Bimetallic Ni-Co Alloy Derived from Perovskite as Precursor on SiO2 as Catalysts for CO Methanation

Abstract

The supported bimetallic Ni-Co alloy catalysts modified with La2O3 were prepared by using the perovskite composite oxide of LaNi[Formula: see text]Co[Formula: see text]O3/SiO2 as the precursor, which were obtained by the impregnation method combined with the citrate complex method. The samples were characterized through using XRD, BET, H2-TPR, CO-TPD, TG and XPS, and the catalytic performances for CO methanation was investigated. The component among the bimetallic (Ni-Co) alloy-La2O3/SiO2 catalyst would be mutually diluted, consequently exhibiting pretty good resistance to metal sintering. The carbon deposition on the catalyst surface mainly depends on the adsorption form of CO, the doping of Co changed the adsorption form and adsorption strength of Co, thereby, the bimetallic Ni-Co catalyst showed strong resistance to carbon deposition. Comparing with the mono-metallic nickel catalyst, the supported bimetallic Ni-Co alloy catalysts exhibited good catalytic activity, selectivity and stability for CO methanation, especially excellent resistance to carbon deposition and metal sintering.