Simultaneous catalytic removal of NOx and soot particulate over Co-Al mixed oxide catalysts derived from hydrotalcites

被引：60

作者：

Wang, Zhongpeng ^{[1
]}

Jiang, Zhi ^{[1
]}

Shangguan, Wenfeng ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Res Ctr Combust & Environm Technol, Shanghai 200240, Peoples R China

来源：

CATALYSIS COMMUNICATIONS | 2007年 / 8卷 / 11期

基金：

中国博士后科学基金;

关键词：

hydrotalcites; mixed oxides; NOx; soot; simultaneous removal;

D O I：

10.1016/j.catcom.2007.01.025

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：

Co-Al mixed oxides (CAO) was prepared by co-precipitation method from hydrotalcites (HT) as precursors, and their catalytic activity was investigated for the simultaneously catalytic removal of NO, and diesel soot particulates by the temperature-programmed reaction (TPR) technique. All HT samples present well crystallized, layered structures, no excess phases were detected. A nonstoichiometric spinet phase was formed by calcining the CAO at 500 degrees C and 800 degrees C, irrespective of the Co/Al ratio. Both the activity of soot oxidation and the selectivity to N-2 formation of CAO catalysts calcined at 800 degrees C were higher than that at 500 degrees C. The observed difference in the catalytic performance was related to the redox properties of the catalysts and the crystallite size of HT precursors. The active species might come from Co3O4, which acted for redox-type mechanism for soot oxidation in the NOx-soot reaction. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1659 / 1664

页数：6

共 33 条

[1] HYDROTALCITE-TYPE ANIONIC CLAYS: PREPARATION, PROPERTIES AND APPLICATIONS [J].

Cavani, F. ;

Trifiro, F. ;

Vaccari, A. .

CATALYSIS TODAY, 1991, 11 (02) :173-301

[2] Catalytic activity of Co-Mg-Al, Cu-Mg-Al and Cu-Co-Mg-Al mixed oxides derived from hydrotalcites in SCR of NO with ammonia [J].

Chmielarz, L ;

Kustrowski, P ;

Rafalska-Lasocha, A ;

Majda, D ;

Dziembaj, R .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2002, 35 (03) :195-210

[3] Simultaneous catalytic removal of SOx and NOx with hydrotalcite-derived mixed oxides containing copper, and their possibilities to be used in FCC units [J].

Corma, A ;

Palomares, AE ;

Rey, F ;

Marquez, F .

JOURNAL OF CATALYSIS, 1997, 170 (01) :140-149

[4] Applications of layered double hydroxides [J].

Feng, L ;

Duan, X .

LAYERED DOUBLE HYDROXIDES, 2006, 119 :193-223

[5] Studies on kinetics and reactions mechanism of La2-xKxCu1-yVyO4 layered perovskites for the combined removal of diesel particulate and NOx [J].

Fino, D ;

Fino, P ;

Saracco, G ;

Specchia, V .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 43 (03) :243-259

[6] Cobalt catalysts for the oxidation of diesel soot particulate [J].

Harrison, PG ;

Ball, IK ;

Daniell, W ;

Lukinskas, P ;

Céspedes, M ;

Miró, EE ;

Ulla, MA .

CHEMICAL ENGINEERING JOURNAL, 2003, 95 (1-3) :47-55

[7] Potassium promoted iron oxide catalysts for simultaneous catalytic removal of nitrogen oxides and soot from diesel exhaust gas [J].

Hizbullah, K ;

Kureti, S ;

Weisweiler, W .

CATALYSIS TODAY, 2004, 93-5 :839-843

[8] Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites [J].

Jiang, Z ;

Hao, ZP ;

Yu, JJ ;

Hou, HX ;

Hu, C ;

Su, JX .

CATALYSIS LETTERS, 2005, 99 (3-4) :157-163

[9] Catalytic decomposition of nitrous oxide over calcined cobalt aluminum hydrotalcites [J].

Kannan, S ;

Swamy, CS .

CATALYSIS TODAY, 1999, 53 (04) :725-737

[10] Simultaneous conversion of nitrogen oxides and soot into nitrogen and carbon dioxide over iron containing oxide catalysts in diesel exhaust gas [J].

Kureti, S ;

Weisweiler, W ;

Hizbullah, K .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 43 (03) :281-291

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