Ni-based catalysts prepared by impregnation combustion method for CO methanation in a slurry-bed reactor

作者：Ji, Keming; Meng, Fanhui; Li, Zhong^*

来源：Asia-Pacific Journal of Chemical Engineering, 2016, 11(1): 151-157.

DOI：10.1002/apj.1953

• slurry-bed reactor
• methanation
• impregnation combustion method
• Ni@Al2O3 catalyst
• Ni content

A series of xNi@Al2O3 catalysts with different Ni content was prepared by impregnation combustion method, the catalytic performance for CO methanation in a slurry-bed reactor at low-temperature was studied, and the structure of the catalysts was characterized by X-ray diffraction, N-2 adsorption-desorption, temperature-programmed reduction of H-2, transmission electron microscope, and H-2 chemisorption. The results show that as Ni content increased from 5 to 45%, the crystallite size of metallic Ni increased and the specific surface area decreased, while as the Ni content was between 25 and 45%, the metal Ni surface area firstly increased and was then maintained at around 10m(2<bold>)g(</bold>-1). The catalytic activity of xNi@Al2O3 catalysts increased as the Ni content rose from 5 to 25%, and then remained constant as the Ni content continued to rise. Under the reaction conditions of 300 degrees C, 1MPa, and 3000mL<bold>g(</bold>-1<bold>)h(</bold>-1), 25Ni@Al2O3 catalyst exhibited the best catalytic performance; the CO conversion and the CH4 selectivity reached 94.3 and 93.7%, respectively.

• 出版日期2016-1
• 单位太原理工大学