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

A. Aaddane; M. Kacimi; M. Ziyad

doi:doi:10.1051/jp4:2005123025

Numéro		J. Phys. IV France Volume 123, March 2005


Page(s)		151 - 154
DOI		https://doi.org/10.1051/jp4:2005123025

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

Abstract
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.