• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Salt effect on ionic reactions in supercritical water

Research Project

Project/Area Number 13650823
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 反応・分離工学
Research InstitutionHokkaido University

Principal Investigator

TAKAHASHI Kenji  Hokkaido Univ., Grad. School of Eng., Inst., 大学院・工学研究科, 助手 (00216714)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsReaction rate / Hydrated electron / Hydroxyl radical / Solvation / Electron transfer / ヒドロキシルラジカル / イオン対 / 誘電率 / クーロンポテンシャル / 放射線分解 / 水和 / アレニウス / 水素イオン
Research Abstract

Temperature ahd pressure effects on reactions of hydrated elelctrons and OH radical have been studied near the critical temperature of water. The reaction rates were measured using pulse radiolysis technique. The time resolution is about 5 nano-seconds. Reaction between hydrated electron and nitrobenzene is close to a diffusion limit. The reaction rate, however, sharply slow down near the critical temperature. Reaction rates between hydrated electron and N_2O can be explained by the Marcus electron transfer model.
Reaction rates of OH radical with H_2 in high temperature water are 10 times faster than those in gas phase. Near 350 C, however, the reaction rates in water slow down and approach to the reaction rate in gas phase. These differences in the reaction rates can be explained by considering hydration of reactants including transition state. A similar reaction model predicts that reaction of OH with benzene in water could be faster than that in gas phase even near 350 C. Therefore the reaction rates of OH with benzene in gas phase cannnot be applicable in high temperature water.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Kenji Takahashi: "Reaction rates of the hydrated electron with NO2-, NO3-, and hydronium ions as a function of temperature from 125 to 380℃"Chem. Phys. Lett.. 357. 358-364 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Jason A.Cline: "Pulse radiolysis of supercritical water I. Reactions between hydrophobic and anionic species"J. Phys. Chem. A.. 106. 12260-12269 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Timothy W.Marin: "Pulse radiolysis of supercritical water II. Reaction of nitrobenzene with hydrated electrons and hydroxyl radicals"J. Phys. Chem. A.. 106. 12270-12279 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 荒井康彦: "超臨界流体のすべて"テクノシステム. 656 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kenji Takahashi: "Reaction rates of the hydrated electron with NO_2, NO_3, and hydronium ions as a function of temperature from 125 to 380 C"Chem. Phys. Lett.. 357. 358-364 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Jason A. Cline: "Pulse radiolysis of supercritical water I. Reactions between hydrophobic and anionic species"J. Phys. Chem. A. 106. 12260-12269 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Timothy W. Marin: "Pulse radiolysis of supercritical water II. Reaction of nitrobenzene with hydrated electrons and hydroxyI radicals"J. Phys. Chem. A. 12270-12279 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kenji Takahashi: "Reaction rates of the hydrated electron with NO_2, NO_3, and hydronium ions as a function of temperature from 125 to 380 C"Chem.Phys.Lett.. 357. 358-364 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Jason A.Cline: "Pulse radiolysis of supercritical water I. Reactions between hydrophobic and anionic species."J. Phys. Chem. A.. 106. 12260-12269 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Timothy W. Marin: "Pulse radiolysis of supercritical water II. Reaction of nitrobenzene with hydrated electron and hydroxyl radicals."J. Phys. Chem. A.. 106. 12270-12279 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 荒井康彦: "超臨界流体のすべて"テクノシステム. 656 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 荒井康彦: "超臨界流体のすべて"テクノシステム. 800 (2002)

    • Related Report
      2001 Annual Research Report

URL: 

Published: 2001-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi