Application of ZrO2-Al2O3 aerogels to catalysts

被引:9
|
作者
Kohama, K
Imai, H
Hirashima, H
Hamada, H
Inaba, M
机构
[1] Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 223, Japan
[2] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 305, Japan
关键词
aerogel; catalyst; ZrO2-Al2O3; selective reduction of NOx;
D O I
10.1023/A:1008620617595
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
ZrO2-Al2O3 aerogels were prepared by hydrolysis of metal alkoxides in alcoholic solutions and supercritical drying in order to obtain an improved de-NOx catalyst with high activity in a wide temperature range. The aerogels have about 20-50% higher activity than the xerogels in the range 300-600 degrees C. The higher activity of aerogels may be attributed to the higher effective gas diffusivity in them, estimated to be about 20-60 times higher than that of the xerogels, because of their high porosity and large pore size. The catalytic activity of aerogels containing 4-10 mol% ZrO2 is more than 20% higher than that of Al2O3 aerogels at temperatures <450 degrees C.
引用
收藏
页码:1033 / 1036
页数:4
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