In situ Raman spectroscopy investigation of the dissociation of methane hydrate at temperatures just below the ice point

Takeshi Komai, Seong Pil Kang, Ji Ho Yoon, Yoshitaka Yamamoto, Taro Kawamura, Michika Ohtake

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Dissociation kinetics of methane hydrates was investigated by using in situ Raman spectroscopy at temperatures just below the melting point of ice. Measurements of decomposition rates were performed using finely powdered hydrate samples with a diameter range of 100-250 μm. It was found that the dissociation rate of methane hydrate at 0.1 MPa is considerably faster than that at 0.25 and 0.5 MPa. A kinetic model using non steady-state approximation and a diffusion-controlled regime is presented for describing the decomposition behavior of methane hydrates. This approach would be effective for modeling the dissociation of methane hydrate in the early stages of dissociation. The diffusion coefficients of methane molecules through the hydrate surface coated with ice are estimated to be 1.7 × 10-13, 6.7 × 10 -14, and 2.9 × 10-14 m2/s at 272.65, 271.15, and 268.15 K, respectively.

Original languageEnglish
Pages (from-to)8062-8068
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number23
DOIs
Publication statusPublished - 2004 Jun 10
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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