Photocatalyzed isomerization of butenes over metal sulfides. High photocatalytic activity and its origin.
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概要
- 論文の詳細を見る
Photocatalytic activity of CdS and ZnS for the <I>cis</I>-<I>trans</I> isomerization of 2-butene is much higher than that of TiO<SUB>2</SUB> and ZnO, though the double bond shift isomerization to 1-butene hardly proceeds in contrast with the case of the oxides. The addition of O<SUB>2</SUB> or NO molecules leads to the remarkable inhibition of photocatalyzed isomerization of 2-butene, but not to the complete inhibition. Water vapor enhanced the photocatalyzed isomerization. From these results together with the ESR measurements before and after UV irradiation of the sulfide catalyst either in the presence or in the absence of butene, the following conclusions emerge: sulfur radicals such as \dotS<I><SUB>n</SUB></I>, which are produced by the hole trapping by lattice S<SUP>2−</SUP> ions and/or sulfur clusters existing in the catalyst inherently, play a significant role in the weakening of the C=C double bond of 2-butene via the interaction with the molecules; the stability of such sulfur radicals results in the much higher photocatalytic activity of CdS and ZnS catalysts as compared with that of metal oxide catalysts.
- 公益社団法人 日本化学会の論文
著者
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Anpo Masakazu
Department Of Applied Chemistry Colledge Of Engineering University Of Osaka Prefecture
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Matsumoto Atsushi
Department Of Electric Engineering Hiroshima Institute Of Technology
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Kubokawa Yutaka
Department of Applied Chemistry College of Engineering University of Osaka Prefecture
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Kodama Sukeya
Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
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