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Raman analysis on methane production from natural gas hydrate by carbon dioxide–methane replacement

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  • Xu, Chun-Gang
  • Cai, Jing
  • Lin, Fu-hua
  • Chen, Zhao-Yang
  • Li, Xiao-Sen

Abstract

Using CO2–CH4 (carbon dioxide–methane) replacement to produce CH4 from NGH (natural gas hydrate) is not only a new CH4 production technology but also a direct way to disposal CO2 by CO2 hydrates. Although there are many studies focusing on the mechanism of CH4 replacement in hydrates by CO2, the mechanism of the replacement is still not clear. In this work, the replacement process and hydrate structure change are tracked and investigated by Raman and NMR (nuclear magnetic resonance) spectra. By comprehensively analyzing the Raman and NMR spectra, we infer the mechanism of the replacement and the hydrate structures. Conclusions are drawn as, on one hand, CH4 molecules are fully replaced with the gas–solid interface, but partly replaced in deeply inner hydrates by CO2 molecules; on the other hand, the CO2 hydrate and CH4 hydrate coexist in a type of structure I (sI) and there is no structure transformation during the replacement. The research results are important to further confirm the mechanism of the replacement and reveal factors restraining efficiency of the CH4 production.

Suggested Citation

  • Xu, Chun-Gang & Cai, Jing & Lin, Fu-hua & Chen, Zhao-Yang & Li, Xiao-Sen, 2015. "Raman analysis on methane production from natural gas hydrate by carbon dioxide–methane replacement," Energy, Elsevier, vol. 79(C), pages 111-116.
    • Handle: RePEc:eee:energy:v:79:y:2015:i:c:p:111-116
    DOI: 10.1016/j.energy.2014.10.068
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    References listed on IDEAS

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    1. Li, Xiao-Sen & Wang, Yi & Duan, Li-Ping & Li, Gang & Zhang, Yu & Huang, Ning-Sheng & Chen, Duo-Fu, 2012. "Experimental investigation into methane hydrate production during three-dimensional thermal huff and puff," Applied Energy, Elsevier, vol. 94(C), pages 48-57.
    2. Li, Xiao-Sen & Yang, Bo & Zhang, Yu & Li, Gang & Duan, Li-Ping & Wang, Yi & Chen, Zhao-Yang & Huang, Ning-Sheng & Wu, Hui-Jie, 2012. "Experimental investigation into gas production from methane hydrate in sediment by depressurization in a novel pilot-scale hydrate simulator," Applied Energy, Elsevier, vol. 93(C), pages 722-732.
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