J. Phys. IV France
Volume 123, March 2005
Page(s) 151 - 154

J. Phys. IV France 123 (2005) 151-154

DOI: 10.1051/jp4:2005123025

Oxidative dehydrogenation of ethane and propane over Ca-Co-P catalysts

A. 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 $_{3-{\rm x}}$Co$_{\rm x}$(PO4)2 (0$\le $x$\le $3) were synthesized by the precipitation method. The X-ray diffraction patterns showed that in the range 0 $\leq$x$\le $0.3 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 $\beta $-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