Oxydehydrogenation of propane to propylene with metal molybdates

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370207

Stern, D L; Grasselli, R K ^[1]

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1. Mobil Oil Corp., Princeton, NJ (United States)

Single and binary metal molybdates of the formula AMoO{sub 4}, where A=Ni, Co, Mg,Mn and/or Zn, were investigated for the oxydehydrogenation of propane to propylene, as well as some ternary molybdates of the formula NiO{sub 0.45}Co{sub 0.45}X{sub 0.066}MoO{sub 4} where X=P, Bi, Fe, Cr, V and Ce. All catalysts were supported on SiO{sub 2} with an active phase/support ratio of 80/20 (wt%). The reaction is catalytic and not a gas phase initiated reaction. It is first order in propane, consistent with the abstraction of the methylene hydrogen being the rate limiting step. Propane conversions and propylene yields vary greatly depending on the metal of the molybdate and surface area of the catalyst. Highest propylene yields (16% at 26.6% propane conversion) are obtained with NiMoO{sub 4}/SiO{sub 2}. Conversion and yield are significantly influenced by the molybdenum content of the compositions. The effect is biggest in the nickel molybdate system. Its optimum activity lies at the stoichiometric composition, with both molybdenum rich and molybdenum lean compositions being much less active. Conversely, cobalt molybdates` optimum activity lies at molybdenum lean compositions with the stoichiometric being intermediate and the molybdenum rich being the least active. Binary nickel-cobalt-molybdates are less sensitive to the molybdenum level.

• OSTI ID: 370207
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ADSORPTION
CATALYTIC EFFECTS
CHEMICAL REACTION YIELD
COBALT
DEHYDROGENATION
MAGNESIUM
MOLYBDATES
NICKEL
PETROLEUM PRODUCTS
PROPANE
PROPYLENE
SURFACE AREA
ZINC