日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 79, No. 3 (2015),
pp. 107-111

In-Situ XAS for Niobium Oxide Catalyst on Hydrogen Absorption and Desorption of Magnesium

Toru Kimura1, Hiroki Miyaoka2, Nobuko Hanada3 and Takayuki Ichikawa1

1Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima 739-8530
2Institute for Sustainable Sciences and Development, Hiroshima University, Higashi-Hiroshima 739-8530
3Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba 305-8573

Abstract:

The variation of the niobium (Nb) oxide catalyst during hydrogen absorption and desorption reactions was investigated by in-situ X-ray absorption spectroscopy (XAS). Results indicated that H2 was easily dissociated on the catalyst because the hydrogen absorption kinetics was significantly improved, and then the hydrogen atoms were diffused through inside of the catalyst. Thus, the catalytic mechanism of Nb oxides is different from that of conventional metal catalysts, in which the dissociated H is moved on the surface of catalyst. [doi:10.2320/jinstmet.JC201410]


(Received 2014/10/14)

Keywords:

hydrogen storage materials, magnesium, catalyst, in-situ X-ray absorption spectroscopy (XAS)


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