Plasma-catalytic CO2 methanation over NiO/bentonite catalysts prepared by solution combustion synthesis

A solution combustion synthesis (SCS) process to prepare nickel catalyst over bentonite (NiO/Ben) is reported. Compared to the traditional impregnation method, NiO/ben produced by SCS has smaller nickel particle size and higher dispersion. With a metal loading of 20 wt%, the afforded NiO/Ben demonstrates excellent catalytic activity for CO 2 methanation in a dielectric barrier discharge reactor. In certain discharge conditions (H 2 :CO 2 ratio of 5 in feed gas, discharge input power of 45 W, and gas hourly space velocity of 11 320 h − 1 ), CO 2 conversion and CH 4 selectivity are as high as 55.8% and 84.6%, respectively. Under the conditions of plasma configuration, the strong interaction between the nickel species and the support plays an important role in the CO 2 methanation process.