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High-temperature in situ FTIR spectroscopy study of LaOF and BaF2/LaOF catalysts for methane oxidative coupling

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Abstract

In situ FTIR spectroscopy was used to characterize the oxygen adspecies and its reactivity with CH4 over LaOF and 15 mol% BaF2/LaOF catalysts at OCM temperature (750-800°C). It was found that gas-phase oxygen was activated on the surface of LaOF and 15 mol% BaF2/LaOF, which had been pretreated under vacuum at 750 or 800°C, forming O -2 species at high temperature (750-800°C). At 750°C, the adsorbed O -2 species can react with pure CH4 accompanied by formation of gas-phase C2H4 and CO2, and there is a good correlation between the rate of disappearance of surface O2and the rate of formation of gas-phase C2H4. The O -2 species was also observed over the catalysts under working condition, and it reacted with CH4 in a manner that was consistent with its role in a catalytic cycle. These results suggest that O -2 may be the active oxygen species for OCM reaction over these catalysts.

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Authors and Affiliations

  1. Department of Chemistry, Institute of Physical Chemistry and State Key Laboratory for Physical Chemistry of the Solid Surface, Xiamen University, Xiamen, 361005, PR China

    Weizheng Weng, Mingshu Chen, Huilin Wan & Yuanyan Liao

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  1. Weizheng Weng
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  2. Mingshu Chen
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Weng, W., Chen, M., Wan, H. et al. High-temperature in situ FTIR spectroscopy study of LaOF and BaF2/LaOF catalysts for methane oxidative coupling. Catalysis Letters 53, 43–50 (1998). https://doi.org/10.1023/A:1019037301983

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