Palladium-silver sol-gel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene III. Kinetics and reaction mechanism

Heinrichs, Benoît; Schoebrechts, Jean-Paul; Pirard, Jean-Paul

doi:10.1006/jcat.2001.3188

Article (Scientific journals)

Palladium-silver sol-gel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene III. Kinetics and reaction mechanism

Heinrichs, Benoît; Schoebrechts, Jean-Paul; Pirard, Jean-Paul

2001 • In Journal of Catalysis, 200 (2), p. 309-320

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https://hdl.handle.net/2268/27168

DOI
10.1006/jcat.2001.3188

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Keywords :

1,2-dichloroethane; Pd-Ag alloys; kinetics; reaction mechanism; hydrodechlorination

Abstract :

[en] The kinetics of selective hydrodechlorination of 1,2-dichloro-ethane into ethylene over a Pd-Ag/SiO2 catalyst is studied. Kinetic data at 573, 596, and 647 K have been obtained by means of experimental designs in the space of the partial pressures of the four components influencing kinetics, that is, 1,2-dichloroethane, hydrogen, ethylene, and hydrogen chloride. One model among the numerous ones examined allows us to represent correctly the experimental data. Ii: corresponds to the following mechanism: dechlorination of 1,2-dichloroethane into ethylene occurs on silver through dissociative adsorption with successive breaking of the two C-Cl bonds and desorption of C2H4. Thanks to its activation power of hydrogen by dissociative chemisorption, palladium present at the surface of the alloy supplies hydrogen atoms for regeneration of the chlorinated silver surface into metallic silver. The presence of hydrogen adsorbed on Pd also causes the undesired ethylene hydrogenation leading to a loss of olefin selectivity. (C) 2001 Academic Press.

Disciplines :

Chemical engineering

Author, co-author :

Heinrichs, Benoît ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée

Schoebrechts, Jean-Paul

Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée

Language :

English

Title :

Palladium-silver sol-gel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene III. Kinetics and reaction mechanism

Publication date :

2001

Journal title :

Journal of Catalysis

ISSN :

0021-9517

eISSN :

1090-2694

Publisher :

Academic Press, San Diego, United States - California

Volume :

200

Issue :

Pages :

309-320

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 29 October 2009

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