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Performance of Ce substituted hydrotalcite-derived mixed oxide catalysts Co2.5Mg0.5Al1-x%Cex%O used for soot combustion and simultaneous NOx-soot removal
Dai, FF; Meng, M; Zha, YQ; Li, ZQ; Hu, TD; Xie, YN; Zhang, J;胡天斗; Xie YN(谢亚宁); Zhang J(张静)
2012
Source PublicationFUEL PROCESSING TECHNOLOGY
Volume104Pages:43-49
AbstractThe Co2.5Mg0.5Al1-x%Cex%O hydrotalcite-derived catalysts (CMACex) with different Ce/AI atomic ratios were synthesized by co-precipitation, which simultaneously possess multiple properties for soot combustion, lean-burn NOx storage and simultaneous NOx-soot removal. The techniques including XRD, EXAFS, BET, H-2-TPR, O-2-TPD and in-situ DRIFTS were used for catalyst characterization. It is found that Ce-substituted catalysts are much more active than Ce-free one for soot combustion. NOx storage and simultaneous NOx-soot removal. Among the catalysts containing Ce. CMACe8 exhibits the highest performance, showing the lowest temperature of 384 degrees C for the maximal soot oxidation rate (T-m), the largest NOx storage capacity (336 mu mol g(-1)), and the largest NOx reduction percentage of 15.4%. Compared with Ce-free sample. Ce-substitution increases the specific surface area, the redox properties and the amount of surface lattice oxygen species of the catalyst. The optimal Ce-substitution amount in Co2.5Mg0.5Al1-x%Cex%O is x=8. In-situ DRIFTS results reveal that NO is readily oxidized to NO2 and stored as nitrates over Ce-substituted catalysts, which are very reactive intermediates for simultaneous NOx-soot removal. (C) 2012 Elsevier B.V. All rights reserved.
KeywordHydrotalcite Cerium Soot combustion NOx reduction by soot
Subject AreaChemistry; Energy & Fuels; Engineering
DOI10.1016/j.fuproc.2012.07.002
Indexed BySCI
WOS IDWOS:000310411500007
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/223786
Collection多学科研究中心
Recommended Citation
GB/T 7714
Dai, FF,Meng, M,Zha, YQ,et al. Performance of Ce substituted hydrotalcite-derived mixed oxide catalysts Co2.5Mg0.5Al1-x%Cex%O used for soot combustion and simultaneous NOx-soot removal[J]. FUEL PROCESSING TECHNOLOGY,2012,104:43-49.
APA Dai, FF.,Meng, M.,Zha, YQ.,Li, ZQ.,Hu, TD.,...&张静.(2012).Performance of Ce substituted hydrotalcite-derived mixed oxide catalysts Co2.5Mg0.5Al1-x%Cex%O used for soot combustion and simultaneous NOx-soot removal.FUEL PROCESSING TECHNOLOGY,104,43-49.
MLA Dai, FF,et al."Performance of Ce substituted hydrotalcite-derived mixed oxide catalysts Co2.5Mg0.5Al1-x%Cex%O used for soot combustion and simultaneous NOx-soot removal".FUEL PROCESSING TECHNOLOGY 104(2012):43-49.
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