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dc.contributor.authorWang, Lihua
dc.contributor.authorYi, Xiaodong
dc.contributor.author伊晓东
dc.contributor.authorWeng, Weizheng
dc.contributor.author翁维正
dc.contributor.authorZhang, Chunxi
dc.contributor.authorXu, Xin
dc.contributor.author徐昕
dc.contributor.authorWan, Huilin
dc.contributor.author万惠霖
dc.date.accessioned2011-05-30T15:23:24Z
dc.date.available2011-05-30T15:23:24Z
dc.date.issued2007
dc.identifier.citationCATALYSIS LETTERS,2007,118(3-4):238-243zh_CN
dc.identifier.issn1011-372X
dc.identifier.urihttp://dx.doi.org/doi: 10.1007/s10562-007-9176-8
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/9289
dc.description.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.zh_CN
dc.language.isoenzh_CN
dc.publisherSPRINGERzh_CN
dc.subjectisotopic oxygen exchangezh_CN
dc.subjectin situ IRzh_CN
dc.subjectEPRzh_CN
dc.subjectsuperoxide specieszh_CN
dc.subjectmethane oxidative couplingzh_CN
dc.titleIsotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalystzh_CN
dc.typeArticlezh_CN


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