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《Chinese Journal of Catalysis》 2004-03
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Effect of Activated Carbon and Its Surface Property on the Activity of Ru/AC Catalyst

HAN Wenfeng, ZHAO Bo, HUO Chao, LIU Huazhang*(Zhejiang Key Laboratory of Heterogeneous Catalysis, Institute of Catalysis, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China)  
Activated carbons (AC) were pretreated by washing with HNO 3 and calcination before the preparation of Ru/AC ammonia synthesis catalysts. The structure, texture and surface oxygen groups of the samples were investigated by N 2 physisorption and He-TPD, and their effect on the Ru dispersion was studied by CO chemisorption as well as on catalytic activity by activity test. The result showed that a more developed texture of the carbon support resulted in a higher dispersion of Ru metal. Furthermore, part of the surface oxygen groups was the centers of Ru deposition, their amount affected the dispersion of Ru and the activity of catalyst. HNO 3 treatment of activated carbon led to the great increase in surface oxygen groups, but some of the surface oxygen groups were unstable and decomposed into CO and CO 2 during the catalyst reduction. Thus Ru metal deposited on them will assemble, which is unfavorable for Ru dispersion. Although the Ru dispersion was not improved after HNO 3 treatment, the catalytic activity was increased from 17.4% to 18.4% because of the reduction of S and ash. Gas-phase oxidation of carbon changed its texture and surface groups significantly. So the Ru dispersion and catalytic activity were improved from 43% to 62% and 17.4% to 19%, respectively.
【Fund】: 国家自然科学基金资助项目 (2 0 2 0 3 0 16);; 中国石油化工总公司资助项目 (4 990 5 1)
【CateGory Index】: O643.3
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