Deoxygenation of benzoic acid on metal oxides: 2. Formation of byproducts

Benzene, benzophenone, toluene and benzylalcohol are byproducts in the selective deoxygenation of benzoic acid to benzaldehyde on ZnO and ZrO 2. In this paper, the pathways to the byproducts are discussed and a complete overview of the reaction network is presented. Benzene and benzophenone are prod...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2002-05, Vol.231 (1), p.17-26
Main Authors: de Lange, M.W, van Ommen, J.G, Lefferts, L
Format: Article
Language:English
Subjects:
Benzaldehyde
Benzoic acid
Benzylalcohol
Catalysis
Catalytic reactions
Chemistry
Deoxygenation
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
ZnO, ZrO 2
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Summary:Benzene, benzophenone, toluene and benzylalcohol are byproducts in the selective deoxygenation of benzoic acid to benzaldehyde on ZnO and ZrO 2. In this paper, the pathways to the byproducts are discussed and a complete overview of the reaction network is presented. Benzene and benzophenone are products of the decomposition of the strongly adsorbed benzoic acid at elevated temperature. Toluene is formed by the deoxygenation of benzaldehyde at oxygen vacancy sites. Direct hydrogenation of benzaldehyde yields benzylalcohol. Selectivity to byproducts is not only determined by the reaction temperature, but also by the degree of surface reduction and the difference in adsorption strength between reactant and product. At temperatures 95%). Higher temperatures induce decomposition of the benzoate layer into benzene and more importantly enhance the degree of reduction of the catalyst, which results in the formation of toluene from benzaldehyde.
ISSN:0926-860X
1873-3875
DOI:10.1016/S0926-860X(01)00702-5