Barothermal Synthesis and Catalytic Properties of Vanadium–Phosphorus Oxide Systems in Oxidative Transformations of Butane and Ethane

Abstract

It was shown that under the conditions of barothermal synthesis of vanadium–phosphorus oxide catalysts the individual vanadium oxide phase VOHPO4·0.5 H2O is only formed in the n-butanol medium. The duration of the synthesis has a substantial effect on the surface morphology of the samples; with increase of the synthesis time structures of “rose” type are twisted and form “plaits.” The “rose” type structures have high activity and selectivity in the oxidation of n-butane (1.5-1.7 vol.% in air). With hydrocarbon contents of 3.4 vol.% structures of the “plait” type are more effective, which makes recycling possible. Catalysts with the “plait” morphology are also more effective in the oxidative dehydrogenation of ethane.