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Carbonates-based noble metal-free lean NOx trap catalysts MOx-K2CO3/K2Ti8O17 (M = Ce, Fe, Cu, Co) with superior catalytic performance
Zhang, YX; You, R; Liu, DS; Liu, C; Li, XG; Tian, Y; Jiang, Z; Zhang, S; Huang, YY; Zha, YQ; Meng, M; You, R (reprint author), Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China.
2015
Source PublicationAPPLIED SURFACE SCIENCE
ISSN0169-4332
Volume357Pages:2260—2276
Subtype期刊文献
AbstractA series of base metal-based lean NO trap (LNT) catalysts MOx-K2CO3/K2Ti8O17 (M = Ce, Fe, Cu, Co) were synthesized by successive impregnations and employed for the storage and reduction of NOx in the emissions of lean-burn engines at 350 degrees C. The XRD and XANES/EXAFS results reveal that the active phases in the corresponding catalysts exist as CeO2, Fe2O3, CuO and Co3O4, respectively. Among all the catalysts, CoOx-K2CO3/K2Ti8O17 exhibits the best performance, which cannot only trap the NOx quickly and completely at lean condition, giving the highest storage capacity (3.32 mmol/g) reported so far, but also reduce the NOx, at rich condition, showing a NOx, reduction percentage as high as 99.0%. Meanwhile, this catalyst displays an ultralow NOx, to N2O selectivity (0.3%) during NOx, reduction. The excellent performance of CoOx-K2CO3/K2Ti8O17 results from its largest amount of surface active oxygen species as revealed by XPS, O-2-TPD and NO-TPD. HRTEM, FT-IR and CO2-TPD results illustrate that several kinds of K species such as OK groups, K2O, surface carbonates and bulk or bulk-like carbonates coexist in the catalysts. Based upon the in situ DRIFTS results, the participation of K2CO3 in NOx, storage is confirmed, and the predominant NOx, storage species is revealed as bidentate nitrites formed via multiple kinetic pathways. The low cost and high catalytic performance of the CoOx-based LNT catalyst make it most promising for the substitution of noble metal-based LNT catalysts. C) 2015 Elsevier B.V. All rights reserved.
KeywordStorage-reduction Catalysts Soot Combustion Diesel Exhaust Mixed Oxides Nh3 Xps Storage/reduction Adsorption Stability Oxidation
Indexed BySCI
Language英语
WOS IDWOS:000366219700122
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24879
Collection中科院上海应用物理研究所2011-2019年
Corresponding AuthorYou, R (reprint author), Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, YX,You, R,Liu, DS,et al. Carbonates-based noble metal-free lean NOx trap catalysts MOx-K2CO3/K2Ti8O17 (M = Ce, Fe, Cu, Co) with superior catalytic performance[J]. APPLIED SURFACE SCIENCE,2015,357:2260—2276.
APA Zhang, YX.,You, R.,Liu, DS.,Liu, C.,Li, XG.,...&You, R .(2015).Carbonates-based noble metal-free lean NOx trap catalysts MOx-K2CO3/K2Ti8O17 (M = Ce, Fe, Cu, Co) with superior catalytic performance.APPLIED SURFACE SCIENCE,357,2260—2276.
MLA Zhang, YX,et al."Carbonates-based noble metal-free lean NOx trap catalysts MOx-K2CO3/K2Ti8O17 (M = Ce, Fe, Cu, Co) with superior catalytic performance".APPLIED SURFACE SCIENCE 357(2015):2260—2276.
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