期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 91, 期 1-2, 页码 406-415出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2009.06.007
关键词
Soot; NOx; Hydrotalcite-derived CoMgAlO catalysts; Potassium; Calcination temperature
资金
- National Natural Science Foundation of China [20876110, 20676097]
- Ministry of Science and Technology of China [2008AA06Z323, 2006AA06Z348]
- Program of New Century Excellent Talents in University of China [NCET-07-0599]
- Natural Science Foundation of Tianjin [07JCYBJCI 5100]
- Cheung Kong Scholar Program for Innovative Teams of the Ministry of Education [IRT0641]
- Program of Introducing Talents of Discipline to University of China [B06006]
A series of K-promoted hydrotalcite-derived CoMgAlO catalysts were synthesized by coprecipitation. Their catalytic performance for soot combustion, NOx storage and simultaneous soot-NOx removal was evaluated, respectively. The techniques of TG/DTA, BET, XRD, EXAFS, XPS and in situ DRIFTS were employed for catalyst characterization. When K is added to the catalyst CoMgAlO, soot combustion is largely accelerated, with the temperature (T-m) for maximum soot conversion lowered by at least 50 degrees C. Moreover, the NOx reduction by soot over the catalysts calcined at 500-700 degrees C is also facilitated. The K-containing catalyst calcined at 600 degrees C shows not only the highest soot combustion rate, but also the maximum NOx reduction percentage of 32%, which is attributed to its high surface K/Co atomic ratio and the strong interaction between K and Co. In situ DRIFTS results reveal that NO is readily oxidized to NO2 and stored as nitrates over K-promoted catalysts, which could be reduced by soot more efficiently. Based on these investigations, a reaction pathway for soot combustion, NOx storage and simultaneous soot-NOx removal is proposed. (C) 2009 Elsevier B.V. All rights reserved.
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