Raman spectroscopy of a hydrated CO2/water composite

Monsuru O. Gborigi, David A. Riestenberg, Michael J. Lance, Scott D. McCallum, Yousef Atallah, Costas Tsouris

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Formation of a sinking carbon dioxide (CO2) hydrate composite has been investigated as an alternative to direct liquid CO2 injection and pure CO2 hydrate formation for ocean carbon sequestration. Raman spectroscopy of the CO2 hydrate composite was also performed to determine the presence of various components in the composite produced by the co-injection of liquid CO2 and water. This work is focused on the formation and spectroscopy of a semi-solid sinking CO2 hydrate composite formed using a co-flow injector in 72-liter and 0.45-liter pressurized vessels at pressure and temperature conditions equivalent to approximately 1.3-km depth in the ocean. The Raman wavenumber shifts (Δcm- 1) corresponding to CO2 and water molecules as well as shifts in Raman peak positions due to different CO2 phases were obtained. The Raman spectra of the composite showed that both liquid and hydrate phases of CO2 are present. The dissolution rate of CO2 hydrate composite in water was also studied. An attempt was made to calculate the hydration number for the CO2 hydrate composite and also the percentage of liquid CO2 and water loss during formation.

Original languageEnglish
Pages (from-to)65-74
Number of pages10
JournalJournal of Petroleum Science and Engineering
Volume56
Issue number1-3
DOIs
StatePublished - Mar 2007

Funding

Gratefully acknowledged is the support from the Ocean Carbon Sequestration Program, Office of Biological and Environmental Research, U.S. Department of Energy (DOE), under contract # DE-AC05-00OR22725 with UT-Battelle, LLC. Also, acknowledged is the support by the Biological and Environmental Research Program for Minority Institutions administered by the Oak Ridge Institute for Science and Education.

Keywords

  • Carbon dioxide sequestration
  • Clathrates
  • Gas hydrates
  • Raman spectroscopy

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