The effect of carriers on properties of supported NiO catalysis in oxidative dehydrogenation of n-butane in the presence of CO2.

Abstract

Oxidative dehydrogenation of n-butane to butene on NiO based catalysts with the presence of carbon dioxide was studied. The phase structure of NiO has been found to depend on the nature of carrier as well as on its content. The determining factors ill activity and selectivity of the studied catalysts are NiO-support interaction, reducibility of NiO and their acidic properties. On each carrier the optimal content of NiO for giving the best catalytic perfomence is as follows: 7wt.% on Al2O3, 8wt.% on SiO2, 4wt.% all active carbon and 5wt% on HZSM-5. About 38% of butane conversion and 71% of butenes selectivity were observed on 5% NiO/HZSM-5(200).Optimal conditions of the reaction are: mol ratio n-C4H10: CO2 = 1:5 and 1:2, temperatures: 625 and 50⁰C for catalysts on HZSM5 and for the rest, correlatively