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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)
2012
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
Volume121Pages:65-74
AbstractA 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.
KeywordSoot combustion NOx reduction Perovskite Dual substitution Mechanism
Subject AreaChemistry; Engineering
DOI10.1016/j.apcatb.2012.03.022
Indexed BySCI
WOS IDWOS:000305502200008
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/223814
Collection多学科研究中心
Recommended Citation
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.
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