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The sulphided state of nickel molybdenum catalysts supported on zirconia and aluminates |
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| Authors: | F Maug JC Duchet JC Lavalley S Houssenbay E Payen J Grimblot S Kasztelan |
| Affiliation: | a Laboratoire de Catalyse et Spectrochimie, U.R.A. C.N.R.S. no 414, I.S.M.R.A., 6, Boulevard du Maréchal Juin, 14050 - Caen Cédex France. b Laboratoire de Catalyse Hétérogène et Homogène, U.R.A. C.N.R.S. no 402, Université des Sciences et Techniques de Lille Flandres-Artois, Bâtiment C3, 59655 Villeneuve d'Ascq Cédex France. c Institut Français du Pétrole, B.P. 311, 2, Avenue de Bois Préau, 92500 Rueil-Malmaison Cédex France. |
| Abstract: | Characterization of the sulphided Ni-MoS2 state supported on various carriers (aluminates, zirconia) has been undertaken in order to study the influence of the carrier on the genesis of the promoted active phase, refered to as the “NiMoS” phase. The influence of the sulphidation temperature on the stability of nickel associated in that phase has also been explored. The basis of comparison is a classical Ni-MoS2-alumina catalyst. In all these systems nickel interacts with molybdenum sulphide (decoration like position) but the “NiMoS” phase appears less stable on zirconia. On these aluminate and zirconia carriers, the charge transfer from nickel to molybdenum sulphide, as evidenced by the shifts of the active IR band of adsorbed carbon monoxide, has been found to be weaker than on the alumina supported catalyst. Such a carrier effect has been correlated with thiophene HDS activity results and discussed in terms of morphological effects as revealed by HREM. |
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