Transient kinetics of n-butane partial oxidation at elevated pressure

Authors

  • Ali Shekari,

    1. Department of Chemical Engineering, École Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7
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  • Gregory S. Patience

    Corresponding author
    1. Department of Chemical Engineering, École Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7
    • Department of Chemical Engineering, École Polytechnique de Montréal, C. P. 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7.
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Abstract

A transient Mars-van Krevelen type kinetic model was developed for n-butane partial oxidation over vanadyl pyrophosphate (VPP) catalyst. The model validity was verified over a relatively wide range of redox feed compositions as well as higher reactor pressure (410 kPa). Oxygen and n-butane conversion increased with higher pressure while maleic anhydride (MA) selectivity decreased by as much as 20%. However, the overall MA yield was enhanced by up to 30%. High pressure maintains the catalyst in a higher oxidation state (as long as there is sufficient oxygen in the gas phase) and as a consequence, the catalytic activity is improved together with MA yield. High pressure also affects the redox reaction rates and activation energies. © 2012 Canadian Society for Chemical Engineering

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