CHARACTERIZATION OF AGMO3P2O14 CATALYST ACTIVE IN PROPANE MILD OXIDATION

A new silver molybdenum phosphate, AgMo3P2O14, involving a mixed molyb denum valency, was found to play a role in mild propane oxidation (6% propane conversion, 70% propene selectivity, 6% acrolein selectivity a t 733 K). Comparisons with results obtained with other molybdenum phos phates showed that silver presented a positive influence when it was a ble to migrate inside the MoPO host lattice. Characterizations of this catalyst, by XRD, X-ray absorption spectroscopy, and XPS, performed b efore and after catalytic tests, emphasized the importance of the redo x couple Mo-V/Mo-VI. Moreover, the ability of the framework to allow t he establishment of a correct Mo-V/Mo-VI balance of 2/1 was found to b e a determining factor. (C) 1997 Academic Press.