The decomposition of water on the CO- or H2-reduced indium oxide.
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概要
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The reduction of In<SUB>2</SUB>O<SUB>3</SUB> by H<SUB>2</SUB> or CO and the reoxidation of the reduced oxide by water, accompanying the formation of hydrogen, have been investigated at ≥673 K. The reduction of In<SUB>2</SUB>O<SUB>3</SUB> and the decomposition of water have been expressed by the forward reaction and the backward reaction respectively of this equation: In<SUB>2</SUB>O<SUB>3</SUB>(s)+<I>x</I>H<SUB>2</SUB>(g)\rightleftarrowsIn<SUB>2</SUB>O<SUB>3−<I>x</I></SUB>(s)+<I>x</I>H<SUB>2</SUB>(g), where In<SUB>2</SUB>O<SUB>3−<I>x</I></SUB>(s) is a mixture of indium metal and In<SUB>2</SUB>O<SUB>3</SUB>. Surface oxygen atoms of fresh In<SUB>2</SUB>O<SUB>3</SUB> are easily removed by H<SUB>2</SUB>- or CO-reduction at 673 K, but they can not be reformed by oxidation with water. This explains the observation that the quantity of hydrogen produced in the oxidation step was somewhat deficient compared to that consumed by the reduction. The maximum rate of the decomposition of water is observed when the oxide has been reduced up to a 50% reduction-level. However, an excessive reduction (greater than 85%) results in a sharp decrease in the rate of the decomposition of water, probably because of the isolation of metallic indium from the host In<SUB>2</SUB>O<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Otsuka Kiyoshi
Department Of Applied Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Techno
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Morikawa Akira
Department Of Chemistry Faculty Of Science Nagoya University
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Yasui Takao
Department Of Applied Chemistry Graduate School Of Engineering Nagoya University
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Morikawa Akira
Department of Chemical Engineering, Tokyo Institute of Technology
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