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《Journal of Fuel Chemistry and Technology》 2003-01
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EFFECT OF PROMOTER ON SURFACE PROPERTIES AND CATALYTIC ACTIVITY OF Ru/C CATALYST FOR AMMONIA SYNTHESIS

ZHENG Xiaoling, FU Wujun, YU Yubin, ZHANG Shujuan, XU Jiaoxing, WEI Kemei(National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou350002, China)  
A series of alkaline or/and alkalineearthpromoted, carbonsupported ruthenium catalysts have been prepared N2 physisorption, CO chemisorption and Xray diffraction were carried out to investigate the effect of promoter on the surface area, pore size distribution and ruthenium dispersion of catalysts The activities of the series catalyst for ammonia synthesis were measured under the reaction condition 430?℃, 100?MPa and 10?000?h-1 It has been found that the effectiveness of alkaline or alkalineearthpromoter is roughly related to the basicity of alkaline metal hydroxide or alkalineearth metal oxide For the singlepromoted Ru/C catalyst, cesium and barium proved to be most effective in the alkaline and alkalineearth promoter Bariumpromoted Ru/C catalyst was more effective in ammonia synthesis than cesiumpromoted Ru/C catalyst Barium was suggested to have a stronger interaction with the Ru surface than cesium For the doublepromoted Ru/C catalyst, the activity of the catalyst was affected remarkably by the method of preparation Barium and cesium promoter in 4?w% RuBaCs/C were impregnated by two steps method, barium was impregnated first, after reducing treatment at 400?℃, cesium was impregnated again The catalyst of 4?w%RuCsBa/C was prepared from impregnating cesium first barium later by two step impregnation The catalyst of4?w% Ru(Ba+Cs)/C was prepared from coimpregnation the mix aqueous solution of barium and cesium by one step method The result showed that the activity of 4?w% RuBaCs/C was higher obviously not only than 4?w%Ru(Ba+Cs)/C, but also than 4?w% RuCsBa/C Because barium and cesium competed adsorption during theprocess of preparing the doublepromoted Ru/C catalyst, that would influence the surface distribution of barium and cesium promoter and ammonia synthesis activity of the Ru/C catalyst
【Fund】: 国家科技攻关计划项目(2001BA322C);; 福建省科技厅资助项目(2000F002);; 福州大学科技发展基金[XKJ(QD) 0102] 
【CateGory Index】: O643.31
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