A precise deconvolution method to derive methane hydrate cage occupancy ratios using Raman spectroscopy

Yuya Hiraga, Takuya Sasagawa, Shinichiro Yamamoto, Hiroyuki Komatsu, Masaki Ota, Takao Tsukada, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Raman spectroscopy was used to analyze cage occupancy of thin homogeneous methane hydrate (MH) films at (2.9 to 7.6) MPa and (273 to 276) K. The MH films were synthesized on the lower surface of a sapphire window of a high-pressure cell to eliminate noise associated with the C[sbnd]H stretching vibration of bulk methane gas. Methane medium-size to small-size cage occupancy ratios of the MH films were determined for purposes of assessing the reliability of deconvolution functions used in data reduction. Gaussian, Lorentzian and Voigt functions were considered and the Voigt function was found to provide the most reliable function in terms of fitting precision. Methane occupancy ratios tend to decrease with increasing pressure which is important for practical scale simulations.

Original languageEnglish
Article number115361
JournalChemical Engineering Science
Volume214
DOIs
Publication statusPublished - 2020 Mar 16

Keywords

  • Clathrate hydrate
  • Energy
  • Experimental technique
  • Raman spectra deconvolution

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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