Abstract
Multicomponent Keggin-type heteropolyacid catalysts were prepared by refluxing MoO 3, V 2O 5 and CuO in aqueous solutions of phosphoric acid. Characterization of the recovered solids by elemental analysis, thermal gravimetric analysis, infra-red spectroscopy, UV–Vis reflectance spectroscopy, and X-ray absorption spectroscopy at the K edges of Mo and Cu, indicated V ions substituted for Mo ions in phosphomolybdic acid, whereas Cu ions did not substitute into the Keggin units. The Cu ions apparently functioned as charge-balancing counter ions in the neutral solid since formation of a Cs salt lowered the Cu content. The activity of Cu,V-containing heteropolyacid for oxidative dehydrogenation of propane to propene at 573 K was greater than that of H 3PMo 12O 40 and H 4PMo 11VO 40, but was similar to that of a physical mixture of CuO and H 4PMo 11VO 40. Substitution of Cu into a Keggin unit does not appear to be necessary for promotion of the oxidative dehydrogenation reaction.
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