Structure, acidity and activity of CuOx/WOx-ZrO2 catalyst for selective catalytic reduction of NO by NH3

被引：146

作者：

Si, Zhichun ^{[1
]}

Weng, Duan ^{[1
]}

Wu, Xiaodong ^{[1
]}

Li, Jia ^{[1
]}

Li, Guo ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2010年 / 271卷 / 01期

关键词：

NH3-SCR; CuOx/WOx-ZrO2; Low-temperature; Reaction route; LOW-TEMPERATURE; NITRIC-OXIDE; MECHANISTIC ASPECTS; SCR CATALYSTS; EXCESS O-2; AMMONIA; ZIRCONIA; COPPER; UREA; CHEMISTRY;

D O I：

10.1016/j.jcat.2010.01.025

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：

A series of CuOx/WOx-ZrO2 catalysts were synthesized by impregnating different amounts of copper on the coprecipitated WOx-ZrO2 support and were characterized by XRD, BET, XPS, NH3/NO chemisorption, NH3-TPO and NH3-SCR activity measurements. A wide temperature range (200-320 degrees C) in which NO conversion exceeds 80% is achieved on the 10 wt.% CuOx/WOx-ZrO2 catalyst. The activity and selectivity of the catalysts for ammonia oxidation and NH3-SCR reaction are determined by the strength and amount of Lewis acid sites and Bronsted acid sites, which are adjusted by the formation of WOx-ZrO2 solid solutions and the addition of copper oxides. Two different reaction routes, "ammonia-NO2 route" at low temperatures (<200 degrees C) and "amine-NO/NO2" at high temperatures (>250 degrees C), are presented for SCR reaction over CuOx/WOx-ZrO2 catalysts. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：43 / 51

页数：9

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