Clathrate hydrates for ozone preservation

Sanehiro Muromachi, Ryo Ohmura, Satoshi Takeya, Yasuhiko H. Mori

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We report the experimental evidence for the preservation of ozone (O 3) encaged in a clathrate hydrate. Although ozone is an unstable substance and is apt to decay to oxygen (O2), it may be preserved for a prolonged time if it is encaged in hydrate cavities in the form of isolated molecules. This possibility was assessed using a hydrate formed from an ozone + oxygen gas mixture coexisting with carbon tetrachloride or xenon. Each hydrate sample was stored in an air-filled container at atmospheric pressure and a constant temperature in the range between -20 and 2 °C and was continually subjected to iodometric measurements of its fractional ozone content. Such chronological measurements and structure analysis using powder X-ray diffraction have revealed that ozone can be preserved in a hydrate-lattice structure for more than 20 days at a concentration on the order of 0.1% (hydrate-mass basis).

Original languageEnglish
Pages (from-to)11430-11435
Number of pages6
JournalJournal of Physical Chemistry B
Issue number35
Publication statusPublished - 2010 Sept 9

ASJC Scopus subject areas

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


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