Abstract
A new silver molybdenum phosphate, AgMo3P2O14, involving a mixed molybdenum valency, was found to play a role in mild propane oxidation (6% propane conversion, 70% propene selectivity, 6% acrolein selectivity at 733 K). Comparisons with results obtained with other molybdenum phosphates showed that silver presented a positive influence when it was able to migrate inside the MoPO host lattice. Characterizations of this catalyst, by XRD, X-ray absorption spectroscopy, and XPS, performed before and after catalytic tests, emphasized the importance of the redox couple MoV/MoVI. Moreover, the ability of the framework to allow the establishment of a correct MoV/MoVIbalance of 2/1 was found to be a determining factor.
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