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In situ Infrared Spectroscopic Study of CH4 Oxidation Over Co–ZSM-5

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Abstract

Surface species formed in CH4 activation over Co–ZSM-5 were monitored by in situ DRIFT spectroscopy. IR absorption bands assigned to adsorbed methoxide, formate and polyoxymethylene were detected. The similarities in the IR bands and their evolution during He purge after reactions conducted under anaerobic and aerobic conditions suggested that Cannizzaro disproportionation of formaldehyde is a significant reaction pathway. This was verified when water was found to react with a surface species to form adsorbed formate. Continued formation of surface formate was observed during purging in He which indicated substantial surface storage of formaldehyde as polyoxymethylene.

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Acknowledgement

The project is supported by the DOW Chemical Company via the Methane Challenge. We would like to thank Nirajan Rajkarnikar for help with the set up and initial exploration of the use of the DRIFT reaction chamber for this work.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208, USA

    Mayfair C. Kung, Sean S. -Y. Lin & Harold H. Kung

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  1. Mayfair C. Kung
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  2. Sean S. -Y. Lin
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  3. Harold H. Kung
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Correspondence to Mayfair C. Kung.

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Kung, M.C., Lin, S.S.Y. & Kung, H.H. In situ Infrared Spectroscopic Study of CH4 Oxidation Over Co–ZSM-5. Top Catal 55, 108–115 (2012). https://doi.org/10.1007/s11244-012-9774-6

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