Kinetics of the Oxidative Dehydrogenation of Propane over a VMgO Catalyst

摘要/Abstract

摘要： The reaction kinetics of the oxidative dehydrogenation of propane was studied at 475-550oC over a VMgO catalyst. Vanadium-magnesium-oxides are among the most selective and active catalysts for the dehydrogenation of propane to propylene. Selectivity to propylene up to about 60% was obtained at 10% conversion, but the selectivity decreased with increasing conversion. No oxygenates were detected, the only by-products were CO and CO2. The reaction rate of propane was found to be first order in propane and close to zero order in oxygen, which is in agreement with a Mars van Krevelen mechanism with the activation of the hydrocarbon as the rate determining step. The activation energy of the conversion of propane was found to be 122±6 kJ/mol.

关键词: propane, oxidative dehydrogenation, VMgO, kinetics

Abstract: The reaction kinetics of the oxidative dehydrogenation of propane was studied at 475-550oC over a VMgO catalyst. Vanadium-magnesium-oxides are among the most selective and active catalysts for the dehydrogenation of propane to propylene. Selectivity to propylene up to about 60% was obtained at 10% conversion, but the selectivity decreased with increasing conversion. No oxygenates were detected, the only by-products were CO and CO2. The reaction rate of propane was found to be first order in propane and close to zero order in oxygen, which is in agreement with a Mars van Krevelen mechanism with the activation of the hydrocarbon as the rate determining step. The activation energy of the conversion of propane was found to be 122±6 kJ/mol.

Key words: propane, oxidative dehydrogenation, VMgO, kinetics

L. Late;E. A. Blekkan. Kinetics of the Oxidative Dehydrogenation of Propane over a VMgO Catalyst[J]. 能源化学(英文), 2002, 11 (1): 33-42.

L. Late;E. A. Blekkan. Kinetics of the Oxidative Dehydrogenation of Propane over a VMgO Catalyst[J]. Journal of Energy Chemistry, 2002, 11 (1): 33-42.

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