Application of transient methods in three-phase catalysis: hydrogenation of a dione in a catalytic plate column

The continuous enantioselective hydrogenation of 1-phenyl-1,2-propanedione was investigated in fixed-bed reactor at 25 °C and 5 bar H 2 over a knitted Pt silica fibre catalyst modified with (−)-cinchonidine. Transient data were quantitatively modelled based on the reaction mechanism which assumes tw...

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Bibliographic Details
Published in:Catalysis today 2003-04, Vol.79, p.383-389
Main Authors: Toukoniitty, Esa, Wärnå, Johan, Salmi, Tapio, Mäki-Arvela, Päivi, Murzin, Dmitry Yu
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
Gas chromatograph
General and physical chemistry
Peclet number
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Transient kinetic
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Summary:The continuous enantioselective hydrogenation of 1-phenyl-1,2-propanedione was investigated in fixed-bed reactor at 25 °C and 5 bar H 2 over a knitted Pt silica fibre catalyst modified with (−)-cinchonidine. Transient data were quantitatively modelled based on the reaction mechanism which assumes two parallel and tilted adsorption modes for the modifier and two distinct adsorption modes for 1- and 2-carbonyls, each of them requiring different number of surface sites. A dynamic axial dispersion model described the tube reactor with the Peclet number estimated from the separate impulse experiments carried out with an inert tracer. The modelling revealed that inclusion of sorption dynamics of components is of critical importance for the adequate description of transient data.
ISSN:0920-5861
1873-4308
DOI:10.1016/S0920-5861(03)00067-1