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Comparative Study of CeO2 and Doped CeO2 with Tailored Oxygen Vacancies for CO Oxidation
Alternative TitleChemPhysChem
Wang, Zhen1; Wang, Qi2; Liao, Yuchao1; Shen, Genli1; Gong, Xuzhong; Han, Ning1; Liu, Haidi1; Chen, Yunfa1
2011-10-24
Source PublicationCHEMPHYSCHEM
ISSN1439-4235
Volume12Issue:15Pages:2763-2770
AbstractWe report on the preparation and characterization of CeO2 nanofibers (CeO2-NFs) and nanocubes (CeO2-NCs), as well as Sm-and Gd-doped CeO2 nanocubes (Sm-CeO2-NCs and Gd-CeO2-NCs), synthesized by a simple hydrothermal process for CO catalytic oxidation. The samples were characterized by Xray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman spectroscopy, and photoluminescence spectroscopy. Their oxygen-storing capacity (OSC) was examined by means of hydrogen temperature-programmed reduction (H-2-TPR) and oxygen pulse techniques. Their catalytic properties for CO catalytic oxidation were comparatively investigated. The results showed that the CeO2-NFs possessed a higher catalytic activity compared to the CeO2-NCs because of their smaller size and the greater number of oxygen vacancies. The activity of the Sm-CeO2-NCs was higher than that of the CeO2-NCs due to an increase in the number of oxygen vacancies, which results from the substitution of Ce4+ species with Sm3+ ions. In contrast, Gd doping had a negative effect on the CO catalytic oxidation due to the special electron configuration of Gd3+ (4f(7)). Our work demonstrates that the oxygen vacancies in pure CeO2 and the electron configuration of the dopants in doped CeO2 play an important role in CO oxidation.; We report on the preparation and characterization of CeO2 nanofibers (CeO2-NFs) and nanocubes (CeO2-NCs), as well as Sm-and Gd-doped CeO2 nanocubes (Sm-CeO2-NCs and Gd-CeO2-NCs), synthesized by a simple hydrothermal process for CO catalytic oxidation. The samples were characterized by Xray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman spectroscopy, and photoluminescence spectroscopy. Their oxygen-storing capacity (OSC) was examined by means of hydrogen temperature-programmed reduction (H-2-TPR) and oxygen pulse techniques. Their catalytic properties for CO catalytic oxidation were comparatively investigated. The results showed that the CeO2-NFs possessed a higher catalytic activity compared to the CeO2-NCs because of their smaller size and the greater number of oxygen vacancies. The activity of the Sm-CeO2-NCs was higher than that of the CeO2-NCs due to an increase in the number of oxygen vacancies, which results from the substitution of Ce4+ species with Sm3+ ions. In contrast, Gd doping had a negative effect on the CO catalytic oxidation due to the special electron configuration of Gd3+ (4f(7)). Our work demonstrates that the oxygen vacancies in pure CeO2 and the electron configuration of the dopants in doped CeO2 play an important role in CO oxidation.
KeywordCeria Co Oxidation Doping Gadolinium Samarium
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/cphc.201100346
URL查看原文
Indexed BySCI
Language英语
WOS KeywordENHANCED CATALYTIC-ACTIVITY ; CERIUM OXIDE NANOPARTICLES ; SOLID-SOLUTIONS ; STRUCTURAL CHARACTERISTICS ; ELECTRONIC-STRUCTURE ; RAMAN-SPECTRA ; NANORODS ; BEHAVIOR ; FILMS ; SIZE
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS IDWOS:000297017600014
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Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6281
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Grad Univ, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing, Peoples R China
2.Natl Ctr Nanosci & Technol, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhen,Wang, Qi,Liao, Yuchao,et al. Comparative Study of CeO2 and Doped CeO2 with Tailored Oxygen Vacancies for CO Oxidation[J]. CHEMPHYSCHEM,2011,12(15):2763-2770.
APA Wang, Zhen.,Wang, Qi.,Liao, Yuchao.,Shen, Genli.,Gong, Xuzhong.,...&Chen, Yunfa.(2011).Comparative Study of CeO2 and Doped CeO2 with Tailored Oxygen Vacancies for CO Oxidation.CHEMPHYSCHEM,12(15),2763-2770.
MLA Wang, Zhen,et al."Comparative Study of CeO2 and Doped CeO2 with Tailored Oxygen Vacancies for CO Oxidation".CHEMPHYSCHEM 12.15(2011):2763-2770.
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