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Mechanism for the oxidation of carbon monoxide on supported catalysts. I. Low temperature oxidation of carbon monoxide of Pd/. gamma. -Al/sub 2/O/sub 3/

G.N. Kakniashvili, David Dulin, E. G. ISAEVA, Yu.A. Mishchenko

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Abstract

A study was carried out on the mechanism of the catalytic oxidation of CO on Pd/..gamma..-Al/sub 2/O/sub 3/ at less than or equal to 150/sup 0/C using labelled oxygen and thermal desorption analysis. The reaction was found to proceed by the reaction of the intermediate complexes of CO molecules with the Al/sub 2/O/sub 3/ hydroxyl groups. A combined mechanism was proposed for the formation and decomposition of carboxyl species, in which adsorbed oxygen reoxidizes the reduced palladium atoms and provides for decomposition of the carboxyl species with the formation of CO/sub 2/ and regeneration of the OH groups.

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What this paper is about

A study was carried out on the mechanism of the catalytic oxidation of CO on Pd/..gamma..-Al/sub 2/O/sub 3/ at less than or equal to 150/sup 0/C using labelled oxygen and thermal desorption analysis. The reaction was found to proceed by the reaction of the intermediate complexes of CO molecules with the Al/sub 2/O/sub 3/ hydroxyl groups. A combined mechanism was proposed for the formation and decomposition of carboxyl species, in which adsorbed oxygen reoxidizes the reduced palladium atoms and provides for decomposition of the carboxyl species with the formation of CO/sub 2/ and regeneration of the OH groups.

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Available abstract

A study was carried out on the mechanism of the catalytic oxidation of CO on Pd/..gamma..-Al/sub 2/O/sub 3/ at less than or equal to 150/sup 0/C using labelled oxygen and thermal desorption analysis. The reaction was found to proceed by the reaction of the intermediate complexes of CO molecules with the Al/sub 2/O/sub 3/ hydroxyl groups. A combined mechanism was proposed for the formation and decomposition of carboxyl species, in which adsorbed oxygen reoxidizes the reduced palladium atoms and provides for decomposition of the carboxyl species with the formation of CO/sub 2/ and regeneration of the OH groups.

Key concepts: Carbon monoxide, Chemistry, Catalysis, Decomposition, Oxygen, Inorganic chemistry, Reaction mechanism, Desorption

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