Measurement of clathrate hydrates via Raman spectroscopy
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Abstract
Raman spectra of clathrate hydrate guest molecules are presented for three known structures (I (sI), II (sII), and H (sH)) in the following systems: CH4 (sI), CO2 (sI), C3H8 (sII), CH4 + CO2 (sI), CD4 + C3H8 (sII), CH4 + N2 (sI), CH4 + THF-d8 (sII), and CH4 + C7D14 (sH). Relative occupancy of CH4 in the large and small cavities of sI were determined by deconvoluting the ν1 symmetric bands, resulting in hydration numbers of 6.04 ± 0.03. The frequency of the ν1 bands for CH4 in structures I, II, and H differ statistically, so that Raman spectroscopy is a potential tool to identify hydrate crystal structure. Hydrate guest compositions were also measured for two vapor compositions of the CH4 + CO2 system, and they compared favorably with predictions. The large cavities were measured to be almost fully occupied by CH4 and CO2, whereas only a small fraction of the small cavities are occupied by CH4. No CO2 was found in the small cavities. Hydration numbers from 7.27 to 7.45 were calculated for the mixed hydrate.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Measurement of clathrate hydrates via Raman spectroscopy |
| Series title | Journal of Physical Chemistry B |
| DOI | 10.1021/jp970768e |
| Volume | 101 |
| Issue | 38 |
| Year Published | 1997 |
| Language | English |
| Publisher | ACS Publications |
| Description | 7 p. |
| First page | 7371 |
| Last page | 7377 |
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