Highly efficient multifunctional dually-substituted perovskite catalysts La1-xKxCo1-yCuyO3-delta used for soot combustion, NOx storage and simultaneous NOx-soot removal

	Highly efficient multifunctional dually-substituted perovskite catalysts La1-xKxCo1-yCuyO3-delta used for soot combustion, NOx storage and simultaneous NOx-soot removal
	Li, ZQ; Meng, M; Zha, YQ; Dai, FF; Hu, TD; Xie, YN; Zhang, J; Hu TD(胡天斗); Xie YN(谢亚宁); Zhang J(张静)
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2012
卷号	121 页码:65-74
关键词	Soot combustion NOx reduction Perovskite Dual substitution Mechanism
英文摘要	A series K/Cu simultaneously substituted nanometric perovskite catalysts La1-xKxCo1-yCuyO3-delta (x = 0, 0.1; y = 0, 0.05, 0.1, 0.2, 0.3) were synthesized by citric acid complexation, which were employed for soot combustion, NOx storage and simultaneous NOx-soot removal. The physico-chemical properties of the catalysts were characterized by XRD, FT-IR, EXAFS, SEM, H-2-TPR, Soot-TPR, TG/DTA, XPS and in situ DRIFTS techniques. When K and Cu are simultaneously introduced into LaCoO3, soot combustion is largely accelerated, decreasing the characteristic temperature (T-m) corresponding to the maximal soot combustion rate at least 80 degrees C; moreover, NOx reduction by soot is also remarkably facilitated. Among all the catalysts La0.9K0.1Co0.9Cu0.1O3-delta shows the lowest T-m of 360 degrees C, the highest NOx storage capacity (NSC) of 284 mu mol g(-1) and the largest NOx reduction percentage of 32%; for soot combustion, it also exhibits the lowest activation energy (80.04 kJ mol(-1)). The XPS and Soot-TPR results reveal that the catalyst La0.9K0.1Co0.9Cu0.1O3-delta possesses more active and larger amount of surface oxygen species (O-2(-) and O-), more tetravalent cobalt ions and better reducibility than others, which determines its better catalytic performance. Based on in situ DRIFTS and other characterization results, the potential mechanisms for soot combustion, NOx storage and simultaneous NOx-soot removal are proposed. (c) 2012 Elsevier B.V. All rights reserved.
学科主题	Chemistry; Engineering
收录类别	SCI
WOS记录号	WOS:000305502200008
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/223814]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Li, ZQ,Meng, M,Zha, YQ,et al. Highly efficient multifunctional dually-substituted perovskite catalysts La1-xKxCo1-yCuyO3-delta used for soot combustion, NOx storage and simultaneous NOx-soot removal[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2012,121:65-74.
APA	Li, ZQ.,Meng, M.,Zha, YQ.,Dai, FF.,Hu, TD.,...&张静.(2012).Highly efficient multifunctional dually-substituted perovskite catalysts La1-xKxCo1-yCuyO3-delta used for soot combustion, NOx storage and simultaneous NOx-soot removal.APPLIED CATALYSIS B-ENVIRONMENTAL,121,65-74.
MLA	Li, ZQ,et al."Highly efficient multifunctional dually-substituted perovskite catalysts La1-xKxCo1-yCuyO3-delta used for soot combustion, NOx storage and simultaneous NOx-soot removal".APPLIED CATALYSIS B-ENVIRONMENTAL 121(2012):65-74.