期刊
CATALYSIS TODAY
卷 66, 期 2-4, 页码 381-387出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0920-5861(00)00634-9
关键词
cinnamaldehyde; selective hydrogenation; kinetics; Pt/C catalysts
For the isothermal hydrogenation of cinnamaldehyde over Pt/C/monolithic catalysts three kinetic models have been evaluated, each model based on different sets of assumptions. A single-site and a two-site model with the surface reactions as rate-controlling steps were unable to describe the experimental data satisfactorily, while a single-site model with adsorption, surface reactions, and desorption all rate controlling could describe the experimental data adequately. This model includes apparent direct reaction steps from reactant to various end-products, due to the competition between desorption and subsequent conversion of intermediates at the catalyst surface. The selectivity to the unsaturated alcohol increases with increasing reactant concentration, which is ascribed to a change in adsorption mode, possibly due to some assembling phenomena of the reactant at the catalyst surface. (C) 2001 Elsevier Science B.V. All rights reserved.
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