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2007 Fiscal Year Final Research Report Summary

Development of Hydrogen Isotope Separation Process Using Advanced Catalyst Synthesized with Nano-structure in Supercritical Carbon Dioxide

Research Project

Project/Area Number 16206096
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionNagoya University

Principal Investigator

ENOKIDA Youichi  Nagoya University, EcoTopia Science Institute, Professor (40168795)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Ichiro  Nagoya University, Graduate School of Engineig, Professor (50023320)
SAWADA Kayo  Nagoya University, EcoTopia Science Institute, Associate Professor (90372531)
Project Period (FY) 2004 – 2007
KeywordsSupercritical Carbon Dioxide / Micro Emulsion / Reversed Micelle / Hygrogen Isotope Separation / Nanoparticle / Superhydrophobic / Catalyst / Surfactant
Research Abstract

As a method of enriching low isotopic concentrations of deuterium and tritium, chemical exchange between water and hydrogen molecules is most promising, but platinum catalyst is indispensable to exchange hydrogen atoms between water and hydrogen diatomic molecules. The currently available catalyst is made of platinum nanoparticles on the plastic polymer support, which is easily burnable, and then the safety concern should be paid for using with radioactive hydrogen isotopes. The plastic support has a drawback of causing large pressure drop when it is packed in a isotope exchange column. In This study, in order to solve these technical problems, unburnable stainless steel gauze of very small pressure drop was employed. With a super hydrophobic suite layer, which was funned on the surface of the gauze by chemical vapor deposition of a silicon compound Since the superhydrophobic layer has a nano structure of uneven and rough surface, we introduced chemical reagent of platinum precursor by … More using reversed micelle formed with a surfactant in super critical carbon dioxide, which shows a large molecular diffusivity in to a tiny pores. In this study, in the first place, we found a commercially available surfactant of low cost works successfully for this purpose, and platinum precursor was introduced in the hydrophobic structure, then funned platinum nanoparticles as planned. Additionally we found an another new method of introducing platinum precursor in nanopores on the hydrophobic surface structure : the method is based on the capillary condensation of a solute, which was in this case, a platinum precursor in supercritical carbon dioxide, platinum nanoparticles of which diameter was 2 nm were formed and deposited in the superhydrophobic layer, which was confirmed by a transmittance microscope imaging Concerning with performance of the newly prowled catalyst, we performed an isotopic exchange experiment using deuterium gas and deutriated water, and then qualitative data were obtained showing the newly prepared catalyst works as a catalyst packed in a column for hydrogen isotope separation by the chemical exchange reaction between water and hydrogen gas. The scientific and technical results gained in this study were described in a paper published in an academic periodical journal and four papers in the proceedings of the international conferences. A patent application was submitted for u utilization of capillary condensation of a solute in supercritical carbon dioxide. Less

  • Research Products

    (9 results)

All 2008 2007 2005 2004

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results)

  • [Journal Article] Preparation of hydrophobic platinum catalysts using a water-in-CO2 microemulsion2008

    • Author(s)
      R. Shimizu, A. Nibe, K. Sawada, Y. Enokida, I. Yamamoto
    • Journal Title

      JOURNAL OF SUPERCRITICAL FLUIDS 44

      Pages: 109-114

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Presentation] Hydrogen Isotope Separation by Water-hydrogen Chemical Exchange Using a Trickle Bed Column2007

    • Author(s)
      A. Ushida, T. Sugiyama, Y. Enokida, I. Yamamoto
    • Organizer
      3rd International Symposium on Isotope Science and Engineering from Basics to Applications
    • Place of Presentation
      名古屋大学
    • Year and Date
      2007-09-19
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Hydrogen Isotope Separation by Water-hydrogen Chemical Exchange. Using a Trickle Bed Column2007

    • Author(s)
      A. Ushida, T. Sugiyama, Y. Enokida, I. Yamamoto
    • Organizer
      3rd International Symposium on Isotope Science and Engineering from Basics to Applications
    • Place of Presentation
      Nagoya University, Nagoya, Japan
    • Year and Date
      2007-09-19
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Decontamination of Tritiated-Water Using Superhydrophobic Pt-CatalystSynthesized with Water-in-Supercritical CO_22007

    • Author(s)
      Y. Enokida, R. Shimizu, K. Sawada, I. Yamamoto
    • Organizer
      American Nuclear Society Topical Meeting: Decommissioning, Decontamination amd Reutilization 2007 and Technological Expo
    • Place of Presentation
      米国テネシー州チャタヌーガ市チャタヌーガンホテル
    • Year and Date
      2007-09-18
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Decontamination of Tritiated-Water Using Superhydrophobic Pt-CatalystSynthesized with Water-in-Supercritical CO22007

    • Author(s)
      Y. Enokida, R. Shimizu, K. Sawada, I. Yamamoto
    • Organizer
      American Nuclear Society Topical Meeting : Decommissioning, Decontamination and Reutilization 2007 and Technological Expo
    • Place of Presentation
      Chatanoogan Hotel, Chatanooga, Tennessee, USA
    • Year and Date
      2007-09-18
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Platinum Catalyst Synthesis on Superhydrophobic Surface for Hydrogen Isotope Separation Using Water-in-Supercritical Carbon Dioxide Microemulsion2005

    • Author(s)
      Y. Enokida, R. Shimizu, A. Nibe, K. Sawada, I. Yamamoto
    • Organizer
      The 4th International Symposium on Supercritical Fluid Technology for Energy and Environment Applications
    • Place of Presentation
      中華民国国立台湾大学
    • Year and Date
      2005-11-23
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Platinum Catalyst Synthesis on Superhydrophobic Surface for Hydrogen Isotope Separation Using Water-in-Supercritical Carbon Dioxide Microemulsion2005

    • Author(s)
      Y. Enokida, R. Shimizu, A. Nibe, K. Sawada, I. Yamamoto
    • Organizer
      The 4th International Symposium on Supercritical Fluid Technology for Energy and Environment Applications
    • Place of Presentation
      Nayional Taiwan University, Taiwan
    • Year and Date
      2005-11-23
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Application of Supercritical Carbon Dioxide in Nuclear Chemical Engineering2004

    • Author(s)
      Y. Enokida, K. Sawada, I. Yamamoto
    • Organizer
      The 3rd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications
    • Place of Presentation
      中国天津大学
    • Year and Date
      2004-10-26
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Application of Supercritical Carbon Dioxide in Nuclear Chemical Engineering2004

    • Author(s)
      Y. Enokida, K. Sawada, I. Yamamoto
    • Organizer
      The 3rd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications
    • Place of Presentation
      Tenjing University, China
    • Year and Date
      2004-10-26
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2010-02-04  

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