Catalytic selective reduction of NO with propylene over Cu-Al2O3 catalysts:: influence of catalyst preparation method

被引:98
作者
Chen, LY [1 ]
Horiuchi, T [1 ]
Osaki, T [1 ]
Mori, T [1 ]
机构
[1] Natl Ind Res Inst Nagoya, Ceram Technol Dept, Ecoceram Lab, Kita Ku, Nagoya, Aichi 4628510, Japan
关键词
NO reduction with C3H6; copper/alumina; catalyst preparation method;
D O I
10.1016/S0926-3373(99)00084-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
NO reduction to N-2 by C3H6 was investigated and compared over Cu-Al2O3 catalysts prepared by four different methods, namely, the conventional impregnation, co-precipitation, evaporation of a mixed aqueous solution, and xerogel methods. It was found that the catalyst preparation method as well as the Cu content exerts a significant influence on catalyst activity. For the catalysts prepared by the first three preparation methods, with the increase of Cu content from 5 to 15 wt%, the maximum NO reduction conversion decreased slightly, but the temperature for the maximum NO reduction also decreased. For the xerogel Cu-Al2O3, there was a significant decrease in NO reduction conversion with the increase of Cu content from 5 to 10 wt%. In the absence of water vapour, the Cu-Al2O3 catalyst prepared by the impregnation method exhibited the highest activity toward NO reduction. The purity of alumina support was found to be a crucial factor to the activity of the Cu-Al2O3 catalyst prepared by impregnation. Tn the presence of water vapour, a substantial decrease in NO conversion was observed for the Cu-Al2O3 catalysts prepared by the first three methods, especially fur the impregnated Cu-Al2O3 catalyst. In contrast, the presence of water vapour showed only a minor influence on the xerogel 5 wt% Cu-Al2O3 and it showed the highest activity for NO reduction in the presence of 20% water vapour. The xerogel 5 wt% Cu-Al2O3 catalyst was also found to be less affected by a 5 wt% sulfate deposition than the Cu-Al2O3 catalysts prepared by other methods. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:259 / 269
页数:11
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