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The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH 4 -CO 2 Exchange in the Presence of Impurities

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  • Bettina Beeskow-Strauch

    (Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany)

  • Judith Maria Schicks

    (Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany)

Abstract

The recovery of CH 4 gas from natural hydrate formations by injection of industrially emitted CO 2 is considered to be a promising solution to simultaneously access an unconventional fossil fuel reserve and counteract atmospheric CO 2 increase. CO 2 obtained from industrial processes may contain traces of impurities such as SO 2 or NO x and natural gas hydrates may contain higher hydrocarbons such as C 2 H 6 and C 3 H 8 . These additions have an influence on the properties of the resulting hydrate phase and the conversion process of CH 4 -rich hydrates to CO 2 -rich hydrates. Here we show results of a microscopic and laser Raman in situ study investigating the effects of SO 2 -polluted CO 2 and mixed CH 4 -C 2 H 6 hydrate on the exchange process. Our study shows that the key driving force of the exchange processes is the establishment of the chemical equilibrium between hydrate phase and the surrounding phases. The exchange rate is also influenced by the guest-to-cavity ratio as well as the thermodynamic stability in terms of p - T conditions of the original and resulting hydrate phase. The most effective molecule exchange is related to structural changes (sI-sII) which indicates that hydrate decomposition and reformation processes are the occurring processes.

Suggested Citation

  • Bettina Beeskow-Strauch & Judith Maria Schicks, 2012. "The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH 4 -CO 2 Exchange in the Presence of Impurities," Energies, MDPI, vol. 5(2), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:2:p:420-437:d:16265
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    References listed on IDEAS

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    1. Aydin, Gokhan & Karakurt, Izzet & Aydiner, Kerim, 2010. "Evaluation of geologic storage options of CO2: Applicability, cost, storage capacity and safety," Energy Policy, Elsevier, vol. 38(9), pages 5072-5080, September.
    2. Hailong Lu & Yu-taek Seo & Jong-won Lee & Igor Moudrakovski & John A. Ripmeester & N. Ross Chapman & Richard B. Coffin & Graeme Gardner & John Pohlman, 2007. "Complex gas hydrate from the Cascadia margin," Nature, Nature, vol. 445(7125), pages 303-306, January.
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    Cited by:

    1. Gajanan, K. & Ranjith, P.G. & Yang, S.Q. & Xu, T., 2024. "Advances in research and developments on natural gas hydrate extraction with gas exchange," Renewable and Sustainable Energy Reviews, Elsevier, vol. 190(PB).
    2. Ouyang, Qian & Pandey, Jyoti Shanker & von Solms, Nicolas, 2022. "Insights into multistep depressurization of CH4/CO2 mixed hydrates in unconsolidated sediments," Energy, Elsevier, vol. 260(C).
    3. Lee, Yohan & Kim, Yunju & Lee, Jaehyoung & Lee, Huen & Seo, Yongwon, 2015. "CH4 recovery and CO2 sequestration using flue gas in natural gas hydrates as revealed by a micro-differential scanning calorimeter," Applied Energy, Elsevier, vol. 150(C), pages 120-127.

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