Hydrotalcite-Derived MnxMg3-xAlO Catalysts Used for Soot Combustion, NOx Storage and Simultaneous Soot-NOx Removal

被引：57

作者：

Li, Qian ^{[1
]}

Meng, Ming ^{[1
]}

Xian, Hui ^{[1
]}

Tsubaki, Noritatsu ^{[2
]}

Li, Xingang ^{[1
]}

Xie, Yaning ^{[3
]}

Hu, Tiandou ^{[3
]}

Zhang, Jing ^{[3
]}

机构：

[1] Tianjin Univ, Tianjin Key Lab Appl Catalysis Sci & Engn, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Toyama Univ, Sch Engn, Dept Appl Chem, Toyama 9308555, Japan

[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2010年 / 44卷 / 12期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

DIESEL SOOT; OXIDE CATALYSTS; COMGALO CATALYSTS; CARBON-DIOXIDE; ADSORPTION; MN; POTASSIUM; REDUCTION; CO; CU;

D O I：

10.1021/es9033638

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The hydrotalcite-based MnxMg3AlO catalysts with different Mn: Mg atomic ratios were synthesized by coprecipitation, and employed for soot combustion, NOx storage and simultaneous soot-NOx removal. It is shown that with the increase of Mn content in the hydrotalcite-based MnxMg3-xAlO catalysts the major Mn-related species vary from MnAl2O4 and Mg2MnO4 to Mn3O4 and Mn2O3. The catalyst Mn1.5Mg1.5AlO displays the highest soot combustion activity with the temperature for maximal soot combustion rate decreased by 210 degrees C, as compared with the Mn-free catalyst The highly reducible Mn4+ ions in Mg2MnO4 are identified as the most active species for soot combustion. For NOx storage, introduction of Mn greatly influences bulk NOx storage, with the adsorbed NOx species varying from linear nitrites to ionic and chelating bidentate nitrates gradually. The coexistence of highly oxidative Mn4+ and highly reductive Mn2+ in Mn1.0Mg2.0AlO is favorable to the simultaneous soot-NOx removal, giving a NOx reduction percentage of 24%. In situ DRIFTS reveals that the ionic nitrate species are more reactive with soot than nitrites and chelating bidentate nitrates, showing higher NOx reduction efficiency.

引用

页码：4747 / 4752

页数：6

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