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A series of ceria supported lean-burn NOx trap catalysts LaCoO3/K2CO3/CeO2 using perovskite as active component
You, R; Zhang, YX; Liu, DS; Meng, M; Jiang, Z; Zhang, S; Huang, YY
2015
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume260Pages:357—367
Subtype期刊文献
AbstractA series of ceria supported perovskite-based lean-burn NOx trap (LNT) catalysts 10 wt.% LaCoO3/xK(2)CO(3)/CeO2 (denoted as L/xK/C, x = 1, 3, 5, 8 wt.%) were prepared by successive impregnation. They display excellent performance for NOx storage and reduction, especially the one with 3% K2CO3. The formation of supported perovskite LaCoO3 on CeO2 is confirmed by XAFS characterization. The results of XPS and O-2-TPD reveal that the supported perovskite LaCoO3 contains considerable amounts of surface adsorbed oxygen, which are responsible for NO to NO2 oxidation during NOx storage. The catalyst L/3K/C exhibits fast and complete NOx trapping in lean condition, showing little NOx leak for long time, over which a particularly high NOx reduction percentage (97.7%) and NOx to N-2 selectivity (98.5%) are simultaneously achieved in cyclic lean/rich atmospheres. FT-IR and CO2-TPD results demonstrate the diversity of K species including -OK groups, dispersed surface K2CO3 species and bulk or bulk-like K2CO3 species. The dispersion and states of K species show big impact on NOx storage pathways. In situ DRIFTS results indicate that on L/xK/C NOx is stored as diverse nitrates without evident nitrite species detected during NOx adsorption and storage, which further verifies their excellent oxidation ability. (C) 2014 Elsevier B.V. All rights reserved.
KeywordLean/rich Atmospheres Reduction Catalyst Lacoo3 Perovskite Elementary Steps Storage Adsorption Oxides Oxidation Exhaust Pt/k/tio2-zro2
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24385
Collection中科院上海应用物理研究所2011-2020年
Recommended Citation
GB/T 7714
You, R,Zhang, YX,Liu, DS,et al. A series of ceria supported lean-burn NOx trap catalysts LaCoO3/K2CO3/CeO2 using perovskite as active component[J]. CHEMICAL ENGINEERING JOURNAL,2015,260:357—367.
APA You, R.,Zhang, YX.,Liu, DS.,Meng, M.,Jiang, Z.,...&Huang, YY.(2015).A series of ceria supported lean-burn NOx trap catalysts LaCoO3/K2CO3/CeO2 using perovskite as active component.CHEMICAL ENGINEERING JOURNAL,260,357—367.
MLA You, R,et al."A series of ceria supported lean-burn NOx trap catalysts LaCoO3/K2CO3/CeO2 using perovskite as active component".CHEMICAL ENGINEERING JOURNAL 260(2015):357—367.
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