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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12320

Title: Effects of reductibility on propane oxidative dehydrogenation over γ-Al2O3-supported chromium oxide-based catalysts
Authors: Jibril, B.Y.
Al-Zahrani, S.M.
Abasaeed, A.E.
Hughes, R.
Keywords: Chromium oxide; Molybdenum oxide; Oxidative dehydrogenation; Propane; Propylene; TPR; XPS
Issue Date: 2003
Citation: Catalysis Letters : Volume 87, Issue 3-4, Pages 121-132
Abstract: Alumina-supported chromium oxide and binary mixed oxide catalysts of the form Cr-M oxide/γ-Al2O3 (where M is Ni, Co, Mo, W, Ho, La, Li, Cs or Bi) were found to catalyze the oxidative dehydrogenation of propane at 300-450 °C. The basic characters of the metals were found to determine partly the selectivity to propylene. Cr-Mo/γ-Al 2O3 proved to be the most promising. It exhibited a propylene yield of 10.3% at 450 °C. The connections between the selectivity and reducibility of the catalyst were explored. TPR results showed that addition of molybdenum to chromium increased the temperature of reduction maxima. Thus the selectivity to propylene was improved by a decrease in the tendency of the catalyst to undergo a redox cycle. Further, an X-ray photoelectron spectroscopy study conducted on a sample of the catalysts showed that the basicity of the catalysts increased with increase in molybdenum. Catalysts with appropriate Cr/Mo ratios exhibited lower selectivity to over-oxidation product than those containing either chromium or molybdenum alone.
URI: http://hdl.handle.net/123456789/12320
ISSN: 1011372X
Appears in Collections:College of Engineering

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