Developing Ni-based honeycomb-type catalysts using different binary oxide-supported species for synergistically enhanced CO2 methanation activity

Abstract Honeycomb-type structured nickel-based catalysts based on the binary oxides TiO 2 , Al 2 O 3 , Y 2 O 3 , and CeO 2 as supporters of CO 2 methanation were successfully synthesized under various conditions by using different coating solutions and characterized. The prepared catalysts were further tested, and their CO 2 methanation activity, stability, and selectivity were compared under different operating conditions at varying temperatures. The results revealed better CO 2 methanation with an isopropanol-coated liquid than with distilled water, Si binder, and Ludox. Among the synthesized catalysts, the 10 wt% Ni/CeO 2 honeycomb-type catalyst showed the highest CO 2 methanation catalytic activity, stability, and selectivity, with a CO 2 conversion efficiency of more than 80% during testing at an optimal temperature of 298 °C, space velocity of 743 h −1 , and catalyst loading of 134 g/L. The optimum parameters and CO 2 conversion efficiency were verified and reconfirmed through response surface analysis. The 10 wt% Ni/CeO 2 catalyst is a promising catalyst with excellent potential for application in CO 2 methanation.