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A Highly Active and Stable Non-Platinic Lean NOx Trap Catalyst MnOx-K2CO3/K2Ti8O17 with Ultra-Low NOx to N2O Selectivity
Zhang, YX; Liu, DS; Meng, M; Jiang, Z; Zhang, S; mengm@tju.edu.cn
2014
Source PublicationINDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN0888-5885
Volume53Issue:20Pages:8416—8425
AbstractA non-platinic lean NOx trap catalyst MnOx-K2CO3/K2Ti8O17 (K2CO3 loading: 25 wt %) was prepared via successive impregnation, which exhibits a large NOx storage capacity (3.21 mmol/g), a high NOx reduction percentage (98.5%) and an ultralow selectivity of NOx to N2O (0.3%). The catalyst was characterized by multiple techniques including XRD, SEM/HRTEM, EXAFS, FT-IR, CO2-TPD and in situ DRIFTS. Except for K2O, -OK groups, surface K2CO3 and bulk or bulk-like K2CO3, an unknown titanate phase with a K/Ti atomic ratio higher than 2/8 is identified, which is also active and regenerative for NOx storage and reduction. In-situ DRIFTS results reveal that NOx is mainly stored as bidentate nitrates and bidentate nitrite species in the catalyst. The appearance of negative bands around 1555 and 1575 cm(-1) (C=O stretching vibration in bidentate carbonates) suggests the involvement of carbonates in NOx storage. Based upon the characterization results, a carbonate-involved NOx storage/reduction mechanism was proposed.
KeywordStorage-reduction Perovskite Catalyst Soot Combustion Diesel Exhaust Nsr Catalysts Support Regeneration Performance Storage/reduction Oxidation
Indexed BySCI
Language英语
WOS IDWOS:000336417700012
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13993
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authormengm@tju.edu.cn
Recommended Citation
GB/T 7714
Zhang, YX,Liu, DS,Meng, M,et al. A Highly Active and Stable Non-Platinic Lean NOx Trap Catalyst MnOx-K2CO3/K2Ti8O17 with Ultra-Low NOx to N2O Selectivity[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2014,53(20):8416—8425.
APA Zhang, YX,Liu, DS,Meng, M,Jiang, Z,Zhang, S,&mengm@tju.edu.cn.(2014).A Highly Active and Stable Non-Platinic Lean NOx Trap Catalyst MnOx-K2CO3/K2Ti8O17 with Ultra-Low NOx to N2O Selectivity.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,53(20),8416—8425.
MLA Zhang, YX,et al."A Highly Active and Stable Non-Platinic Lean NOx Trap Catalyst MnOx-K2CO3/K2Ti8O17 with Ultra-Low NOx to N2O Selectivity".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 53.20(2014):8416—8425.
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