Enhancement of low-temperature activity over Cu-exchanged zeolite beta from organotemplate-free synthesis for the selective catalytic reduction of NO with NH3 in exhaust gas streams

被引：42

作者：

Xu, Li ^{[1
]}

Shi, Chuan ^{[1
]}

Zhang, Zhaoshun ^{[1
]}

Gies, Hermann ^{[2
]}

Xiao, Feng-Shou ^{[3
]}

De Vos, Dirk ^{[4
]}

Yokoi, Toshiyuki ^{[5
]}

Bao, Xinhe ^{[6
]}

Feyen, Mathias ^{[7
]}

Maurer, Stefan ^{[7
]}

Yilmaz, Bilge ^{[8
]}

Mueller, Ulrich ^{[7
]}

Zhang, Weiping ^{[1
]}

机构：

[1] Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem, Dalian 116024, Peoples R China

[2] Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Bochum, Germany

[3] Zhejiang Univ, Dept Chem, Hangzhou 310028, Zhejiang, Peoples R China

[4] Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, Leuven, Belgium

[5] Tokyo Inst Technol, Chem Resources Lab, Yokohama, Kanagawa 227, Japan

[6] Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[7] BASF SE, D-67056 Ludwigshafen, Germany

[8] BASF Corp, Chem Res & Engn, Iselin, NJ 08830 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2014年 / 200卷

基金：

中国国家自然科学基金;

关键词：

Organotemplate-free Beta zeolite; Cu-Beta catalyst; NH3-SCR; H-2-TPR; CO-FTIR; DIESEL-ENGINE; AMMONIA; SITES; SCR; CU/SAPO-34; CU-SSZ-13; CU-ZSM-5; ROUTE; IONS; FTIR;

D O I：

10.1016/j.micromeso.2014.04.034

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of Cu-exchanged Al-rich Beta zeolites from organotemplate-free synthesis was prepared and investigated for selective catalytic reduction (SCR) of NOx with NH3 in exhaust gas streams. In comparison to conventional Cu-Beta zeolite with Si/Al ratio of 19, Cu-Beta zeolite with Si/Al ratio of 4 is a superior low-temperature NH3-SCR catalyst. Very high NO conversion (>95%) can be achieved at temperatures as low as 150 to similar to 400 degrees C. XRD, UV-Vis-NIR and NH3-TPD measurements show that more isolated Cu2+ ions are present at the exchange sites of Al-rich Beta zeolite. The combination of CO-FTIR and H-2-TPR analysis demonstrates that Cu2+ ions could be reduced more readily on the Al-rich Beta than on the conventional Beta probably due to the proximity of the isolated Cu2+ ions. These can be correlated to the enhancement of NO conversion at lower temperatures over Cu-exchanged Al-rich Beta zeolite. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：304 / 310

页数：7

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