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NOx-assisted soot combustion over dually substituted perovskite catalysts La1-xKxCo1-yPdyO3-delta
Guo, Xin; Meng, Ming; Dai, Fangfang; Li, Qian; Zhang, Zhaoliang; Jiang, Zheng; Zhang, Shuo; Huang, Yuying
2013
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume142Pages:CONCATENATE(Sheet1!I236,-Sheet1!J236)
AbstractA series of dually substituted perovskite catalysts La1-xKxCo1-yPdyO3-delta (x=0, 0.1; y=0, 0.05) were successfully synthesized through a citrate-based sol-gel process, and employed for soot combustion in the presence of NOx. The physicochemical properties of them were systematically characterized by N-2-sorption, XRD, XPS, SEM, HRTEM, XANES, EXAFS, H-2-TPR, soot-TPR, FT-IR and TG/DTA. The activity evaluation results show that among all catalysts La0.9K0.1Co0.95Pd0.05O3-delta possesses the highest performance, exhibiting the lowest T-i and T-m (219 degrees C and 360 degrees C), the narrowest temperature range (T-f - T-i = 162 degrees C) and the lowest activation energy (93.6 kJ/mol) for soot combustion. The catalyst La0.9K0.1Co0.95Pd0.05O3-delta shows relatively larger BET surface area, smaller crystallite size and higher dispersion of Pd. Additionally, this catalyst also possesses the best reducibility and highest oxidibility as revealed by H-2-TPR and soot-TPR. The Pd ions with high valence (Pd3+, Pd4+) in distorted octahedral coordination environment as demonstrated by XPS, XANES and EXAFS are much more active for NO oxidation and soot combustion than the bivalent Pd ions with square-planar coordination symmetry. Based upon the characterization results and catalytic performance, a mechanism containing two reaction pathways namely direct soot oxidation by surface adsorbed oxygen species in oxygen vacancies and the NO2-assisted soot oxidation is proposed. (c) 2013 Elsevier B.V. All rights reserved.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000324077600031
Citation statistics
Cited Times:72[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13841
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Guo, Xin,Meng, Ming,Dai, Fangfang,et al. NOx-assisted soot combustion over dually substituted perovskite catalysts La1-xKxCo1-yPdyO3-delta[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2013,142:CONCATENATE(Sheet1!I236,-Sheet1!J236).
APA Guo, Xin.,Meng, Ming.,Dai, Fangfang.,Li, Qian.,Zhang, Zhaoliang.,...&Huang, Yuying.(2013).NOx-assisted soot combustion over dually substituted perovskite catalysts La1-xKxCo1-yPdyO3-delta.APPLIED CATALYSIS B-ENVIRONMENTAL,142,CONCATENATE(Sheet1!I236,-Sheet1!J236).
MLA Guo, Xin,et al."NOx-assisted soot combustion over dually substituted perovskite catalysts La1-xKxCo1-yPdyO3-delta".APPLIED CATALYSIS B-ENVIRONMENTAL 142(2013):CONCATENATE(Sheet1!I236,-Sheet1!J236).
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