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The oxidative coupling of methane and the activation of molecular O2 on CeO2/BaF2

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Abstract

CeO2/BaF2 was used as the catalyst for the oxidative coupling of methane (OCM). At 800°C and CH4∶O2=2.7∶1,CH4 conversion of 34% with C2 hydrocarbon selectivity of 54.3% was obtained. XRD measurement showed that partial anion (O2−,F−) and/or cation (Ce4+,Ba2+) exchange between CeO2 and BaF2 lattices occurred. ESR study showed that O− species existed on degassed catalyst. XPS study revealed that, when BaF2 was added to CeO2, the binding energy of Be 3d5/2 was 2.2 eV lower than that in CeO2, and the “electron-enriched lattice oxygen” species was detected. XPS, ESR and Raman study showed that, under O2 adsorbing conditions, O 2−2 and O 2− species were detected on CeO2/BaF2.

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Authors and Affiliations

  1. Department of Chemistry, Xiamen University, 361005, Xiamen, PR China

    X. P. Zhou, Z. S. Chao, W. Z. Weng, W. D. Zhang, S. J. Wang, H. L. Wan & K. R. Tsai

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  1. X. P. Zhou
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  2. Z. S. Chao
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  3. W. Z. Weng
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  4. W. D. Zhang
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  5. S. J. Wang
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  6. H. L. Wan
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  7. K. R. Tsai
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Additional information

This work was supported by the State Key Laboratory for Physical Chemistry of the solid surface and the National Science Foundation of China.

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Zhou, X.P., Chao, Z.S., Weng, W.Z. et al. The oxidative coupling of methane and the activation of molecular O2 on CeO2/BaF2 . Catal Lett 29, 177–188 (1994). https://doi.org/10.1007/BF00814264

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  • DOI: https://doi.org/10.1007/BF00814264

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