Abstract
The selective oxidation of n-butane to maleic anhydride (MA) on (VO) 2P 2O 7-based catalysts having different vanadium oxidation states (+3.18 to +4.90) was studied by a vacuum transient technique applying the Temporal-Analysis-of-Products (TAP) reactor. Experiments in the absence of gas-phase oxygen (anaerobic conditions) revealed that all steps of the oxidation to MA may proceed on V 5+ as well as on V 4+ sites and that the step from furan to MA needs the catalyst state with the highest oxidation potential. In equilibrated (VO) 2P 2O 7 catalysts the valence state of the vanadium in the surface layers involved in the selective reaction amounted to +4 and +5. Under such conditions all reaction steps primarily occur on V 5+ centers but a contribution of the redox couple V 4+ V 3+ in these steps cannot be excluded.
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