TY - JOUR
T1 - A precise deconvolution method to derive methane hydrate cage occupancy ratios using Raman spectroscopy
AU - Hiraga, Yuya
AU - Sasagawa, Takuya
AU - Yamamoto, Shinichiro
AU - Komatsu, Hiroyuki
AU - Ota, Masaki
AU - Tsukada, Takao
AU - Smith, Richard L.
PY - 2020/3/16
Y1 - 2020/3/16
N2 - 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.
AB - 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.
KW - Clathrate hydrate
KW - Energy
KW - Experimental technique
KW - Raman spectra deconvolution
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U2 - 10.1016/j.ces.2019.115361
DO - 10.1016/j.ces.2019.115361
M3 - Article
AN - SCOPUS:85079179620
VL - 214
JO - Chemical Engineering Science
JF - Chemical Engineering Science
SN - 0009-2509
M1 - 115361
ER -