Effects of composite oxide supports on catalytic performance of Ni-based catalysts for CO methanation
- 化学化工－已发表论文 
Metal-oxide-modified NiO/Al2O3 catalysts for methanation of CO were prepared using a modified grinding-mixing method and characterized using X-ray diffraction, transmission electron microscopy, N-2 adsorption-desorption isotherms, temperature-programmed reduction by H-2, temperature-programmed desorption by H-2, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that the activity of an MgO-modified NiO/Al2O3 catalyst is better than those of NiO/ZrO2-Al2O3 and NiO/SiO2-Al2O3 in the reaction temperature range 300-700 degrees C. The incorporation of a metal oxide into NiO/Al2O3 was found to weaken Ni-Al interactions, leading to generation of large numbers of active Ni species, and this was confirmed to be responsible for the improvement in the performances of the catalysts in the methanation reaction. (C) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.