J. Phys. IV France 123 (2005) 313-317
Catalytic behaviour of cobalt exchanged hydroxyapatite in the oxidative dehydrogenation of ethaneK. Elkabouss1, 2, M. Kacimi1, M. Ziyad1 and F. Bozon-Verduraz2
1 Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences, Département de Chimie, Rabat, Maroc
2 Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, 2 place Jussieu, 75251 Paris, France
Several samples of exchanged cobalt/calcium (Co2+/Ca2+) hydroxyapatite were synthesized and characterised by XRD, IR and UV-visible spectroscopy. The level of Co2+/Ca2+ exchanged was limited to 1.35 wt% of Co and the Co2+ ions incorporated in the phosphate matrix were mainly hosted by octahedral sites. The catalytic activity of these materials was measured in the oxidative dehydrogenation of ethane into ethylene in the 450-550C range. The global conversion and the ethylene yield increase with temperature and depend upon the cobalt content. They reached 35% and 22% at 550C respectively for a Co wt% of about 1%.
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