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Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalyst
Wang, Lihua; Yi, Xiaodong; Weng, Weizheng; Zhang, Chunxi; Xu, Xin; Wan, Huilin
2007-10-01
Source PublicationCATALYSIS LETTERS
ISSN1011-372X
Volume118Issue:3-4Pages:238-243
AbstractBy using the in situ IR spectroscopy, the superoxide species (O (2) over bar), characterized by the O-O stretching peak at 1130 cm(-1), was detected on the SrF2/La2O3 catalyst at temperatures up to 973 K. The introduction of O-18(2) isotope caused the 1130 cm(-1) peak to shift to lower wavenumber (1095 and 1064 cm(-1)), consistent with the assignment of the spectra to the superoxide species. A good correlation between the rate of the disappearance of the O (2) over bar species and that of the formation of C2H4 was observed, suggesting that O (2) over bar was the active oxygen species responsible for the oxidative coupling of methane (OCM) on the SrF2/La2O3 catalyst. This conclusion was reinforced by the EPR experiments (g(xx) = 2.0001, g(yy) = 2.0045, g(zz) = 2.0685), showing that O (2) over bar was the only paramagnetic oxygen species detectable on the O-2-preadsorbed SrF2/La2O3 catalyst. These results suggest that superoxide O (2) over bar can be a stable active oxygen species. whose role in the OCM reaction cannot be overlooked.
KeywordIsotopic Oxygen Exchange In Situ Ir Epr Superoxide Species Methane Oxidative Coupling
DOI10.1007/s10562-007-9176-8
Indexed BySCI
Language英语
WOS IDWOS:000249780100012
PublisherSPRINGER
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62510
Collection中国科学院化学研究所
Corresponding AuthorXu, Xin
Affiliation1.Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
2.Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China
3.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wang, Lihua,Yi, Xiaodong,Weng, Weizheng,et al. Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalyst[J]. CATALYSIS LETTERS,2007,118(3-4):238-243.
APA Wang, Lihua,Yi, Xiaodong,Weng, Weizheng,Zhang, Chunxi,Xu, Xin,&Wan, Huilin.(2007).Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalyst.CATALYSIS LETTERS,118(3-4),238-243.
MLA Wang, Lihua,et al."Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalyst".CATALYSIS LETTERS 118.3-4(2007):238-243.
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