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Structural characteristics and redox behaviors of Ce1-xCuxOy solid solutions
Shan, WJ; Shen, WJ; Li, C
Source PublicationCHEMISTRY OF MATERIALS
2003-12-16
DOI10.1021/cm0345974
Volume15Issue:25Pages:4761-4767
Indexed BySCI
SubtypeArticle
Department501
Funding Project501
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Materials Science
WOS KeywordCERIUM OXIDE ; CARBON-MONOXIDE ; CO OXIDATION ; CU/CEO2 CATALYST ; LOW-TEMPERATURES ; SUPPORTED CERIA ; MIXED-OXIDE ; COMBUSTION ; METHANE ; CU
AbstractNanosized Ce1-xCuxOy materials were prepared by complexation-combustion method. The structural characteristics and redox behaviors were investigated using X-ray diffraction (XRD), temperature programmed reduction (H-2-TPR), UV-Vis, and Raman spectroscopies. In XRD patterns, no evidence of CuO diffraction peaks are observed for the Ce1-xCuxOy samples calcinated at 650 degreesC for 5 h, until the Cu/(Ce + Cu) ratio is higher than 0.4. The stepwise decrease of the 2theta value of CeO2 in Ce1-xCuxOy with the increasing of Cu concentration suggests that the CU2+ ions incorporate into the CeO2 lattice to form Ce1-xCuxOy solid solutions for low Cu/(Ce + Cu) ratios (x less than or equal to 0.1). The CuO phase begins to segregate from the solid solutions with the further increasing of Cu/(Ce+Cu) ratio. The Raman mode at 1176 cm(-1) ascribed to the enhanced defects appears for CeO2 and the Ce0.9Cu0.1Oy solid solution. Compared with CeO2 alone, the Raman mode of cubic CeO2 shifts from 462 to 443 cm(-1) for the Ce0.9Cu0.1Oy solid solution. The H-2 consumption of the fresh Ce0.95Cu0.05Oy is 1.65 times higher than that needed to reduce CuO to Cu, and it increases to 2.4 after a reoxidation of the partially reduced Ce0.95Cu0.05Oy at 300 degreesC, which indicates that the CeO2 phase is also extensively reduced. Compared with the high Cu/(Ce+Cu) ratio sample Ce0.7Cu0.3Oy, the Ce0.9Cu0.1Oy solid solution shows high and stable redox property even after different reoxidation temperatures. When the reoxidation temperature exceeds 200 degreesC, the a peak (similar to170 degreesC) ascribed to the reduction of surface oxygen disappears, and the P peak (similar to190 degreesC) ascribed to the reduction of Cu2+ species and the partial reduction of bulk CeO2 shifts to higher temperatures with the H-2 consumption 1.16 times higher than that for fresh sample. The result demonstrates that the redox property of the CeO2 is Significantly improved by forming the Ce1-xCuxOy solid solutions.
Language英语
URL查看原文
WOS IDWOS:000187250800012
Citation statistics
Cited Times:168[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82859
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Shan, WJ,Shen, WJ,Li, C. Structural characteristics and redox behaviors of Ce1-xCuxOy solid solutions[J]. CHEMISTRY OF MATERIALS,2003,15(25):4761-4767.
APA Shan, WJ,Shen, WJ,&Li, C.(2003).Structural characteristics and redox behaviors of Ce1-xCuxOy solid solutions.CHEMISTRY OF MATERIALS,15(25),4761-4767.
MLA Shan, WJ,et al."Structural characteristics and redox behaviors of Ce1-xCuxOy solid solutions".CHEMISTRY OF MATERIALS 15.25(2003):4761-4767.
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