Journal
VIBRATIONAL SPECTROSCOPY
Volume 50, Issue 2, Pages 319-323Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vibspec.2009.02.003
Keywords
Mixed hydrates; Tetrahydrofuran; Methane; Structural transformations; Laser micro-Raman spectroscopy
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Funding
- Ministry of Earth Science Systems
- Ministry of petroleum, oil and natural gas, Government of India
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We report laser Raman spectroscopic measurements on mixed hydrates (clathrates), with guest molecules tetrahydrofuran (THF) and methane (CH4), at ambient pressure and at temperatures from 175 to 280 K. Gas hydrates were synthesized with different concentrations of THF ranging from 5.88 to 1.46 mol%. In all cases THF molecules occupied the large cages of A hydrate. The present studies demonstrate formation of A clathrates with CH4 molecules occupying unfilled cages for concentrations of THF ranging from 5.88 to 2.95 mol%. The Raman spectral signature of hydrates with 1.46 mol% THF are distinctly different; hydrate growth was non-uniform and structural transformation occurred from A to sl prior to clathrate melting. (c) 2009 Elsevier B.V. All rights reserved.
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