Preparation of Pd/AC Catalyst by Ion Exchange
A. Cabiac1, G. Delahay1, R. Durand1, P. Trens1, B. Coq1 and D. PlГ©e2
1Laboratoire de MatГ©riaux Catalytiques et Catalyse en Chimie Organique, UMR 5618-CNRS-ENSCM, Institut Charles Gerhardt FR 1878, 8, rue de l'Ecole Normale, Montpellier CEDEX 5 (France)
2Groupement de Recherches de Lacq - ARKEMA, rte de Bayonne, 64170 LACQ (France)
E-mail: gerard.delahay@enscm.fr
Pages: 553-558
Abstract
By choosing appropriate liquid oxidizing treatment, the carbonaceous surface of an activated carbon (AC) can be functionalised with carboxylic groups in a broad range of content. These carboxylic groups are necessary functions, in order to disperse, perfectly, palladium cations through exchange reactions: H+/Pd2+ or H+/Pd(OH)+. Reduction in liquid phase of a 4 mass %Pd/AC whose carbonaceous surface was previously oxidized by NaOCl leads to palladium particles with a particle size of 1.5 nm which are much smaller than Pd particles obtained from a 4 mass % Pd/AC whose carbon surface was not oxidized. The well dispersed catalyst was tested in hydrogenation of cinnamaldehyde and exhibits quite a high hydrogenation efficiency as compared to activities reported in the literature.
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