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Catalytic and physicochemical properties of V-Mo-Nb oxide catalysts (V 0.3 Mo 1 Nb x , where x = 0.05, 0.15, 0.22, and 0.27) have been studied in the ammoxidation of ethane. An increase in the Nb content in the samples is accompanied by an increase in the catalytic activity and selectivity to acetonitrile. It was established that a triple Mo 5 O 14 -like phase with a variable composition (V 0.23 ± 0.3 Mo 1 Nb x = 0.2÷0.37) acts as an active component in the catalyst.

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Epoxidation of 1,3-butadiene has been studied in acetonitrile solutions of aqueous H 2 O 2 and tetrabutylammonium or 1-ethyl-3-methylimidazolium NaH [PW 11 O 39 ]. The selectivity of the 1,3-butadiene to 3,4epoxy-1-butene (EpB) conversion attains 97% at nearly 100% efficiency of the H 2 O 2 consumption. The rate of the EpB formation has been correlated with the solution compositions as found by 31 P NMR under the reaction conditions.