A Thermodynamic Investigation of the Redox Properties of VPO Catalysts |
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| Authors: | Kevin Bakhmutsky Jasmin Imran Alsous Raymond J Gorte |
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| Affiliation: | (1) Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 311A Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA; |
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| Abstract: | Abstract The redox properties of a vanadium phosphorus oxide (VPO) catalyst with a V:P ratio of one were investigated using Coulometric
Titration at 873 K. Equilibrium between (VO)2P2O7 and VOPO4 exists at a P(O2) of 3 × 10−4 atm, corresponding to ΔG of −60 kJ/mol O2. This value for VPO is significantly lower than that measured with other vanadium-containing catalysts that have been studied.
Furthermore, compared to other vanadium catalysts, V+4 was stabilized against further reduction at lower P(O2). These redox thermodynamics may help to explain the unique catalytic properties of VPO catalysts for partial oxidation of
butane to maleic anhydride. |
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