Synthesis and characterization of cobalt-molybdenum oxides catalysts supported on magnesium phosphates

M. Sadiq1, A. Sahibed-dine1, M. Baalala1, K. Nohair1, M. Bensitel1*,

E. Payen2, C. Lamonier2, J. Leglise3,4

1 Laboratoire de Catalyse et Corrosion des Matériaux, Université Chouaib Doukkali, Faculté des Sciences,

B.P. 20, El Jadida 24000 Morocco

2 Laboratoire de Catalyse, UMR.CNRS.8010, Université de Lille 1, 59650 Villeneuve d’Ascq. Lille, France

3 Laboratoire de Catalyse et Spectrochimie, UMR.CNRS.6506, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France

4 present address : DRRT, 2 rue Grenet Tellier, 51038 Châlons en Champagne, France

* Corresponding author. E-mail: medbensitel@hotmail.com

Received : 22 February 2005; revised version accepted :29 June 2005

Abstract

In this work, magnesium phosphates named MgP were synthesized by coprecipitation from an aqueous solution containing Mg(NO3)2.6H2O and H3PO4 (85%) with addition of an 0.4 M NaOH solution until pH 9. The solids Co-Mo/MgP were synthesized by the dry-impregnation method, with loadings ranging from 4 to 12 wt.% of MoO3 with a Co/Mo atomic ratio fixed at 0.5. The solids obtained were then characterised by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), infrared spectroscopy (IR); and their specific surface area were determined using gas adsorption measurements of nitrogen.

Keywords: Magnesium phosphates; Co-Mo/MgP; XRD; TGA-TDA; IR; BET.

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