Open AccessDOI
Reactions on oxide catalysts—kinetics and mechanism of dehydrogenation and decarboxylation
K. Balasubramanian,J. C. Kuriacose +1 more
- Vol. 93, Iss: 3, pp 357-372
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TLDR
In this paper, a review of the mechanistic studies on metal oxide catalysts is presented, showing that the catalytic ketonization is a bimolecular process on the surface of the catalyst.Abstract:
Some of the mechanistic studies on dehydrogenation, dehydration and decarboxylation over metal oxide catalysts are reviewed. The type of activity of a catalyst is determined by the nature of the surface-substrate interaction, the same catalyst giving rise to different relative activities depending on the substrate. In addition to dehydrogenation and dehydration reactions many oxide catalysts promote hydrogen transfer reactions too. In the mixed oxide systems the interfaces between the pure oxides as well as interfaces arising from new phases formed by the interaction of component oxides are active regions. In the ketonization of acids the same active sites as those effective for the decomposition of alcohols are involved. The type of the intermediate depends on the conditions of reaction, the most important being the temperature. The technique of competitive reactions has been used to establish that the catalytic ketonization is a bimolecular process on the surface of the catalyst.read more
References
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Journal ArticleDOI
Chemistry of the surface and the activity of alumina-silica cracking catalyst
Journal ArticleDOI
Preparation of small Au-Pd particles on silica
Y.L. Lam,Michel Boudart +1 more
TL;DR: In this paper, small Au-Pd particles 2.0 to 4.5 nm in diameter were prepared by ion exchange of [Au(en) 2 ] 3+ and [Pd(NH 3 ) 4 ] 2+ with surface protons of silica gel to form a precursor, which was subsequently reduced in dihydrogen.
Journal ArticleDOI
Studies on the surface interaction of acetic acid on iron oxide
J.C. Kuriacose,S.S. Jewur +1 more
TL;DR: In this paper, the activation energy of the reaction depends on the region of temperature in which the reaction is carried out, indicating the dependence of the mechanism of ketonization on temperature.
Journal ArticleDOI
Studies on the ketonization of acetic acid on chromia: II. The surface reaction
R. Swaminathan,J.C. Kuriacose +1 more
TL;DR: In this paper, a mechanism for the surface reaction of acetic acid on chromia is suggested and discussed based on a comparison of the energies of activation and the previously established fact that both the dehydration and dehydrogenation activity of chromia are required for the ketonization reaction.
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