Catalysis Today, Vol.297, 298-307, 2017
Loading Ni/La2O3 on SiO2 for CO methanation from syngas
The critical problem for CO methanation catalysts to produce synthetic natural gas is deactivation due to carbon deposition and/or sintering of the active components. It was reported that Ni/La2O3 has better resistance to sintering and can eliminate the carbon deposited via lanthanum containing compound. However, the lanthanum oxide has low surface area, mechanical strength and stability. To overcome this problem, a new scheme has been proposed in this study by supporting the perovskite-type oxide of LaNiO3 on SiO2. Nickel and lanthanum ions are evenly dispersed at atomic level in the nanocrystallites of LaNiO3, after reduction highly dispersed small Ni nanoparticles were supported on La2O3 which spread on SiO2. Thus, Ni/La2O3 was loaded on SiO2. The catalysts were characterized by means of BET, XRD, HRTEM + EDX, H-2 chemisorption, ICP, and TGA techniques, and their catalytic performances were measured for CO methanation from syngas to generate CH4. The prepared catalyst derived from LaNiO3/SiO2 showed very good catalytic performance, especially showed very high resistance towards carbon deposition and nickel sintering. The NiO-La2O3/SiO2 prepared by common incipientwetness impregnation method was investigated for comparison. This method can be extended for loading other catalysts, for that a lot of metallic ions can be acted as the ions of perovskite-type oxides.