Membrane for Enhanced Performance and Durability of High-Temperature Proton Exchange Membrane Fuel Cells, Energy & Fuels, 10.1021/acs.energyfuels.7b00941, 31, 7, 7645-7652, 2017.07, An Aquivion/titanium zirconium oxide nanofibrous web composite membrane was prepared and tested as a proton exchange membrane in a hydrogen/air fuel cell. The incorporation of a small dose (9 wt % membrane) of a uniformly distributed electrospun titanium zirconium oxide (TiO2/ZrO2; Ti/Zr = 1:1 atomic ratio) nanofibrous web significantly improved hydromechanical stability of the composite membranes, which exhibited approximately 2 times higher water retention and 30 times lower dimensional change than a pristine Aquivion membrane under in-water membrane hydration conditions. Phosphate functionalities were successfully added onto the nanofiber surface, as confirmed by X-ray photoelectron spectroscopy (XPS) analysis. The added phosphate functionality resulted in higher proton conductivity of the prepared composite membrane compared to the non-modified TiO2/ZrO2 nanofibrous web composite membrane [e.g., 0.027 S cm-1 versus 0.021 S cm-1 at 120°C and 40% relative humidity (RH)]. A single cell test also showed the effect of an added TiO2/ZrO2 nanofibrous web. A single cell with an Aquivion/TiO2/ZrO2 nanofibrous web composite membrane outperformed a single cell with a pristine Aquivion membrane in fully humidified conditions (100% RH at 75 and 90°C). The Aquivion/phosphate-modified TiO2/ZrO2 nanofibrous web composite membrane showed the best single cell performance at all four testing conditions, including the fully humidified medium-temperature conditions (e.g., Pmax = 1.18 W cm-2 at 75°C and 100% RH, and Pmax = 0.97 W cm-2 at 90°C and 100% RH) and partially humidified high-temperature conditions (Pmax = 0.45 W cm-2 at 120°C and 40% RH, and Pmax = 0.21 W cm-2 at 140°C and 20% RH). The composite membrane also displayed excellent durability evidenced by the accelerated lifetime (ALT) test results. Overall, the phosphate-modified TiO2/ZrO2 nanofibrous web composite membrane enhanced the electrical properties and durability of the fuel cell, especially at high temperatures (>120°C)..
17. Chanmin Lee, Yong Gun Shul, Hisahiro Einaga, Silver and manganese oxide catalysts supported on mesoporous ZrO2 nanofiber mats for catalytic removal of benzene and diesel soot, Catalysis Today, 10.1016/j.cattod.2016.05.050, 281, 460-466, 2017.03, Mesoporous zirconia (ZrO2) nanofibers were synthesized by an electrospinning method and calcination at 600 °C. Ag and Mn oxides were separately or simultaneously deposited on the ZrO2 nanofibers by impregnation methods. The structure of the ZrO2 supported nanofiber materials were examined by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Ag and Mn oxides were homogeneously deposited on the surface of ZrO2 nanofibers. Metallic Ag species and Mn2O3 were formed on the ZrO2 nanofibers when they were separately deposited, whereas the codeposition of Ag and Mn changed the oxidation state of Mn oxides on the catalyst surface. The supported catalysts were evaluated for their soot and benzene oxidation performance. The co-deposition of Ag and Mn lowered the light-off temperature for benzene oxidation. The soot oxidation performance was comparable for the Ag/ZrO2, Mn/ZrO2 and Ag-Mn/ZrO2 catalysts under tight contact mode, whereas Ag/ZrO2 exhibited the highest activity and the activity decreased with decreasing the Ag content under loose contact mode..
18. Yukwon Jeon, Chanmin Lee, Junki Rhee, Gicheon Lee, Jae ha Myung, Myunggeun Park, Joo Il Park, Hisahiro Einaga, Yong Gun Shul, Autothermal reforming of heavy-hydrocarbon fuels by morphology controlled perovskite catalysts using carbon templates, Fuel, 10.1016/j.fuel.2016.09.065, 187, 446-456, 2017.01, A novel synthesis of morphology-controlled perovskite networked with LaCr0.8Ru0.2O3 nanoparticles was introduced using activated carbons as sacrificial templates. These catalysts were used for the hydrogen production by heavy-hydrocarbon autothermal reforming. To investigate the effect of the carbon templates, morphology-controlled perovskites using activated carbons and a non-templated catalyst were prepared to determine how carbon templates influence the chemical structure of the perovskite. The carbon templates produced a crystalline structure with the well incorporation of Ru under mild calcination conditions. The morphology of the hollow fibers provided a higher specific surface area than that of the porous grain catalyst with a similar average particle size (∼80 nm). It was found that the hollow fibers showed a unique pore structure with large macropores from 1 to 100 μm, which might offer a higher surface area and enhanced mass transfer of the reactants. This provided a higher activation energy for H2 production than the porous grain and non-templated catalysts during the autothermal reforming of heavy hydrocarbons. As a result, the fibrous feature and well-defined chemical structure were crucial factors when cracking the hydrocarbon chain. The hollow fiber catalyst showed high reforming efficiency for H2 production (>65 mol%) from heavy-hydrocarbon fuels during long-term experiments, featuring substantial durability with low carbon deposition and no structural changes..
19. Shi Chao Qi, Lu Zhang, Hisahiro Einaga, Shinji Kudo, Koyo Norinaga, Hayashi Jun-Ichiro, Nano-sized nickel catalyst for deep hydrogenation of lignin monomers and first-principles insight into the catalyst preparation, Journal of Materials Chemistry A, 10.1039/c6ta08538e, 5, 8, 3948-3965, 2017.01, This paper reports, for the first time, complete arene hydrogenation of phenolic compounds as lignin monomers over a non-noble metal catalyst supported by a general material. A type of nano-sized Ni catalyst was prepared in ethanol and in situ supported by ZSM-5 zeolite through general borohydride reduction of Ni2+ to Ni0, but with application of a simple ligand, pyridine. This catalyst showed an activity so high as to completely or near completely hydrogenate the aromatic rings of phenol and its twelve derivatives as potential lignin monomers at 180 °C. The activity was clearly higher than that of another type of conventional Ni catalyst prepared in the absence of pyridine. Analyses of the catalysts by TEM/EDS, XPS, XAFS and others demonstrated that pyridine had crucial roles in selective formation of nano-sized Ni and maintenance of its activity by appropriate interaction with the support. This paper also shows our theoretical approach to the mechanism of the borohydride reduction. First-principles calculations based on density functional theory (DFT) revealed the reaction pathway from Ni2+ to Ni0 and the role of pyridine, which was validated by some experimental facts. The DFT calculations also explain the variety of reactivities of the lignin monomers, which are strongly influenced by their molecular electrostatic and steric nature..
20. Hisahiro Einaga, Wataru Yoshida, Chanmin Lee, Keisuke Kusaba, Catalytic Properties of CeO2-Supported LaMnO3 for NO Oxidation, Catalysis Letters, 10.1007/s10562-016-1878-3, 146, 12, 2495-2503, 2016.12, Abstract: CeO2-supported LaMnO3 perovskite oxides were prepared to study their catalytic properties in the oxidation of NO to NO2. To prepare the catalyst and investigate the interaction between LaMnO3 and CeO2, two deposition methods were used. Extended X-ray absorption fine structure studies confirmed that perovskite oxide phases were formed on the CeO2 support. Moreover, X-ray photoelectron spectroscopy and temperature-programmed reduction with H2 studies revealed that the reduction temperatures for perovskite oxides and CeO2 support decreased by the deposition followed by calcination at 650 °C, and that the interaction between the LaMnO3 and CeO2 support can be controlled by changing the preparation method. The LaMnO3/CeO2 catalyst in which LaMnO3 was highly dispersed on CeO2 exhibited higher NO oxidation activity than either LaMnO3 or CeO2. The thermal stability of the LaMnO3/CeO2 catalyst was compared with that of alumina-supported LaMnO3 catalysts over 850–1050 °C. Graphical Abstract: [Figure not available: see fulltext.].
21. Kenji Taira, Kenji Nakao, Kimihito Suzuki, Hisahiro Einaga, SOx tolerant Pt/TiO2 catalysts for CO oxidation and the effect of TiO2 supports on catalytic activity, Environmental Science & Technology, 10.1021/acs.est.6b01652, 50, 17, 9773-9780, 2016.09, We developed a new technique for mitigating catalyst deactivation caused by SO2 in exhaust gases. A series of 0.1 wt %-Pt/TiO2 catalysts with different surface, crystal, and pore structures were prepared and tested for CO oxidation activity in the presence of SO2 and H2O. The order of the CO oxidation activity under the influence of SO2 was much different from that in the absence of SO2. Catalysts with a high ratio of larger pores exhibited higher catalytic activity under the influence of SO2 and H2O in the temperature range of 250-300 °C, whereas other parameters, such as BET surface area and crystal structure of the TiO2 support, had minor effects on the CO oxidation activity. The oxidation state of Pt differed significantly depending on the kind of TiO2 support. Some catalysts were less active without H2 reduction pretreatment due to the presence of oxidized Pt species..
22. Chanmin Lee, Yukwon Jeon, Satoshi Hata, Joo Il Park, Ryutaro Akiyoshi, Hikaru Saito, Yasutake Teraoka, Yong Gun Shul, Hisahiro Einaga, Three-dimensional arrangements of perovskite-type oxide nano-fiber webs for effective soot oxidation, Applied Catalysis B: Environmental, 10.1016/j.apcatb.2016.03.001, 191, 157-164, 2016.08, Perovskite-type oxides have been widely applied in heterogeneous catalytic reactions, such as soot oxidation. However, a poor contact point between the catalyst and solid reactant (soot) often limits the catalytic performance. Here, we report La1 - xSrxCo0.2Fe0.8O3 - δ perovskite oxide catalysts with a unique three-dimensional (3D) fiber web structure that increases the high-contact area by trapping soot in the unique pore structure for effective catalytic activity. This feature was carefully analyzed using scanning transmission electron microscopy (STEM) tomography to investigate the location of the soot on the web. The structure of the web, with a thickness of approximately 55 μm, indicated that the soot particles were caught by the 3D pores between the fibers. The relationship between the Sr amount and activate oxygen was also characterized by means of XPS. The results show that the Sr amount of 0.4 produced the highest amount of active oxygen species (O-) that are essential for soot oxidation reaction. The developed catalyst exhibited a good catalytic performance due to the optimized perovskite chemical structure and the greatly increased number of the contact points owing to the 3D inter-fiber spaces. Hence, our proposed approach is reasonable for application to real soot combustion processes and can also be easily extended to numerous other catalytic processes to enhance the catalytic activity..
23. Chanmin Lee, Yukwon Jeon, Hata, Satoshi, JOO-IL PARK, Ryutaro Akiyoshi, H. Saito, Yasutake Teraoka, Yong-Gun Shul, Hisahiro Einaga, Three-dimensional Arrangements of Perovskite-type Oxide Nano-fiber Webs for Effective Soot Oxidation, Applied Catalysis B: Environmental, 2016.06.
24. Chanmin Lee, Yong-Gun Shul, Hisahiro Einaga, Silver and Manganese Oxide Catalysts Supported on Mesoporous ZrO2 Nanofiber Mats for Catalytic Removal of Benzene and Diesel Soot, Catalysis Today, in press., 2016.06.
25. Hisahiro Einaga, Akihiro Kiya, Effect of aging on the CO oxidation properties of copper manganese oxides prepared by hydrolysis-coprecipitation using tetramethyl ammonium hydroxide, REACTION KINETICS MECHANISMS AND CATALYSIS, 10.1007/s11144-016-0974-0, 117, 2, 521-536, 2016.04.
26. Hisahiro Einaga, Yusaku Nasu, Manabu Oda, H. Saito, Catalytic performances of perovskite oxides for CO oxidation under microwave irradiation, CHEMICAL ENGINEERING JOURNAL, 10.1016/j.cej.2015.07.051, 283, 97-104, 2016.01.
27. Hisahiro Einaga, Ryo Shiranita, H. Saito, Hata, Satoshi, Codeposition of Colloidal Platinum Particles and Iron Chloride Precursor on TiO2 for Efficient Catalytic Oxidation of CO to CO2, CHEMISTRY LETTERS, 10.1246/cl.150903, 44, 12, 1786-1788, 2015.12.
28. Hironobu Shimokawa, Hajime Kusaba, Hisahiro Einaga, Yasutake Teraoka, Factors Affecting the Catalytic Performance of La-K-Mn-O Perovskite Oxides for Diesel Soot Oxidation, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 10.1246/bcsj.20150186, 88, 10, 1486-1493, 2015.10.
29. Chanmin Lee, Joo Il Park, Yong Gun Shul, Hisahiro Einaga, Yasutake Teraoka, Ag supported on electrospun macro-structure CeO2 fibrous mats for diesel soot oxidation, Applied Catalysis B: Environmental, 10.1016/j.apcatb.2015.03.008, 174-175, 185-192, 2015.09, Ceria oxide (CeO2) nanofibers with diameters of 241-253nm were produced via the electrospinning method. They were then applied as new support materials for silver nanoparticles and their effectiveness as diesel soot oxidation catalysts was examined. The crystal structure of the Ag was confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), and energy dispersive spectroscopy (EDS). The diesel soot oxidation experiment was performed using a mixture of carbon black and the fabricated catalyst. In the tight contact and loose contact modes, the highest temperatures of both the CeO2-fiber-supported Ag catalysts (Ag/CeO2) calcined at 500°C and the CeO2 fibers calcined at 500°C were shifted to a lower temperature range, compared with JRC-CEO-3 (a commercial catalyst). In addition, the activation energy also showed similar behavior. Thus, the fibrous CeO2 and Ag/CeO2 have been shown to be effective and promising catalysts for soot oxidation..
30. Hisahiro Einaga, Nanako Maeda, Yusuke Nagai, Catalytic Properties of Supported Metal Oxides for Oxidation Using Ozone, Catalysis Science & Technology, 10.1039/C5CY00315F, 5, 3147-3158, 2015.08.
31. Teruaki Asada, Hisahiro Einaga, Hajime Kusaba, Yasutake Teraoka, Preparation of Supported LaMnO3 Catalysts by Selective Deposition on Alumina and Their Catalytic Activity for Propane Oxidation, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 10.1246/bcsj.20150111, 88, 8, 1036-1046, 2015.08.
32. Kazuhiro Uemura, Srinivas Appari, Shinji Kudo, Jun-ichiro Hayashi, Hisahiro Einaga, Koyo Norinaga, In-situ reforming of the volatiles from fast pyrolysis of ligno-cellulosic biomass over zeolite catalysts for aromatic compound production, FUEL PROCESSING TECHNOLOGY, 10.1016/j.fuproc.2014.10.002, 136, 73-78, 2015.08.
33. Tomoki Uchiyama, Reiko Karita, Maiko Nishibori, Hisahiro Einaga, Yasutake Teraoka, Preparation and Characterization of Pd Loaded Sr-deficient K2NiF4-type (La, Sr)2MnO4 Catalysts for NO-CO reaction, Catalysis Today, 10.1016/j.cattod.2014.09.033, 251, 7-13, 2015.07.
34. Chanmin Lee, Joo-Il Park, Yong-Gun Shul, Hisahiro Einaga, Yasutake Teraoka, Ag Supported on Electrospun Macro-structure CeO2 Fibrous Mats for Diesel Soot Oxidation, Applied Catalysis B: Environmental, 185-192, 2015.07.
35. Hisahiro Einaga, Nanako Maeda, Yusuke Nagai, Comparison of catalytic properties of supported metal oxides for benzene oxidation using ozone, Catalysis Science and Technology, 10.1039/c5cy00315f, 5, 6, 3147-3158, 2015.06, Catalytic oxidation of gaseous benzene using ozone over SiO2-supported metal oxides (oxides of Mn, Fe, Co, Ni, and Cu) was performed at 343 K. The supported metal oxides were prepared from metal nitrates via impregnation followed by calcination at 873 K. X-ray diffraction studies revealed that aggregated metal oxides were formed on the supports. The quantities of the exposed metal oxides on SiO2 were determined using temperature-programmed desorption of formic acid species adsorbed on the catalysts. The turnover frequencies (TOFs) for ozone decomposition and catalytic oxidation of benzene with ozone were also compared for the supported metal oxides. The TOFs for ozone decomposition with the supported metal oxides decreased in the order: Cu > Co ~ Ni > Fe > Mn. Conversely, the SiO2-supported Mn oxide (Mn/SiO2) catalyst exhibited the highest activity for catalytic oxidation of benzene with ozone and the highest efficiency for ozone utilization. FTIR studies revealed that benzene ring cleavage continuously proceeded on the Mn/SiO2 catalyst, and oxygen-containing species, which were readily oxidized to CO2 and CO in the presence of ozone, accumulated on the catalyst surface. The Fe-, Co-, Ni-, and Cu-oxides suffered from catalyst deactivation due to the build-up of by-product compounds, which was attributed to their low activity for oxidation of these substances. These results suggest that the most important steps in benzene oxidation with ozone on metal oxides are the formation and oxidation of by-product compounds. The higher activity of the Mn oxide catalyst for benzene oxidation is ascribed to the facile oxidation of these by-product compounds..
36. Hisahiro Einaga, Nanako Maeda, Shintaro Yamamoto, 寺岡 靖剛, Catalytic properties of copper-manganese mixed oxides supported on SiO2 for benzene oxidation with ozone, CATALYSIS TODAY, 10.1016/j.cattod.2014.09.018, 245, 22-27, 2015.05.
37. Tomoki Uchiyama, Maiko Nishibori, Hisahiro Einaga, Yasutake Teraoka, Formation of tetravalent Fe ions in LaFeO3 perovskite through mechanochemical modification by ball milling, Journal of the American Ceramic Society, 10.1111/jace.13513, 98, 4, 1047-1051, 2015.04, Mechanochemical modification of previously synthesized LaFeO3 perovskite-type oxide by a high-energy ball milling was investigated to introduce Fe4+ ions or transform some Fe3+ into Fe4+ in LaFeO3. X-ray absorption fine structure studies revealed that the formation of Fe4+ ions into LaFeO3 perovskite has been achieved at first time by ball milling at room temperature without any additives or replacement of La3+ ions by some divalent cations. The structural model of Fe4+ containing LaFeO3 could be described as with a modified perovskite having equal amounts of La and Fe vacancies, which is supported by a good correlation between the results of Fe K-edge XANES spectra and O2-TPD. The synthesis of Fe4+-containing LaFeO3 perovskite by ball milling was able to produce the O2 adsorption capacity of nonsubstituted perovskite-type oxide..
38. Hisahiro Einaga, Junya Tokura, Yasutake Teraoka, Kazuhide Ito, Kinetic analysis of TiO2-catalyzed heterogeneous photocatalytic oxidation of ethylene using computational fluid dynamics, CHEMICAL ENGINEERING JOURNAL, 10.1016/j.cej.2014.11.017, 263, 325-335, 2015.03.
39. Akihiro Tou, Hisahiro Einaga, Yasutake Teraoka, Effect of co-deposition of LaFeO3 on the catalytic properties of Pd on Al2O3 support for CO–O2 and NO–CO reactions, Reaction Kinetics, Mechanisms and Catalysis, 10.1007/s11144-014-0823-y, 114, 2, 409-420, 2015.03, Pd/LaFeO3/Al2O3 catalysts were prepared by co-deposition of Pd and LaFeO3 perovskite oxides in the intrapores of Al2O3 by the incipient wetness method. Pd and LaFeO3 perovskite oxides were highly dispersed on Al2O3 in the inside pore. H2-TPR studies revealed that the oxidation state, dispersion and redox properties of Pd were affected by the presence of LaFeO3 with close proximity. The Pd and LaFeO3 co-deposited Al2O3 catalysts exhibited much higher activity for CO oxidation and NO–CO reaction than Pd/Al2O3 catalysts..
40. Hisahiro Einaga, Akihiro Kiya, Satoru Yoshioka, 寺岡 靖剛, Catalytic Properties of Copper Manganese Mixed Oxides Prepared by Coprecipitation Using Tetraammonium Hydroxide, Catalysis Science & Technology, 10.1039/C4CY00660G, 4, 3713-3722, 2015.02.
41. 服部 真史, Hisahiro Einaga, 大尾 岳史, Masaharu Tsuji, Efficient hydrogen production from formic acid using TiO2-supported AgPd@Pd nanocatalysts, JOURNAL OF MATERIALS CHEMISTRY A, 10.1039/c4ta06988a, 3, 8, 4453-4461, 2015.02.
42. Shu Jie Wang, Gu Chu Zou, Yao Xu, Ming Xia Chen, Wen Feng Shangguan, Hisahiro Einaga, Yasutake Teraoka, Ce-based catalysts for simultaneous removal of both diesel soot and NOx, Journal of Molecular Catalysis, 29, 1, 60-67, 2015.02, Ce-based oxides were prepared by citric acid complex method and characterized by nitrogen physisorption, XRD, BET, H2-TPR and XPS; their catalytic performances in simultaneous removal of diesel soot and NOx were investigated on a thermogravimetric apparatus and a tubular reactor. Co0.1/CeLa0.05 prevailed over all the detected materials in catalytic performance for simultaneous removal of soot and NOx. T50 of this catalyst (temperature for 50% soot combustion)was 301℃, and the yield of N2 was 41.4%. A majority of cobalt oxides were dispersed on the surface of Ce-La solid solution. The mutual transformation between Co3+ and Co2+enhanced the redox ability and oxygen storage capacity of pure ceria oxide, achieving lower temperature of combustion. Cerium-cobalt complex oxide doped with lanthanum presented a tremendous increase of surface area, leading to higher yield of N2. The formation of trace amount of LaCoO3 promoted oxygen vacancies creation, thus affecting positively to the soot combustion activity..
43. Hisahiro Einaga, Narihiro Urahama, 藤 章裕, 寺岡 靖剛, CO oxidation over TiO2-supported Pt-Fe Catalysts Prepared by Coimpregnation Methods, Catalysis Letters, 10.1007/s10562-014-1316-3, 1653-1660, 2014.10.
44. Hisahiro Einaga, Akihiro Kiya, Satoru Yoshioka, Yasutake Teraoka, Catalytic properties of copper-manganese mixed oxides prepared by coprecipitation using tetramethylammonium hydroxide, Catalysis Science and Technology, 10.1039/c4cy00660g, 4, 10, 3713-3722, 2014.10, Copper-manganese (Cu-Mn) mixed oxide catalysts were prepared by a coprecipitation technique from metal nitrates in aqueous solution using tetramethylammonium hydroxide (TMAH) as a pH regulator. The structures and properties of the mixed oxide catalysts were investigated by X-ray diffraction, extended X-ray absorption fine structure, X-ray photoelectron spectroscopy and H2-TPR studies. Spinel-type mixed oxides were mainly formed in the Cu-Mn mixed oxides in which Cu and Mn species occupied both tetrahedrally and octahedrally coordinated sites. The occupancy of Cu and Mn in these sites depended on the Cu/Mn ratio. The average oxidation state of Cu was evaluated to be 2+ and was almost independent of the Cu/Mn ratio; reduced Cu species were also formed on the surface sites. By incorporation of Cu into Mn oxides, the average oxidation state of Mn increased both in the bulk sites and on the surface sites. The concentration of Mn on the surface sites was higher than that in the bulk sites. The Cu-Mn mixed catalysts exhibited higher activity than corresponding single-metal oxides at the reaction temperature range of 343-403 K. Formation of Cu-Mn spinel-type oxides gave rise to the increase in the catalyst surface area and the rate for CO oxidation normalized by surface area, and the Cu-Mn mixed oxides with the Cu/Mn molar ratio of 1 exhibited the highest activity for CO oxidation. CO-TPR studies revealed that in the temperature range of 343-403 K, the lattice oxygen at the first layer of the mixed oxides reacted with CO to form CO2. This journal is.
45. 永長 久寛, 川原田純基, 木村加奈, 寺岡 靖剛, Preparation of platinum nanoparticles on TiO2 from DNA-protected particles, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2014.04.056, 455, 179-184, 2014.08.
46. 永長 久寛, 寺岡 靖剛, 尾形 敦, Catalytic Oxidation of Benzene by Ozone over Manganese Oxides Supported on USY zeolite, Journal of catalysis, 10.1016/j.jcat.2013.05.016, 305, 227-237, 2013.06.
47. 永長 久寛, 前田菜那子, 寺岡 靖剛, Effect of Catalyst Composition and Preparation Conditions on Catalytic Properties of Unsupported Manganese Oxides for Benzene Oxidation with Ozone, Applied Catalysis B: Environmental, 10.1016/j.apcatb.2013.05.041, 142-143, 406-413, , 2013.05.
48. Tou, A, Hisahiro Einaga, Yasutake Teraoka, Preparation of alumina-supported Pd and LaMnO3 catalysts with the site-selective deposition and their catalytic activity for NO-CO reaction, CATALYSIS TODAY, 10.1016/j.cattod.2012.04.033, 201, 103-108, 2013.03.
49. 永長 久寛, 望月啓介, Yasutake Teraoka, Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts, Catalysts, 10.3390/catal3010219, 3, 219-231, 2013.02.
50. Hironobu Shimokawa, Yasuyuki Kurihara, Hajime Kusaba, Hisahiro Einaga, Yasutake Teraoka, Comparison of catalytic performance of Ag- and K-based catalysts for diesel soot combustion, CATALYSIS TODAY, 10.1016/j.cattod.2011.10.030, 185, 1, 99-103, 2012.05.
51. H. Liu, J. Yuan, Z. Jiang, W. Shangguan, Hisahiro Einaga, Yasutake Teraoka, Roles of Bi, M and VO4 tetrahedron in photocatalytic properties of novel Bi0.5M0.5VO4 (M = La, Eu, Sm and Y) solid solutions for overall water splitting, Journal of Solid State Chemistry, 186, 70-75, 2012.05.
52. Hui Liu, Jian Yuan, Zhi Jiang, Wenfeng Shangguan, Hisahiro Einaga, Yasutake Teraoka, Roles of Bi, M and VO 4 tetrahedron in photocatalytic properties of novel Bi 0.5M 0.5VO 4 (M=La, Eu, Sm and Y) solid solutions for overall water splitting, Journal of Solid State Chemistry, 10.1016/j.jssc.2011.11.035, 186, 70-75, 2012.02, Novel Bi 0.5M 0.5VO 4 (BMV; M=La, Eu, Sm and Y) solid solutions were prepared and studied in this paper. All the samples were proved to produce H 2 and O 2 simultaneously from pure water under the irradiation of UV light. MO bond lengths were proved to increase with M cations by refining cell parameters and atomic positions. Besides, band gaps, energy gaps and photocatalytic activities of BMV also changed with M cations. Both of MO and VO bond lengths were suggested to account for this phenomenon. Inactive A 0.5Y 0.5VO 4 (A=La, Ce) for water splitting proved incorporation of Bi rather than distortion of VO 4 tetrahedron was a critical factor for improving efficiency of overall water splitting by facilitating the generation of electron and hole with lighter effective masses. Replacement of Bi by M cations not only gave indirect effect on band structure but also raised position of conduction band minimum to meet requirement of H 2 production..
53. Cheol-Beom Lim, 永長 久寛, Yoshihiko Sadaoka, 寺岡 靖剛, Preliminary study on catalytic combustion-type sensor for the detection of diesel particulate matter, SENSORS AND ACTUATORS B-CHEMICAL, 10.1016/j.snb.2011.08.009, 160, 1, 463-470, 2011.12.
54. H. Liu, J. Yuan, Z. Jiang, W. Shangguan, H. Einaga and Y. Teraoka, Novel photocatalyst of V-based solid solutions for overall water splitting, Journal of Materials Chemistry, 21, 41, 16535-16543, 2011.10.
55. Cheol-Beom Lim, 草場 一, 永長 久寛, 寺岡 靖剛, Catalytic performance of supported precious metal catalysts for the combustion of diesel particulate matter, CATALYSIS TODAY, 10.1016/j.cattod.2011.03.062, 175, 1, 106-111, 2011.10.
56. K. Kimura, H. Einaga and Y. Teraoaka, Preparation of highly dispersed platinum catalysts on various oxides by using polymer-protected nanoparticles, Catalysis Today, 164, 1, 88-91, 2011.06.
57. H. Einaga, Y. Teraoka and A. Ogata, Benzene Oxidation with Ozone over Manganese Oxide Supported on Zeolite Catalysts, Catalysis Today, 164, 1, 571-574, 2011.06.
58. H. Iwakura, H. Einaga, and Y. Teraoka, , Relationship between Cation Arrangement and Photocatalytic Activity for Sr-Al-Nb-O Double Perovskite, Inorganic Chemistry, 49, 11362-11369., 2010.12.
59. H. Einaga, S. Hyodo, and Y. Teraoka, Complete Oxidation of Benzene over Perovskite-type Oxide Catalysts, Topics in Catal., 53, 629, 2010.06.
60. A. Ogata, K. Saito, H.-H. Kima, M. Sugasawaa, H. Aritani, H. Einaga, Performance of an ozone decomposition catalyst in hybrid plasma reactors for volatile organic compound removal, Plasma Chem. Plasma Process, 30, 33, 2010.02.
61. M. Harada, K. Saijo, N. Sakamoto, H. Einaga, Small-Angle X-ray Scattering Study of Metal Nanoparticles Prepared by Photoreduction in Aqueous Solutions of Sodium Dodecyl Sulfate, Colloid. Surf. A: Physicochem. Engineer. Aspects, 345, 41-50, 2009.08.
62. H. Einaga and A. Ogata, Catalytic Oxidation of Benzene with Ozone over SiO2-supported Manganese Oxides, J. Hazard. Mater., 164, 1236-1241, 2009.03.
63. H. Einaga, M. Harada and A. Ogata, Relationship between the Structure of Manganese Oxides on Alumina and Catalytic Activities for Benzene Oxidation with Ozone, Catal. Lett., 129, 422-427, 2009.03.
64. H. Shimokawa, H. Kusaba, H. Einaga, Y. Teraoka, Effect of Surface Area of La-K-Mn-O Perovskites Catalysts on Diesel Particulate Oxidation, Catal. Today, 139, 8-14, 2008.12.
65. Masafumi Harada, Hisahiro Einaga, In-Situ XAFS Studies of Au Particle Formation by Photoreduction in Polymer Solutions, Langmuir, 23, 6536 - 6543, 2007.06.
66. H. Einaga, S. Futamura, Catalytic oxidation of benzene with ozone over Mn ion-exchanged zeolites, Catal. Commun., 8, 557-560., 2007.01.
67. Masafumi Harada, Hisahiro Einaga, Preparation of Pt/Rh Bimetallic Colloidal Particles in Polymer Solutions Using Borohydride-Reduction, J. Colloid.Interf. Sci., 308, 568-572 (2007)., 2007.01.
68. H. Einaga, S. Futamura,, Effect of Water Vapor on Catalytic Oxidation of Benzene with Ozone on Alumina-supported Manganese Oxides, J. Catal., 243, 446-450., 2006.10.
69. M. Harada, H. Einaga, Formation Mechanism of Pt Particles by Photo-reduction of Pt Ions in Polymer Solutions, Langmuir, 22, 2371-2377., 2006.03.
70. S.-M. Oh, H.-H. Kim, H. Einaga, A. Ogata, S. Futamura and D.-W. Park, Zeolite-Combined Plasma Reactor for Decomposition of Toluene, Thin Solid Films, 506-507, 418-422., 2006.01.
71. H. Einaga, Effect of Silver Deposition on TiO2 for Photocatalytic Oxidation of Benzene in Gas Phase, React. Kin. Catal. Lett., 88, 357-362., 2006.01.
72. H. Hori, E. Hayakawa, A. Yamamoto, N. Yamashita, S. Taniyasu, H. Einaga, S. Kutsuna, H. Kitagawa, R. Arakawa, Efficient decomposition of perfluorocarboxylic acids in water by photochemical approaches, Organohalogen Compounds, pp.776-776, Toronto., 2005.08.
73. S.-M. Oh, H.-H. Kim, A. Ogata, H. Einaga, S. Futamura, Dong-Wha Park, Effect of zeolite in surface discharge plasma on the decomposition of toluene, Catal. Lett., 99, 101-104., 2005.01.
74. H. Einaga, M. Harada, Photochemical Preparation of PVP-stabilized Platinum Colloids and Their Deposition on Titanium Dioxide, Langmuir, 21, 2578-2584., 2005.01.
75. H. Einaga, S. Futamura, Oxidation Behavior of of Cyclohexane on Alumina-supported Manganese Oxides with Ozone, Appl. Catal. B: Environ., 60, 49-55., 2005.01.
76. M. Harada, H. Einaga, Photochemical Deposition of Platinum on TiO2 by using Poly(vinyl Alcohol) as an Electron Donor and a Protecting Polymer, Catal. Commun., 5, 63-67., 2004.01.
77. H. Einaga, S. Futamura, Comparative Study on the Catalytic Activities of Alumina-supported Metal Oxides for Oxidation of Benzene and Cyclohexane with Ozone, React. Kin. Catal. Lett., 81, 121-128., 2004.01.
78. S. Futamura, H. Einaga, H. Kabashima and Lee Yong Hwan, Synergistic Effect of Silent Discharge Plasma and Catalysts on Benzene Decomposition, Catal. Today, 89, 89-95., 2004.01.
79. H. Einaga, T. Ibusuki, S. Futamura, Photocatalytic Oxidation of Benzene in Air, J. Solar Energy Eng., 126, 789-793., 2004.01.
80. H. Einaga, S. Futamura, Catalytic Oxidation of Benzene with Ozone over Alumina-supported Manganese Oxides, J. Catal., 227, 304-312., 2004.01.
81. H. Hori, E. Hayakawa, H. Einaga, S. Kutsuna, K. Koike, T. Ibusuki, H. Kitagawa, R. Arakawa, Decomposition of Environmentally Persistent Perfluorooctanoic Acid in Water by Photochemical Approaches, Environ. Sci. Technol., 38, 6118-6124., 2004.01.
82. H. Hori, Y. Takano, K. Koike, K. Takeuchi, H. Einaga, Decomposition of Environmentally Persistent Trifluoroacetic Acid to Fluoride Ions by a Homogeneous Photocatalyst in Water, Environ. Sci. Technol., 37, 418-., 2003.01.
83. H. Einaga, M. Harada, S. Futamura, T. Ibusuki, Generation of Active Sites for CO Photooxidation on TiO2 by Platinum Deposition, J. Phys. Chem. B, 107, 9290-9297., 2003.01.
84. H. Hori, Y. Takano, K. Koike, S. Kutsuna, H. Einaga, T. Ibusuki, Photochemical Decomposition of Pentafluoropropionic Acid to Fluoride Ions with A Water-soluble Heteropolyacid Photocatalyst, Appl. Catal., B: Environmental, 46, 333-340., 2003.01.
85. H Einaga, S. Futamura, T. Ibusuki, Heterogeneous Photocatalytic Oxidation of Benzene, Toluene, Cyclohexene and Cyclohexane in Humidified Air, Comparison of Decomposition Behavior on Photoirradiated TiO2 Catalyst, Appl. Catal., B: Environ., 38, 215-., 2002.01.
86. H. Einaga, S. Futamura, T. Ibusuki, Complete Oxidation of Benzene in Gas Phase by Platinized Titania Photocatalysts, Environ. Sci. & Technol., 35, 1880 (2001)., 2001.01.
87. H. Einaga, S. Futamura, T. Ibusuki, Photocatalytic Decomposition of Benzene over TiO2 in a Humidified Airstream, Phys. Chem. Chem. Phys, 1, 4903-4908, 1999.12.
88. H.Einaga, A. Ogata, S. Futamura, T. Ibusuki, The Stabilization of Active Oxygen Species by Pt Supported on TiO2, Chem. Phys. Lett., 338, 303 (2001)..
89. H. Einaga, S. Futamura, T. Ibusuki, Improvement of Catalyst Durability in Benzene Photooxidation by Rhodium Deposition on TiO2, Chem. Lett., 582-583 (2001)..
90. H. Hori, E. Hayakawa, K. Koike, H. Einaga, T. Ibusuki, Decomposition of Nonafluoropentanoic Acid by Heteropolyacid Photocatalyst H3PW12O40 in Aqueous Solution, J. Mol. Catal. A: Chem., 211, 35-41..
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