Dissociation kinetics of propane–methane and butane–methane hydrates below the melting point of ice
文献情報
Satoshi Takeya, Akihiro Hachikubo
Understanding the dissociation mechanism of gas hydrates below the melting point of ice is crucial for expanding the practical applications of solid hydrates in gas storage. The kinetic processes for gas hydrates have not been clarified, except for those of pure CH4 hydrate and CO2 hydrates. In this study, using in situ X-ray diffraction analysis, the low-temperature onset of the dissociation of C3H8 and C4H10 hydrate fine particles encapsulating CH4 as a secondary guest was investigated during temperature ramping. At ∼200 K, the C3H8 + CH4 hydrate, n-C4H10 + CH4 hydrate, and iso-C4H10 + CH4 hydrate all dissociated in a single step, similar to pure C3H8 and pure iso-C4H10 hydrate. The dissociation of C3H8 hydrate was also found to accelerate the dissociation of CH4 hydrate. Based on the experimental results, it was confirmed that the C3H8 and C4H10 molecules released from the dissociating hydrates accelerated hydrate dissociation.
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