Radicals in the γ-irradiated hydrates of the three-membered cycles.

Trofimov, V. I.; Blumenfeld, A.L.; Kostyanovsky, Remir G.; Chkheidze, I.I.

doi:10.1016/s0040-4039(01)97152-7

Cited by 3 publications

(2 citation statements)

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“…An electron spin resonance (ESR) investigation of clathrate hydrates was reported by Trofimov et al, who studied radicals in γ-irradiated hydrates of three-membered cycles. 4 Nonetheless, the irradiation effects of clathrate hydrates and thermal stability of radicals induced in hydrate have not been examined sufficiently.…”

Section: Introductionmentioning

confidence: 99%

“…Methane hydrates have been studied by various researchers using Raman spectroscopy and X-ray diffraction for investigation of hydrate stability, dissociation process, and cage occupancy. An electron spin resonance (ESR) investigation of clathrate hydrates was reported by Trofimov et al, who studied radicals in γ-irradiated hydrates of three-membered cycles . Nonetheless, the irradiation effects of clathrate hydrates and thermal stability of radicals induced in hydrate have not been examined sufficiently.…”

Section: Introductionmentioning

confidence: 99%

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Activation Energy of Methyl Radical Decay in Methane Hydrate

et al. 2005

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The thermal stability of gamma-ray-induced methyl radicals in methane hydrate was studied using the ESR method at atmospheric pressure and 210-260 K. The methyl radical decay proceeded with the second-order reaction, and ethane molecules were generated from the dimerization process. The methyl radical decay proceeds by two different temperature-dependent processes, that is, the respective activation energies of these processes are 20.0 +/- 1.6 kJ/mol for the lower temperature region of 210-230 K and 54.8 +/- 5.7 kJ/mol for the higher temperature region of 235-260 K. The former agrees well with the enthalpy change of methane hydrate dissociation into ice and gaseous methane, while the latter agrees well with the enthalpy change into liquid water and gaseous methane. The present findings reveal that methane hydrates dissociate into liquid (supercooled) water and gaseous methane in the temperature range of 235-260 K.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%