A comparative study of Ag/Al2O3 and Cu/Al2O3 catalysts for the selective catalytic reduction of NO byC3H6

被引：70
|
作者：
He, H [1 ]
Zhang, CB [1 ]
Yu, YB [1 ]
机构：
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
来源：
CATALYSIS TODAY | 2004年 / 90卷 / 3-4期
关键词：
enolic species; selective catalytic reduction of NO (SCR of NO); in situ DRIFT'S; reaction mechanism;
D O I：
10.1016/j.cattod.2004.04.026
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The selective catalytic reduction (SCR) of NO by C3H6 in excess oxygen was evaluated and compared over Ag/Al2O3 and Cu/Al2O3 catalysts. Ag/Al2O3 showed a high activity for NO reduction. However, Cu/Al2O3 showed a high activity for C3H6 oxidation. The partial oxidation of C3H6 gave surface enolic species and acetate species on the Ag/Al2O3, but only an acetate species was clearly observed on the Cu/Al2O3. The enolic species is a more active intermediate towards NO + O-2 to yield-NCO species than the acetate species on the Ag/Al2O3 catalyst. The Ag and Cu metal loadings and phase changes on Al2O3 support can affect the activity and selectivity of Ag/Al2O3 and Cu/Al2O3 catalysts, but the formation of enolic species is the main reason why the activity of the Ag/Al2O3 catalyst for NO reduction is higher than that of the Cu/Al2O3 catalyst. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：191 / 197
页数：7
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