Abstract
Keggin-type 12-molybdophosphates have been found to catalyze the selective oxidation of isobutane, propane, and ethane into methacrylic acid, acrylic acid, and ethene, respectively, with molecular oxygen. Cs +-, Fe 3+-, or Ni 2+-substitution for H + and V 5+-substitution for Mo 6+ in H 3PMo 12O 40 enhanced the catalytic activity for the oxidation of propane. Among the catalysts tested Cs 2.5Fe 0.08H 1.26PVMo 11O 40 gave the highest yield of acrylic acid: 13%. It was suggested by IR, XRD, TG-DTA data that the Keggin structure was maintained during the oxidation.
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