Abstract
Decomposition curves of double ionic clathrate hydrates of tetrabutylammonium fluoride with helium, neon, hydrogen and argon were studied at pressures up to 800 MPa. Formation of double hydrates with helium, neon and hydrogen does not lead to any significant increase of the temperatures of decomposition of these hydrates; at high temperatures the hydrates may decompose even at lower temperatures than the hydrate of pure tetraalkylammonium salt does. Decomposition temperatures of double hydrates with argon in all cases were 4–8 °C higher in comparison with the decomposition temperature of ionic clathrate hydrates of tetrabutylammonium fluoride. We suppose that this behavior is caused by simultaneous effect of three factors on hydrate decomposition temperature: (1) partial filling of the small cavities in the framework of the hydrate with water molecules, (2) weakness of the van der Waals interactions between the gas molecules and the host water molecules, and (3) dissolution of helium, hydrogen and neon in the solution of tetrabutylammonium salt causing a decrease of melting temperatures of the hydrates formed from these solutions.
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This work was supported by RFBR grant 09-03-00367.
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Aladko, E.Y., Larionov, E.G., Rodionova, T.V. et al. Double clathrate hydrates of tetrabutylammonium fluoride + helium, neon, hydrogen and argon at high pressures. J Incl Phenom Macrocycl Chem 68, 381–386 (2010). https://doi.org/10.1007/s10847-010-9797-1
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DOI: https://doi.org/10.1007/s10847-010-9797-1