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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12072

Title: Propane oxidative dehydrogenation over alumina-supported metal oxides
Authors: Al-Zahrani, Jibril, B.Y., S.M. ,
Abasaeed, A.E.
Keywords: Alumina; Barium; Calcination; Catalysis; Catalyst selectivity; Chromium; Manganese; Pressure effects; Propane; Thermal effects; Vanadium; Zirconium
Issue Date: 2000
Citation: Industrial and Engineering Chemistry Research: Volume 39, Issue 11, Pages 4070-4074
Abstract: Alumina-supported oxides of V, Cr, Mn, Zr, and Ba were found to catalyze propane oxidative dehydrogenation to propylene at atmospheric pressure, reaction temperatures of 350-450 °C, and a total feed flowrate of 75 cm3/min (26.7% propane, 6.6% oxygen, and the rest helium). Maximum propane conversion (26%) and selectivity to olefin (70%) were achieved with vanadium oxide at 450 °C. The other metal oxides showed lower conversions (9-17%) and olefins selectivities (36-58%). This observation was explained on the basis of the lattice oxygen reactivity as estimated from the reduction potential of the metal cations. Metals whose cations have high potentials (e.g., vanadium oxide catalyst) were found to favor low CO(x) and high selectivity to propene and ethene. This suggests that the metal-oxide bond strength strongly influences the selectivity to olefins in this reaction. A weak linear correlation between the selectivity to propene and the aqueous reduction potential of the cations was found. Alumina-supported oxides of V, Cr, Mn, Zr, and Ba were found to catalyze propane oxidative dehydrogenation to propylene at atmospheric pressure, reaction temperatures of 350-450°C, and a total feed flowrate of 75 cm3/min (26.7% propane, 6.6% oxygen, and the rest helium). Maximum propane conversion (26%) and selectivity to olefin (70%) were achieved with vanadium oxide at 450°C. The other metal oxides showed lower conversions (9-17%) and olefins selectivities (36-58%). This observation was explained on the basis of the lattice oxygen reactivity as estimated from the reduction potential of the metal cations. Metals whose cations have high potentials (e.g., vanadium oxide catalyst) were found to favor low COx and high selectivity to propene and ethene. This suggests that the metal-oxide bond strength strongly influences the selectivity to olefins in this reaction. A weak linear correlation between the selectivity to propene and the aqueous reduction potential of the cations was found.
URI: http://hdl.handle.net/123456789/12072
ISSN: 08885885
Appears in Collections:College of Engineering

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