Kyushu University Academic Staff Educational and Research Activities Database
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Hayashi Jun-ichiro Last modified date:2023.10.10

Professor / Science and Engineering of Materials and Devices, Interdisciplinary Graduate School of Engineering Sciences
Department of Advanced Device Materials
Institute for Materials Chemistry and Engineering

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Undergraduate School
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Introduction of the laboratory (Laboratory of Microprocess Control, Division of Advanced Device Materials, Institute of Materials Chemistry and Engineering) .
Academic Degree
PhD., Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Chemical Reaction Engineering
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
(1) Research on conversion/utilization of carbonaceous resources and development of carbonaceous materials at Institute for Materials Chemistry and Engineering (2009-)
(2) Education of chemical engineering and chemical reaction engineering at Interdisciplinary Graduate School of Engineering Sciences(2009-)
(3) Research and education of Engineering Sciences of Carbon Resources Utilization at Research & Education Center of Carbon Resources(2009-2017)
(4) Research carbonaceous resource conversion and carbon recycling technologies at Trans-disciplinary Research and Education Center of Green Technology (2018-)
(5) Promotion of Global COE Program (Novel Carbon Resource Sciences) (2009-2012)
(6) Promotion of Program for Leading Graduate Schools Advanced Graduate Course in Global Strategy for Green Asia ) (2012-)
(7) Activities in academic societies (eg., Director of Energy Division of The Society of Chemical Engineers, Japan (2007-2009), Member of Advisory Board of Energy & Fuels (an American Chemical Society Journal), 2010-present), Chair of Committee for Post-Vision of Society of Chemical Engineers, Japan (2011-2012), A Director of The Society of Chemical Engineers, Japan (2015-2017), etc.
(8) Activities as an expert of chemical engineering (eg., member of committees in organizations such as Ministry of Economy, Trade and Industry, Japan (METI), and New Energy and Industrial Technology Development Organization, Japan (NEDO), a project leader of an R&D project on advanced integrated coal gasification combined cycles)
(9) Participation of R&D of industrial processes (eg., R&D projects on biomass or coal gasification for power generation or energy/material co-production)
Research Interests
  • 1. Studies on pyrolysis, reforming and gasification of carbonaceous resources toward establishment of sustainable carbon cycle chemistry
    1.1. Analysis/modeling of detailed chemical kinetics, simulation of conversion of carbonaceous resources and reactor design
    1.2. Development of sequential thermochemical conversion of carbonaceous resources for coproduction
    1.3. Thermochemical conversion of carbonaceous resources utilizing nano-sized and sun-nano-sized spaces
    1.4. Low temperature gasification of solid fuel with maximized chemical energy recovery
    1.5. Coproduction of power and secondary (upgraded) carbon resource from fossil fuels and biomass
    1.6. Smart chemical production system based on biomass utilization and conversion
    1.7. Development of method for producing high-quality carbonized solids and carbon materials from low-rank coal and biomass
    1.8. Development of pyrolysis and catalytic pyrolysis methods for chemicals production
    keyword : Carbon resource conversion, coproduction, carbon neutral/negative, hydrogen, chemical production, gasification, pyrolysis, carbonization, process design, reaction mechanism, reaction kinetics, fossil fuels,biomass
Current and Past Project
  • Design of Biomass Pyrolysis Process for Production of Tar-free Active Biochar
  • Production of metallurgical coke with high reactivity and strength from low rank carbonaceous solid
  • Main purpose of this project is (1) to clarify characteristics of primary pyrolysis of pulverized coal and subsequent secondary reactions of nascent char and volatiles in CO2-containing atmosphere at temperature ranging from 1000 - 1300 degree-C and (2) to predict such characteristics by a model considering detailed chemical kinetics and mechanism.
  • This work aims at experimental proof of biomass pyrolysis at temperature up to 500 C with full recycling of heavy oil and resulting selective production of light-oil, in other words, that of bio-oil that contains no or little evaporation residue.
  • Development of advanced methods for converting low rank solid fuels into syngas, feedsctok for coke, binder and specialty chemicals by catalytic/noncatalytic reaction processes in sub
  • Main purpose of this project is to develop a process that is applicable to conversion of various types of woody/herbaceous biomass resources into clean carbonized solids (biochar) and tar-free/H2-rich syngas by means of Pyrocoking method.
  • This project aims to develop elemental technologies such as low temperature coal gasification, novel reactor systems with high-density/high-velocity particles circulation, chemical recuperation of heat from gas-turbines/SOFC, which are indispensable to the next-generation coal gasification combined cycle power generation.
Academic Activities
1. Hiromi Ishii, Tomoya Hayashi, Hiroaki Tada, Katsuhiko Yokohama, Ryuhei Takashima, Jun-Ichiro Hayashi, Critical assessment of oxy-fuel integrated coal gasification combined cycles, Applied Energy, 10.1016/j.apenergy.2018.10.021, 233-234, 156-169, 2019.01, Critical assessment was performed for a type of oxy-fuel integrated coal gasification combined cycles (IGCC) that was comprised of proven components. A type of two-stage entrained-flow gasifier consisting of combustor and reductor sections was simulated by a one-dimensional model that has been proven through application to gasifiers of industrial scales. It was successfully reproduced on Aspen Plus® and integrated together with the other components into a commercial-scale IGCC system. The oxidizing agents were not only O2 and CO2 (carrier gas for conveying the coal) but also additional CO2 or CO2 /H2 O, that was required to suppress hydrocarbons formation and maintain the combustor temperature allowing molten ash to have sufficiently low viscosity. The net thermal efficiency was predicted as a function of steam/coal mass ratio (S/C) within a range of 0–0.4. Increasing S/C up to 0.2 increased the cold gas efficiency slightly but resulted in decrease in the net thermal efficiency of the system. This was mainly due to the extraction of steam from the high pressure steam turbine exhaust, causing loss of power output. Resulting in lower cold gas efficiency due to higher oxygen ratio, higher moisture content of the pulverized coal gave higher net thermal efficiency due to less steam consumption for coal drying. The net efficiency was optimized at approximately 39% on a higher-heating-value basis without steam feeding, which was higher by 6–7 points than that for conventional IGCC with oxygen-blown gasification combined with CO2 recovery..
2. Kudo Shinji, Yasuyo Hachiyama, Yuka Takashima, Junya Tahara, Idesh Saruul, Koyo Norinaga, Hayashi Jun-ichiro, Catalytic Hydrothermal Reforming of Lignin in Aqueous Alkaline Medium, Energy & Fuels, 10.1021/ef401557w, 28, 1, 76-85, 2014.01, This paper proposes catalytic hydrothermal reforming (CHTR) for producing substitute natural gas (SNG) directly from a lignin in aqueous alkaline media, which can fully dissolve the lignin but stabilize it, lowering the reactivity toward water. Among catalysts preliminarily tested, activated-carbon-supported ruthenium (Ru/AC) catalysts showed the highest activity in terms of reduction of the total organic carbon concentration (TOC) in the aqueous solution. CHTR of a lignin was performed employing a 5000 ppm TOC solution of 0.1 M Na2CO3 in a continuous reactor. The presence of Na2CO3 in the solution enabled delivery of the lignin, which is poorly soluble in water, to the reactor as well as suppression of char formation during CHTR. A Ru/AC showed its ability to maintain 98.6% conversion of the lignin at 350 °C even under the alkaline environment for a duration of at least 10 h, with colorless effluent liquid containing 70 ppm TOC of organic carbon. A low content of Ru in the Ru/AC resulted in an insufficient yield of gas because of the deposition of a portion of the lignin as coke over the catalyst, while 20 wt % Ru was enough for the full conversion into gas composed mainly of CH4, with cold gas efficiency (CGE) of 100.4% on a higher heating value (HHV) basis. The resulting aqueous solution of Na2CO3 was ready to be reused for CHTR after removal of carbonate ions derived from the lignin by aeration..
3. Hayashi Jun-ichiro, Kudo Shinji, Hyun-Seok Kim, Koyo Norinaga, Sou Hosokai, Koichi Matsuoka, Sou Hosokai, Low temperature Gasification of Biomass and Lignite: Consideration of Key Thermochemical Phenomena, Rearrangement of Reactions, and Reactor Configuration, Energy & Fuels, 10.1021/ef401617k , 28, 1, 4-21, 2014.01, This paper discusses gasification of solid fuels, such as biomass and lignite, at temperatures well below 1000 °C, which potentially realizes a loss of chemical energy (LCE) smaller than 10% but encounters difficulty in fast and/or complete solid-to-gas conversion in conventional reactor systems. First, key thermochemical and catalytic phenomena are extracted from complex reactions involved in the gasification. These are interactions between intermediates (i.e., volatiles and char), catalysis of inherent and extraneous metallic species, and very fast steam gasification of nascent char. Second, some ways to control the key phenomena are proposed conceptually together with those to rearrange homogeneous/heterogeneous reactions in series/ parallel. Third, implementation of the proposed concepts is discussed assuming different types of gasifiers consisting of a single- fluidized bed, dual-fluidized bed, triple-bed circulating fluidized bed, and/or fixed (moving) bed. The triple-fluidized bed can attain gasification with a LCE as small as 10% by introducing enhancement and/or elimination of the key phenomena and another way to recuperate heat from gas turbine and/or fuel cells (i.e., power generators in gasification combined cycles) into chemical energy of fuel gas. A particular type of fixed-bed gasifier is proposed, which is separated from a pyrolyzer to realize not only control of the key phenomena but also temporal/spatial rearrangement of exothermic and endothermic reactions. This type of gasifier can make a LCE smaller than 4%. Even a conventional single-fluidized bed provides simple and effective gasification, when tar-free/reactive char is used as the fuel instead of parent the one and contributes to a novel integrated gasification fuel cell combined cycles with a theoretical electrical efficiency over 80%..
1. Li Chen, Rei Nakamoto, Shinji Kudo, Shusaku Asano, Jun-ichiro Hayashi, Biochar-Assisted Water Electrolysis, 7th Sino-Australian Symp. Advanced Coal/Biomass Utilisation Technologies, 2019.12, This study has experimentally proven an approach to integrate electric energy and chemical energy of biomass into chemical energy of hydrogen by biochar-assisted water electrolysis (BAWE). This type of electrolysis, in other words, electrochemical gasification, consists of hydrogen formation at the cathode and biochar oxidation at the anode, instead of O2 formation. Different from traditional gasification of biochar, BAWE is operated at a temperature below 100 °C and normal pressure. Linear sweep voltammetry showed that the electrolysis of acidified water, when suspended with biochar, occurred at an interelectrode potential as low as 0.5 V, which was much smaller than 1.23 V, the standard potential to split water into hydrogen and oxygen at 25 °C. The performance of biochar depended significantly upon the carbonization temperature for its preparation. It was found that 850 °C was the best carbonization temperature that provided an optimum combination of specific surface area and carbon-type distribution. It was revealed by continuous BAWE that the formation of O-containing functional groups on the biochar surface was predominant over CO2 formation at the anode, while H2 was formed obeying stoichiometry at the cathode. Accumulation of the O-containing groups on the biochar surface decreased its electrochemical reactivity, slowing the electrolysis. Thermal treatment at 850 °C removed the major portion of O-containing groups from the spent biochar, fully recuperating its electrochemical reactivity. CO2 gasification enhanced the biochar activity, and its effect went far beyond the heat treatment. On the basis of the above-mentioned characteristics of BAWE, its combination with CO2 gasification as the biochar recuperator as well as syngas producer is proposed..
2. Jun-ichiro Hayashi, Grand design of coal/biomass conversion into power and chemicals with
carbon-neutral/negative nature
, 9th International Symposium on Coal Combustion, 2019.07.
3. Zayda Faizah Zahara, Shinji Kudo, Ashik U.P.M., Koyo Norinaga, Jun-ichiro Hayashi, CO2 gasification of sugarcane bagasse: Quantitative understanding of kinetics and catalytic roles of inherent metallic species, 6th Sino-Australian Symposium on Advanced Coal and Biomass Utilization Technologies, 2017.12.
4. Hayashi Jun-ichiro, Kudo Shinji, Hyunseok Kim, Koyo Norinaga, Koichi Matsuoka, Sou Hosokai, Low Temperature Gasification of Biomass and Lignite: Consideration of Key Thermochemical Phenomena, Rearrangement of Reactions, and Reactor Configuration, 4th (2013) Sino-Australian Symposium on Advanced Coal and Biomass Utilization Technologies, 2013.12.
5. Kudo Shinji, Yasuyo Hachiyama, Yuka Takashima, Junya Tahara, Idesh Saruul, Hayashi Jun-ichiro, Catalytic Hydrothermal Reforming of Lignin in Aqueous Alkaline Medium, 4th (2013) Sino-Australian Symposium on Advanced Coal and Biomass Utilization Technologies, 2013.12.
6. Hayashi Jun-ichiro, Production of metallurgical coke from lignite and biomass, Carbon Saves the Earth 2013 (CSE2013), 2013.11.
Membership in Academic Society
  • The Society of Chemical Engineers, Japan
  • The Iron and Steel Institute of Japan (ISIJ)
  • The Japan Institute of Energy
  • Best Paper Award in The Second International Symposium on Gasification and Its Application (iSGA 2011) Coproduction of Clean Syngas and Iron From Woody Biomass and Natural Goethite Ore. Shinji Kudo, Keigo Sugiyama, Koyo Norinaga, Chun-Zhu Li, Tomohiro Akiyama, Jun-ichiro Hayashi
  • The following paper has been recognised in the "Top-75 most cited articles" as published in the IChemE journals 2006 - 2009:

    Gasification of low-rank solid fuels with thermochemical energy recuperation for hydrogen production and power generation
    J.-I. Hayashi S. Hosokai N. Sonoyama
    Process Safety and Environmental Protection, Volume 84, Issue 6 B (2006), Pages 409-419
  • Prof. Jun-ichiro Hayashi (Kyushu University) and Dr. Hiroyuki Uesugi (Biocoke Lab., Co. Ltd) have developed a technology for effectively converting biomass into tar-free gaseous and solid fuels, which is named Pyrocoking. The primary step of Pyrocoking is low-temperature rapid pyrolysis of biomass which produces the tar-free solid fuel (Biochar) and pyrolysis gas. The pyrolysis gas that contains tar vapor with a concentration as high as 900,000 mg/Nm3-dry is then reformed over a type of nanoporous soild such as Biochar, active alumina and nanoporous natural iron oxide. The tar vapor is quickly decomposed into light gases and carbon deposit (Biocoke). Biocoke can be used as smokeless clean solid fuel in ways similar to that for Biochar. Moreover, Biocoke-laden partially reduced iron ore is available as a type of raw material in local steel industry. Clean gas from the reforming contains tar with a concentration below 100 mg/Nm3-dry and directly available in IC engine cogeneration.
    Thus, Pyrocoking produces Biomass-derived carbonized solids and power/heat simultaneously.
  • Formation of Carbon Nano-Capsules during Rapid Pyrolysis and Subsequent Steam Gasification of Brown Coal
  • Analytical Studies on Degradation of Coal Macromolecules and Development of a Lattice Model
  • Modeling of Effect of Volatile Matter Cloud on Heterogeneous Ignition of Single Coal Particles
  • Studies on methods for tracing and controlling of flash coal pyrolysis
Educational Activities
1. Lecture of the following subjects:
(a) Advanced Chemical Reaction Engineering (Dept. Interdisciplinary Engineering Sciences)
(b) Industrial Chemistry II (Inorganic Chemistry, Dept. Chem. Eng. faculty of Engineering)
(c) Physical Chemistry (Advanced Graduate Program in Global Strategy for Green Asia)
(d) Advanced Chemical Reaction Engineering (Advanced Graduate Program in Global Strategy for Green Asia)
(e) Others
2. Supervision of master/PhD-course students through research
3. Supervision of research students (including those from other universities)
4. Core member of a Kyushu University Global COE Program: Novel Carbon Resource Sciences
5. Vice-Coordinator of a Kyushu University Leading Graduate School Program: Advanced Graduate Program in Global Strategy for Green Asia
Professional and Outreach Activities
• Proposals of novel concept of carbonaceous resource conversion and processes/systems, national projects (including incubation ones)
• Collaboration mainly with Asian/Oceanian universities/institutes toward development of novel processes for biomass/coal conversion.