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《Chinese Journal of Catalysis》 2002-03
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Effect of Water Vapor on Selective Catalytic Reduction of NO by Propylene over Cu-Al-MCM-41

WAN Ying, WANG Zheng, MA Jianxin *, ZHOU Wei, ZHANG Yiqun, WU Minzhong(Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China)  
The temperature programmed reaction and characterization studies were performed over Cu Al MCM 41 to examine the effect of a high concentration of water vapor on the catalyst activity in the selective catalytic reduction of NO by C 3H 6. The presence of 10% water in the feed gas showed a minor inhibition on the activity of the catalyst. Under the dry conditions (0.1% NO, 0.1% C 3H 6, 2.0% O 2 and balanced with N 2), the NO conversion of 37% was obtained at 370 ℃. When the feed gas contained 10% water vapor, the maximum conversion of NO decreased to 34%. Under the dry and wet conditions the catalyst was stable for 300 min reaction at 400 ℃. The characterization of the catalyst by using XRD, N 2 isothermal adsorption, NMR, TPR and TPD techniques revealed that the structure of Cu Al MCM 41 remained unchanged after reaction under the humidified atmosphere, implying that dealumination of the zeolite did not occur. The reason for the activity loss could be attributed both to the inhibition of water on the adsorption of C 3H 6 and NO on the active site, and to the formation of CuO during the reaction resulting in the decrease of the active site.
【Fund】: “跨世纪优秀人才培养计划”基金项目;; 教育部重点科技项目(93 0 3 9)
【CateGory Index】: O643.3
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