Lanthanum-promoted copper-based hydrotalcites derived mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal

被引：27

作者：

Wang, Zhongpeng ^{[1
,2
]}

Yan, Xiaotong ^{[1
]}

Bi, Xinlin ^{[1
]}

Wang, Liguo ^{[1
]}

Zhang, Zhaoliang ^{[1
]}

Jiang, Zheng ^{[2
]}

Xiao, Tiancun ^{[2
]}

Umar, Ahmad ^{[3
,4
]}

Wang, Qiang ^{[5
]}

机构：

[1] Univ Jinan, Sch Resources & Environm, Jinan 250022, Peoples R China

[2] Univ Oxford, Inorgan Chem Lab, Oxford OX1 3QR, England

[3] Najran Univ, Dept Chem, Coll Arts & Sci, Najran 11001, Saudi Arabia

[4] Najran Univ, PCSED, Najran 11001, Saudi Arabia

[5] Beijing Forestry Univ, Coll Environm Sci & Engn, Beijing 100083, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 51卷

基金：

中国国家自然科学基金;

关键词：

Layered compounds; Oxides; Chemical synthesis; X-ray diffraction; Catalytic properties; LAYERED DOUBLE HYDROXIDES; SELECTIVE CATALYTIC-REDUCTION; MG-AL HYDROTALCITE; DIESEL SOOT; METAL OXIDES; SURFACE-CHEMISTRY; NITROGEN-OXIDES; OXIDATION; EXHAUST; CARBON;

D O I：

10.1016/j.materresbull.2013.12.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

La-promoted Cu-based hydrotalcites derived mixed oxides were prepared and their catalytic activities for NOx adsorption, soot oxidation, and simultaneous NOx-soot removal were investigated. The catalysts were characterized by XRD, DTG, BET, FTIR, H2-TPR, TPD and TPO techniques. The oxides catalysts exhibited mesoporous properties with specific surface area of 45-160 m(2)/g. The incorporation of La and Cu decreased the amount of basic sites due to the large decrease in surface areas. Under O-2 atmosphere, La incorporation is dominant for soot oxidation activity, while Cu favors high selectivity to CO2 formation. A synergetic effect between La and Cu for catalyzed soot oxidation lies in the improved redox property and suitable basicity. The presence of NO in O-2 significantly promoted soot oxidation on the catalysts with the ignition temperature decreased to about 300 degrees C. In O-2/NO atmosphere, NO2 acts as an intermediate which oxidizes soot to CO2 at a lower temperature with itself reduced to NO or N-2, contributing to the high catalytic performance in simultaneous removal of NOx and soot. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：119 / 127

页数：9

共 37 条

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