Abstract
Natural gas hydrates have drawn much attention as a result of their considerable reserves, clean energy, and global distribution. Some new technologies, such as energy storage and transportation, gas separation, and desalination, have been developed via forming hydrates. The structure, composition, and cage occupancy of gas hydrates and kinetics of hydrate formation and dissociation are crucial in flow assurance and the applications mentioned above. In view of its dependable, efficient, and non-destructive features, in situ Raman spectroscopy is a typical and popular measuring technique in gas hydrates. In this mini review, the application and microscopic characterization using in situ Raman spectroscopy in the gas hydrate field were reviewed, including how to use Raman spectroscopy to identify the structure and molar composition of hydrate and how to offer in situ information on the kinetics of formation, decomposition, replacement, and molecular diffusion at the molecular level. The challenges and perspectives on future studies of in situ Raman spectrometry have been proposed.
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