Preparation of solid catalysts for vapor-phase decomposition of carbonyl sulfide.
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概要
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The vapor-phase catalytic decomposition of COS (COS→CO+1/<I>x</I>S<I><SUB>x</SUB></I> and 2COS→CO<SUB>2</SUB>+CS<SUB>2</SUB>) has been mechanistically investigated so as to prepare solid catalysts which are active and selective for the first reaction. The comparison of the catalytic activity and selectivity of a series of Al<SUB>2</SUB>O<SUB>3</SUB> catalysts with their acid-base properties and the different behavior of these two catalytic decomposition reactions in the poisoning of an Al<SUB>2</SUB>O<SUB>3</SUB> catalyst with SO<SUB>2</SUB> demonstrate that electron-donating sites catalyze the first reaction whereas Lewis acidic sites do so the second reaction. CaO catalysts are prepared by thermal decomposition of CaCO<SUB>3</SUB> at elevated temperatures and their catalytic activity is compared with their amount of electron-donating sites. The greatest catalytic activity and selectivity for the first reaction(yield of CO+S<I><SUB>x</SUB></I>=21.4%, selectivity=80.2% at 873 K) are obtained over CaO catalyst prepared at 1123 K which has the greatest electron-donating ability. These values of the yield and selectivity to CO+S<I><SUB>x</SUB></I> are much greater than those obtained over Al<SUB>2</SUB>O<SUB>3</SUB> catalysts.
著者
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Akimoto Masamichi
Department Of Applied Chemistry And Biotechnology Faculty Of Engineering Niigata Institute Of Techno
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Niiyama Hiroo
Department of Chemical Engineering and International Cooperation Center for Science and Technology, Tokyo Institute of Technology
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Suto Hirotoshi
Department of Chemical Engineering, Tokyo Institute of Technology
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