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Selective oxidation of propane into oxygenated compounds over promoted nickel-molybdenum catalysts

1997; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(97)80998-6

2542-6613

J. Barrault, Catherine Batiot‐Dupeyrat, Laurent Magaud, M. Ganne,

Oxidative Organic Chemistry Reactions

The oxidative coupling of methane (OCM) and the selective oxidation of the other light paraffins, such as ethane, propane, isobutane, are of prime interest. The oxidative dehydrogenation of propane to propene and its selective oxidation to acrolein and acrylic acid have been studied over various solids. Bismuth-molybdenum (Bi-Mo) (W,V, Ti) aurivillius or sillen phases and Bi-Mo oxides supported on titania are more selective for the propane oxidative dehydrogenation (P.O.D.) to propene, whereas the properties of nickel molybdate catalysts are greatly dependent of the molybdenum coordination and on the MoO3 content. In this field, the objective is to improve the activity of molybdenum based materials either for the P.O.D. to propene or the selective oxidation of propane to acrolein and acrylic acid. The catalytic performances of NiMoO4–MoO3 phases, doped with bismuth, are focused on in this chapter. When the reaction is carried out with [NiMoO4-MoO3] systems, a synergetic effect both for the activity and the selectivity is obtained when the molar ratio αMoO3/(αMoO3+αNiMoO4) is around 0.25. A reciprocal coverage of the two phases (αMoO3, αNiMoO4) can lead to changes of the surface structure.