Collect. Czech. Chem. Commun. 1993, 58, 791-797

Support Effect in Carbon Oxide(s) Hydrogenation on Cu-Cr Supported Catalysts

Zahia Rassoula, Joël Barraultb and Mohamed M. Bettahara

a Laboratoire de Chimie du Gaz Naturel, Institut de Chimie, U.S.T.H.B., BP 32, Bab-Ezzouar Alger, Algerie
b Laboratoire de Catalyse en Chimie Organique, URA-CNRS 350, ESIP, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France


Reducibility, adsorptive properties and catalytic properties of Cu-Cr supported on TiO2, ZnO and Al2O3 were studied in carbon oxide(s) hydrogenation. ZnO is the best retardant for the reduction of copper, stabilizing more strongly Cu+ species and retaining great amounts of H2 during the reduction of the calcined precursors. A strong support effect is observed for the CO2/H2 reaction and good correlations are established between catalytic activities, Cu+ species present in the reduced state and H2 adsorption and storage. ZnO is the most active support but not the most selective one for this reaction. The support effect is not so important for the CO/H2 reaction, but ZnO supported catalyst is again the most active and also the most selective.