Kyushu University Academic Staff Educational and Research Activities Database
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Haruno Murayama Last modified date:2019.06.20



Other Organization


E-Mail
Phone
092-802-4141
Fax
092-802-4140
Academic Degree
Ph.D. in Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Physical chemistry, Catalysis chemistry, X-ray structure analysis
Total Priod of education and research career in the foreign country
02years00months
Research
Research Interests
  • Investigation of electrolyte for lithium-ion batteries
    keyword : lithium-ion batteries, electrolyte, oxidation reaction
    2015.04~2017.10.
  • Preparation, structure analysis, and reaction of heterogeneous catalyst
    keyword : Catalysis, metal nano particles
    2015.03~2017.03.
Academic Activities
Papers
1. Haruno Murayama, Yusuke Yamamoto, Misaki Tone, Takayuki Hasegawa, Moemi Kimura, Tamao Ishida, Atsuko Isogai, Tsutomu Fujii, Mitsutaka Okumura, Makoto Tokunaga, Selective adsorption of 1,3-dimethyltrisulfane (DMTS) responsible for aged odour in Japanese sake using supported gold nanoparticles, Scientific reports, 10.1038/s41598-018-34217-w, 8, 1, 2018.12, Gold (Au) nanoparticles (NPs) supported on SiO
<sub>2</sub>
(Au/SiO
<sub>2</sub>
) were prepared by a practical impregnation method and applied as an adsorbent for 1,3-dimethyltrisulfane (DMTS), which is responsible for an unpleasant odour in drinks, especially Japanese sake. Compared with a conventional adsorbent, activated carbon, Au/SiO
<sub>2</sub>
selectively reduced the DMTS concentration in Japanese sake without decreasing the concentrations of other aromatic components. DFT calculations revealed that the selective adsorption of DMTS occurred through the formation of a stable intermediate. The size of the supported Au NPs was controlled by the preparation conditions and determined from TEM observations and XRD measurements, and the size was ranged from 2.4 nm to 30 nm. Au/SiO
<sub>2</sub>
having Au NPs with a diameter of 2.4 nm adsorbed DMTS the most efficiently. Smaller Au NPs showed better DMTS adsorption capabilities because larger amounts of Au atoms were exposed on their surfaces in the size range of this study. Langmuir-type monolayer adsorption and one-to-one binding of Au–S are proposed to occur based on an adsorption isotherm experiment. Even though significant differences of the fruity aroma score were not observed in the sensory evaluation between Au/SiO
<sub>2</sub>
and activated carbon for this less aromatic Japanese sake, Au/SiO
<sub>2</sub>
selectively decreased the DMTS concentration in the instrumental analysis..
2. Haruno Murayama, Takayuki Hasegawa, Yusuke Yamamoto, Misaki Tone, Moemi Kimura, Tamao Ishida, Tetsuo Honma, Mitsutaka Okumura, Atsuko Isogai, Tsutomu Fujii, Makoto Tokunaga, Chloride-free and water-soluble Au complex for preparation of supported small nanoparticles by impregnation method, Journal of Catalysis, 10.1016/j.jcat.2017.07.002, 353, 74-80, 2017.01, A novel simple and easy impregnation method for preparation of small gold (Au) nanoparticle (NP) catalysts (< 3 nm) deposited on various supports including silica, which is difficult to be applied for conventional methods, has been developed. Chloride-free and water-soluble precursor, Au complexes coordinated with β-alanine, were successful for the preparing Au NPs, which exhibited an average diameter less than 3 nm. Thermal behavior of the Au complex was investigated by TG-DTA and in situ XAFS. XAFS analyses and DFT calculations revealed a molecular structure of the Au complex to be square-planar coordination structure and mononuclear complex of Au3+. Lower decomposition and reduction temperature of the chloride-free Au complex prevented Au atoms from aggregating and from following growth of Au particles. The prepared Au/SiO2 showed high selectivity for hydrogenation of 1-nitro-4-vinylbenzene into 1-ethyl-4-nitorobenzene and good performance for removal of unpalatable aroma by means of adsorption of polysulfide molecules..
3. Koji Kitada, Haruno Murayama, Katsutoshi Fukuda, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi, Eiichiro Matsubara, Factors determining the packing-limitation of active materials in the composite electrode of lithium-ion batteries, Journal of Power Sources, 10.1016/j.jpowsour.2015.09.105, 301, 11-17, 2016.01.
4. Haruno Murayama, Koji Kitada, Katsutoshi Fukuda, Akio Mitsui, Koji Ohara, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi, Eiichiro Matsubara, Spectroscopic X-ray diffraction for microfocus inspection of Li-ion batteries, Journal of Physical Chemistry C, 10.1021/jp5029273, 118, 36, 20750-20755, 2014.09.
Membership in Academic Society
  • The Chemical Society of Japan
  • Catalysis Society of Japan