NiO-polyoxometalate nanocomposites as efficient catalysts for the oxidative dehydrogenation of propane and isobutane

摘要

Novel nanocomposites of NiO and polyoxometalate (Cs_(2.5)H_(0.5)PMo_(12)O_(40)) with particle sizes in the range of 5-10 nm showed exceptional oxygen and ammonia adsorption capabilities, and the nanocomposites catalyzed the oxidative dehydrogenation of propane and isobutane efficiently under mild conditions.rnSelective oxidation of light alkanes into olefins and organic oxygenates is an attractive route for the utilization of abundant light alkane resources. Although intensive efforts have been made in this field, selective oxidation of C_1-C_4 alkanes still remains an unsolved challenge, except for the conversion of n-butane to maleic anhydride. The main reason is that the alkane activation generally requires severe conditions, under which the consecutive oxidation of reactive target products to CO and CO_2 can easily occur, leading to low selectivities to target products at reasonably high conversions. Therefore, the development of efficient catalysts which are capable of working under mild conditions would be a promising route.