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Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2/La2O3 catalyst

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Isotopic oxygen exchange and EPR studies of superoxide species on the SrF2La2O3 catalyst.htm (400bytes)
Date
2007
Author
Wang, Lihua
Yi, Xiaodong
伊晓东
Weng, Weizheng
翁维正
Zhang, Chunxi
Xu, Xin
徐昕
Wan, Huilin
万惠霖
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  • 化学化工-已发表论文 [14469]
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Abstract
By 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.
Citation
CATALYSIS LETTERS,2007,118(3-4):238-243
URI
http://dx.doi.org/doi: 10.1007/s10562-007-9176-8
https://dspace.xmu.edu.cn/handle/2288/9289

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