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Transient study of oxidative dehydrogenation of propane
Luleå tekniska universitet.
Chalmers University of Technology, Department of Chemical Reaction Engineering.
Department of Chemical Engineering, University of Waterloo.
Department of Chemical Engineering, University of Waterloo.
1999 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 187, no 1, p. 147-160Article in journal (Refereed) Published
Abstract [en]

Kinetics and the mechanism of the oxidative dehydrogenation of propane were investigated using various transient techniques. Results support a redox reaction mechanism in which propane and intermediate products react with lattice oxygen, reducing the catalyst surface, which is reoxidized by gas-phase O2. Partial reduction of the catalyst occurs during the start-up to a steady state. Successive pulsing with C3H8 reduced V5+ in the magnesium ortho-vanadate phase to V2+. Carbon-containing species were observed upon interruption of the reaction, although only minute amounts were formed. Cycling increases the amount of the carbon deposited, but this carbon is reactive and most of it is oxidized in the succeeding O2 pulse. Temperature-programmed oxidation (TPO) experiments on the catalyst used in steady-state operation revealed mainly strongly bound carbonaceous matter on the catalyst, but this carbon deposition did not affect catalyst activity. Thus, adsorbed oxygen is an important source of total combustion. Our experiments show, however, that lattice oxygen also produces total oxidation. Propene selectivity of the reaction in the absence of gas-phase O2 was superior to steady-state selectivity, at the same propane conversion. Propene selectivity could be further improved by increasing the degree of reduction of the catalyst

Place, publisher, year, edition, pages
1999. Vol. 187, no 1, p. 147-160
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-7578DOI: 10.1016/S0926-860X(99)00201-XISI: 000083155100016Local ID: 5f625b00-3ece-11de-bf5b-000ea68e967bOAI: oai:DiVA.org:ltu-7578DiVA, id: diva2:980468
Note

Godkänd; 1999; 20090512 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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