| 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 ??1 symmetric bands, resulting in hydration numbers of 6.04 ?? 0.03. The frequency of the ??1 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. |
| Genre: | Article |
| ProdID: | 70019711 |
| Citation Author: | Sum, A. K.; Burruss, R. C.; Sloan, Jr. , E. D. |
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| Citation End Page: | 7377 |
| Citation Issue: | 38 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Physical Chemistry B |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Measurement of clathrate hydrates via Raman spectroscopy; 1997; Article; Journal; Journal of Physical Chemistry B; Sum, A. K.; Burruss, R. C.; Sloan, Jr. , E. D. |
| Citation Start Page: | 7371 |
| Citation Volume: | 101 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Measurement of clathrate hydrates via Raman spectroscopy; 1997; Article; Journal; Journal of Physical Chemistry B; Sum, A. K.; Burruss, R. C.; Sloan, Jr. , E. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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