Enhanced soot combustion over partially substituted hydrotalcite-drived mixed oxide catalysts CoMgAlLaO
Dai, FF; Zhang, YX; Meng, M; Zhang, J; Zheng, LR; Hu, TD;张静; Zheng LR(郑黎荣); Hu TD(胡天斗)
刊名JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
2014
卷号393页码:68-74
关键词Hydrotalcite Lanthanum Soot combustion Nitrate Mechanism
学科分类Chemistry
DOI10.1016/j.molcata.2014.05.031
英文摘要A series of hydrotalcite-derived multicomponent oxide catalysts Co2.5Mg0.5Al1-x%La-x%O (denoted as CMALa(x), x=0, 5, 8, 10 or 15) with different La contents were synthesized by co-precipitation, and employed for catalytic soot combustion and NOx storage at lean condition. It is found that the La-substituted catalysts are more active than the one without La for soot combustion and NOx storage. Among all the catalysts CMALa(x), CMALa(10) (x=10) exhibits the highest catalytic performance, showing the largest NOx storage capacity (300 mu mol/g) and the lowest temperature for the maximal soot oxidation rate (T-m = 388 degrees C). The results of H-2-TPR and O-2-TPD indicate that the La-substitution can enhance the redox properties and increase the amount of surface lattice oxygen species of the catalysts. The results of soot combustion kinetics show that the apparent activation energy of CMALa(10) is the lowest (92.75 kJ/mol). Based upon the catalytic performance and in situ DRIFTS characterization, a nitrate and/or NO2 enhanced soot combustion mechanism over CMALa(10) was proposed. It is revealed that at low temperature the stored nitrate can directly promote soot ignition, while at high temperature the NO2 species arising from NO oxidation or nitrate decomposition act as the main active species for soot combustion. (C) 2014 Elsevier B.V. All rights reserved.
收录类别SCI
WOS记录号WOS:000341462700009
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225118
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
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Dai, FF,Zhang, YX,Meng, M,et al. Enhanced soot combustion over partially substituted hydrotalcite-drived mixed oxide catalysts CoMgAlLaO[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2014,393:68-74.
APA Dai, FF.,Zhang, YX.,Meng, M.,Zhang, J.,Zheng, LR.,...&胡天斗.(2014).Enhanced soot combustion over partially substituted hydrotalcite-drived mixed oxide catalysts CoMgAlLaO.JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,393,68-74.
MLA Dai, FF,et al."Enhanced soot combustion over partially substituted hydrotalcite-drived mixed oxide catalysts CoMgAlLaO".JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 393(2014):68-74.
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