Résumé
Copper loaded hydroxyapatite catalysts have been prepared by wet impregnation and have been tested in the selective catalytic reduction of NO by NH3. The catalyst characterization showed the presence of copper oxide nanoparticles entrapped in the mesoporous matrix thus obstructing the Ca-Hap channel apertures. With increasing copper loading, there is a deposition of copper oxide clusters, on the surface of the carrier, containing Cu2+ and Cu+ ions. Compared to the catalyst prepared by the ion exchange method, Cu(1.12)Hapi.e, which exhibited excellent NO conversion over a broad temperature range, the impregnated catalysts are less efficient in the selective catalytic reduction of NO by NH3.