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Kinetic parameter estimation for supported vanadium oxide catalysts for propane ODH reaction: Effect of loading and support
, T.V.M. Rao, G. Deo
Published in
2006
Volume: 118
   
Issue: 3-4 SPEC. ISS.
Pages: 288 - 297
Abstract
Kinetic parameters are estimated for a sequential Mars van Krevelan (MVK) reaction model occurring over several supported vanadium oxide (vanadia) catalysts involved in the propane oxidative dehydrogenation (ODH) reaction. The estimated kinetic parameters, pre-exponential factors and activation energies, are used to understand the effect of vanadia loading and oxide support. The pre-exponential factors and vanadia normalized pre-exponential factors vary with vanadia loading and oxide support. The monotonic increase in normalized pre-exponential factors with vanadia loading and the variation of pre-exponential factors with oxide support appears to be related to the change in acidity/basicity of the catalyst and the redox nature of the catalyst, respectively. The activation energy for propene degradation does not significantly change with catalyst; however, the activation energy for propane oxidation is different for the V2O5/Al2O3 catalyst. It appears that two important considerations are required for the development of an efficient propane ODH catalyst: a high rate constant associated with the propane oxidation reaction, and a high ratio of the rate constant for propene formation to degradation reaction. Based on the observations in the present study it is proposed that a higher TiO2 support surface area will assist in increasing the propane oxidation activity and propene yield. © 2006 Elsevier B.V. All rights reserved.
About the journal
JournalCatalysis Today
ISSN09205861