Decomposition kinetics and recycle of binary hydrogen-tetrahydrofuran clathrate hydrate

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Abstract

Decomposition kinetics and recycle of hydrogen-tetrahydrofuran (H2-THF) clathrate hydrates were investigated with a pressure decay method at temperatures from 265.1 to 273.2 K, at initial pressures from 3.1 to 8.0 MPa, and at stoichiometric THF hydrate concentrations for particle sizes between 250 and 1000 μm. The decomposition was modeled as a two-step process consisting of H2 diffusion in the hydrate phase and desorption from the hydrate cage. The adsorption process occurred at roughly two to three times faster than the desorption process, whereas the diffusion process during formation was slightly higher (ca. 20%) than that during decomposition. Successive formation and decomposition cycles showed that occupancy seemed to decrease only slightly with cycling and that there were no large changes in hydrate structure due to cycling. Results provide evidence that the formation and decomposition of H2 clathrate hydrates occur reversibly and that H2 clathrate hydrates can be recycled with pressure. © 2010 American Institute of Chemical Engineers AIChE J, 2011

Original languageEnglish
Pages (from-to)265-272
Number of pages8
JournalAIChE Journal
Volume57
Issue number1
DOIs
Publication statusPublished - 2011 Jan

Keywords

  • Clathrate hydrate
  • Formation kinetics
  • Hydrogen hydrate phase diffusion model
  • Hydrogen storage

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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