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Soot combustion over Ce1-xFexO2-delta and CeO2/Fe2O3 catalysts: Roles of solid solution and interfacial interactions in the mixed oxides
Li, Hongcheng1,2; Li, Kongzhai1,2; Wang, Hua1,2; Zhu, Xing1,2; Wei, Yonggang1,2; Yan, Dongxia3; Cheng, Xianming1,2; Zhai, Kang1
2016-12-30
发表期刊APPLIED SURFACE SCIENCE
ISSN0169-4332
卷号390期号:DEC页码:513-525
摘要

Two series of CeO2-Fe2O3 catalysts (CeO2-based and Fe2O3-supported oxides) with varying composition were synthesized by a hydrothermal method and characterized using various techniques. The comparison on the activity and thermal stability of different catalysts for low-temperature soot oxidation was also performed. The presence of both Ce-Fe-O solid solution and CeO2-Fe2O3 interaction were observed over the two types of catalysts. The oxygen vacancy in the solid solution is the crucial active site to facilitating the soot combustion over the CeO2-based samples. Small CeO2 nanoparticles are well dispersed on the Fe2O3-supported catalysts, which results in the formation of Fe-O-Ce species due to the strong CeO2-Fe2O interaction. The Fe-O-Ce species could achieve the coupling of the Ce4+-Ce3+ and Fe3+-Fe2+ couples in the CeO2-Fe2O interface, which is also identified as an active species for catalytic soot oxidation. The concentration of oxygen vacancy is closely related to the content of iron in ceria lattice, while the formation of Fe-O-Ce species strongly relies on the particle size of CeO2. It is also found that the oxygen vacancy is more active than the Fe-O-Ce species for soot oxidation, but it is very easy to decompose at high temperature, resulting in obvious deactivation of catalysts. By contrast, the Fe-O-Ce species is very stable under high-temperature treatments. For the fresh samples, the CeO2-based and Fe2O3-supported catalysts showed comparable catalytic activity. After long term aging at 800 degrees C, the loss on activity over the CeO2-based catalyst (Ce-Fe-O solid solution) is much higher than that over the Fe2O3-supported sample. The Fe2O3-supported catalysts are more suitable for practical application than the Ce-Fe-O solid solution. (C) 2016 Elsevier B.V. All rights reserved.

关键词Soot Oxidation Ceo2-fe2o3 Interaction Active Species Activity And Thermal Stability Ceria-based Solid Solution
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apsusc.2016.08.122
收录类别SCI
语种英语
关键词[WOS]OXYGEN STORAGE CAPACITY ; THERMAL-STABILITY ; DIESEL SOOT ; CO OXIDATION ; STRUCTURAL CHARACTERISTICS ; SBA-15 MONOLITH ; FE2O3 CATALYST ; NO OXIDATION ; RARE-EARTHS ; CE
WOS研究方向Chemistry ; Materials Science ; Physics
WOS类目Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
项目资助者National Natural Science Foundation of China(51374004 ; Candidate Talents Training Fund of Yunnan Province(2012HB009 ; Applied Basic Research Program of Yunnan Province(2014FB123) ; school-enterprise cooperation project from Jinchuan Corporation(Jinchuan 201115) ; Talents Training Program of Kunming University of Science and Technology(KKZ3201352038) ; Scientific and Technological Leading Talent Projects in Yunnan Province(2015HA019) ; 51204083) ; 2014HB006)
WOS记录号WOS:000385900700064
引用统计
被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21576
专题研究所(批量导入)
作者单位1.Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China
2.Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Yunnan, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
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Li, Hongcheng,Li, Kongzhai,Wang, Hua,et al. Soot combustion over Ce1-xFexO2-delta and CeO2/Fe2O3 catalysts: Roles of solid solution and interfacial interactions in the mixed oxides[J]. APPLIED SURFACE SCIENCE,2016,390(DEC):513-525.
APA Li, Hongcheng.,Li, Kongzhai.,Wang, Hua.,Zhu, Xing.,Wei, Yonggang.,...&Zhai, Kang.(2016).Soot combustion over Ce1-xFexO2-delta and CeO2/Fe2O3 catalysts: Roles of solid solution and interfacial interactions in the mixed oxides.APPLIED SURFACE SCIENCE,390(DEC),513-525.
MLA Li, Hongcheng,et al."Soot combustion over Ce1-xFexO2-delta and CeO2/Fe2O3 catalysts: Roles of solid solution and interfacial interactions in the mixed oxides".APPLIED SURFACE SCIENCE 390.DEC(2016):513-525.
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