Substituent effects in heterogeneous catalysis. IV. Adsorption estimations during competitive hydrogenation of cyclohexanone and its 2-alkyl derivatives.
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概要
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Cyclohexanone (<B>1</B>) and its 2-alkyl derivatives (2-methyl-, 2-ethyl-, and 2-propylcyclohexanone (<B>2m</B>, <B>2e</B>, and <B>2p</B>)) were hydrogenated both individually and competitively in pairs (<B>1</B>+<B>2</B>) in cyclohexane using Ru/Al<SUB>2</SUB>O<SUB>3</SUB>, Rh/Al<SUB>2</SUB>O<SUB>3</SUB>, and Pt/Al<SUB>2</SUB>O<SUB>3</SUB> as catalysts. For all the catalysts, the reaction rates in competitive reaction decreased in the sequence, <B>l</B>>><B>2m</B>><B>2e</B>><B>2p</B>, while those in individual reaction were in the relation, <B>1</B>><B>2m</B>≈<B>2e</B>≈<B>2p</B>. By the analysis of these kinetic data, the relative values of adsorption equilibrium constants have been estimated for <B>2m</B>, <B>2e</B>, and <B>2p</B>. These experimental values are in good agreement with the theoretical ones which have been derived on the basis of statistical mechanics using an adsorption model characterized by immobile adsorption of the substrate ketones.
- 公益社団法人 日本化学会の論文
著者
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Chihara Teiji
The Institute of Physical and Chemical Research
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Tanaka Kazunori
The Institute of Physical and Chemical Research
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