Report

Chemically Induced Fast Solid-State Transitions of ω-VOPO4 in Vanadium Phosphate Catalysts

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Science  01 Sep 2006:
Vol. 313, Issue 5791, pp. 1270-1273
DOI: 10.1126/science.1130493

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Abstract

Vanadium phosphates are important catalysts for the oxidation of alkanes, and commercial catalysts comprise a complex range of V4+ and V5+ phosphates. We used three complementary in situ characterization methodologies—powder x-ray diffraction and laser Raman and electron paramagnetic resonance spectroscopies—to show that the metastable phase ω-VOPO4 is very sensitive to many of the reactants and products of butane oxidation. A rapid transformation from ω-VOPO4 to δ-VOPO4 occurs on exposure to butane at the reaction temperature, and hence the metastable ω-VOPO4 may play a role in the formation of commercial catalysts.

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