Zhejiang Key Laboratory of Green-Chemistry Synthesis Technology;
Institute of Catalysis;
Zhejiang University of Technology;
Hangzhou 310032;
China;
Zhejiang Key Laboratory of Green-Chemistry Synthesis Technology;
Institute of Catalysis;
Zhejiang University of Technology;
Hangzhou 310032;
Chinahe effects of promoters K;
Ba;
Sm on the resistance to carbon-methanation and catalytic activity of ruthenium supported on active carbon (Ru/AC) for ammonia synthesis have been studied by means of TG-DTG (thermalgravity-differential thermalgravity);
temperature-programmed desorption;
and activity test. Promoters Ba;
K;
and Sm increased the activity of Ru/AC catalysts for ammonia synthesis significantly. Much higher activity can be reached for Ru/AC catalyst with bi- or tri-promoters. Indeed;
the triply promoted catalyst showed the highest activity;
coupled to a surprisingly high resistance to methanation. The ability of resistance of promoter to methanation of Ru/AC catalyst is dependent on the adsorption intensity of hydrogen. The strong adsorption of hydrogen would enhance methanation and impact the adsorption of nitrogen;
which results in the decrease of catalytic activity.;
甲烷化; 接触反应; 反应活性; Ru/AC; 氨合成法; 钌; 催化剂;