α-Ni/γ-Al_2O_3催化剂催化一氧化碳甲烷化反应的研究

Study on α-Ni/γ-Al_2O_3 catalysts for methanation of carbon monoxide

在连续流动固定床装置上考察了α-Ni/γ-Al2O3催化剂制备方法和反应空速对一氧化碳甲烷化反应的影响。与其他方法制备的催化剂相比,采用研混还原法制备的催化剂活性较高,在n(CO):n(H2)=1:3、常压、593K及空速2500h-1反应条件下,研混还原法制备的w(Ni)为15%的α-Ni/γ-Al2O3催化剂催化一氧化碳合成甲烷的选择性达90%以上,一氧化碳的转化率接近100%。采用BET、XRD及TEM等技术对催化剂进行了表征。

The effects of preparation methods of α-Ni/γ-Al2O3 catalysts and gas hourly space velocity on methanation of carbon monoxide were investigated in a continuous flow fixed-bed reactor. The α-Ni/γ-Al2O3 （w（Ni）=15%） prepared by grind-mixing method showed better activity than the others, over this catalyst, the selectivity to methane was over 90% and CO conversion was near to 100% under the reaction conditions： n（CO）/n（H2）=1/3, atmospheric pressure, T=593K and GHSV=2500h^-1. The catalysts were characterized by means of BET, XRD and TEM techniques.