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《Acta Scientiae Circumstantiae》 2004-04
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Catalytic reduction of NO with CO by sepiolite loaded with IB group metals

LI Li, YAO Weihua, LI Yunqiao, WU Xiaomei, LI Junliang, Wang Dao\ (College of Environmental and Energy Engineering, Beijing University of Technology, Beijing100022)   
The natural sepiolite was treated with hydrochloric acid. The conditions of sepiolite modification were chosen by orthogonal experiments. The optimized conditions of sepiolite modification were: the concentration of hydrochloric acid at 12?mol·L-1; the solid/liquid volume ratio at 1:20; the soaking time at 20h; and the soaking temperature at 333?K. The catalysts for reduction of NO with CO were made of IB group metal (Cu, Ag and Au) impregnated on modified sepiolite. The catalytic performance was studied under oxidizing conditions. The samples were characterized by thermogravimetric analysis (TGA), Xray diffraction (XRD), temperatureprogrammedreduction of H2 (H2TPR), and BET. Among the three metal catalysts, Cu/sepiolite was found to be the most active one for NO reduction with CO in the presence of oxygen. In the three kinds of catalysts, Au/Sep showed the lowest catalytic activity, while NO conversion was higher over Ag/Sep. The maximum conversion of NO was observed on the Cu (5wt.%)/sepiolite which was calcinated at 400℃. The addition of Ce and Sm to Cu catalysts was found to improve the catalytic activity. The effects of oxygen content and the GHSV (gas hourly space velocity) on the catalytic activity were also studied. Under the same experiment conditions, the catalytic activity of Cu/sepiolite was better than that of Cu/ZSM5.
【Fund】: 北京市自然科学基金(8032004)
【CateGory Index】: O643X701
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