Next Article in Journal / Special Issue
Numerical Simulation of Methane Production from Hydrates Induced by Different Depressurizing Approaches
Previous Article in Journal / Special Issue
A Review on Research on Replacement of CH4 in Natural Gas Hydrates by Use of CO2
Article Menu

Article Versions

Export Article

Open AccessArticle
Energies 2012, 5(2), 420-437; doi:10.3390/en5020420

The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH4-CO2 Exchange in the Presence of Impurities

Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany
*
Author to whom correspondence should be addressed.
Received: 15 December 2011 / Revised: 2 February 2012 / Accepted: 14 February 2012 / Published: 22 February 2012
(This article belongs to the Special Issue Natural Gas Hydrate 2011)
View Full-Text   |   Download PDF [2139 KB, uploaded 17 March 2015]   |  

Abstract

The recovery of CH4 gas from natural hydrate formations by injection of industrially emitted CO2 is considered to be a promising solution to simultaneously access an unconventional fossil fuel reserve and counteract atmospheric CO2 increase. CO2 obtained from industrial processes may contain traces of impurities such as SO2 or NOx and natural gas hydrates may contain higher hydrocarbons such as C2H6 and C3H8. These additions have an influence on the properties of the resulting hydrate phase and the conversion process of CH4-rich hydrates to CO2-rich hydrates. Here we show results of a microscopic and laser Raman in situ study investigating the effects of SO2-polluted CO2 and mixed CH4-C2H6 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. View Full-Text
Keywords: gas hydrate; CH4-CO2 exchange; SO2; C2H6; chemical equilibrium; sI-sII conversion gas hydrate; CH4-CO2 exchange; SO2; C2H6; chemical equilibrium; sI-sII conversion
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Beeskow-Strauch, B.; Schicks, J.M. The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH4-CO2 Exchange in the Presence of Impurities. Energies 2012, 5, 420-437.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top