J. Phys. IV France 123 (2005) 151-154
Oxidative dehydrogenation of ethane and propane over Ca-Co-P catalystsA. Aaddane, M. Kacimi and M. Ziyad
Faculté des Sciences, Département de Chimie, Laboratoire de Physico-Chimie des Matériaux et Catalyse, Avenue Ibn Battouta, BP. 1014, Rabat, Maroc
Different compositions of calcium-cobalt phosphate Ca Co(PO4)2 (0x3) were synthesized by the precipitation method. The X-ray diffraction patterns showed that in the range 0 x0.3 the solid displays a whitlockite-type structure which belongs to rhombohedral symmetry with the space group R3c (Z = 6). U.V-visible investigations showed that Co2+ ions occupy the M(5) sites of the phosphate. The same technique revealed that all cobalt cations exist under the +II oxidation state. Pure tricalcium phosphate -Ca3(PO4)2 was found inactive in the ODH reactions of ethane and propane. An increase of Co2+ concentration in the catalysts improved the performances.
© EDP Sciences 2005