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Skeletal isomerization of n-butane under supercritical conditions

Research Project

Project/Area Number 17560682
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Catalyst/Resource chemical process
Research InstitutionSophia University

Principal Investigator

SEGAWA Kohichi  Sophia University, Department of Chemistry, Professor, 理工学部, 教授 (60053675)

Co-Investigator(Kenkyū-buntansha) FUNAMOTO Takako  Sophia University, Department of Chemistry, Research Associate, 理工学部, 助手 (90384172)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsGreen engineering / Chemical catalyst process / Functional structural materials / Supercritical fluid
Research Abstract

Light isoalkanes have high octane numbers and are widely used as the blendstock for the green gasoline. Sulfated zirconia is a strong solid acid catalyst and is efficient for isomerization of n-alkane. To promote its catalytic activity, I prepared sulfated zirconia-alumina by addition of aluminum, which is a highly electronegative atom, to its surface with a co-precipitation technique. I also investigated the effect of Al on its activity and acidity, and tested the isomerization reaction of the alkanes under supercritical conditions of reactant molecules. However, most of the solid catalysts including sulfated zirconia have a problem of rapid deactivation due to the coke formation. In this research, I applied super critical conditions of reactant molecules because the conditions result in lower viscosity and higher diffusibility. Addition of Al into sulfated zirconia suppressed the crystallization and the phase transition to monoclinic. Al addition to zirconia structure caused the structural strain leading to retarding the phase transitions and improving the thermal stability. IR and XPS results suggested that the enhancement of positive charges on Zr atoms strengthens those acidic sites because of the high electron negativity of Al. Under the supercritical condition, the deactivation was well suppressed, and the higher activity was maintained. Especially for below 5 mol% alumina-added, sulfated zirconia showed the higher catalytic activity for isomerization of n-alkane.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report

Research Products

(5 results)

All 2005 Other

All Journal Article

  • [Journal Article] Isomerization of n-butane over sulfated zirconia catalyst under supercritical conditions2005

    • Author(s)
      舩本 貴子
    • Journal Title

      Applied Catalysis A : General 286

      Pages: 79-84

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Isomerization of n-butane over sulfated zirconia catalyst under supercritical conditions2005

    • Author(s)
      Takako FUNAMOTO
    • Journal Title

      Applied Catalysis A Genera1286

      Pages: 79-84

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Isomerization of n-alkanes under supercritical conditions over Al-promoted sulfated zirconia

    • Author(s)
      舩本 貴子
    • Journal Title

      Studies in Surface Science and Catalysis (impress)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Isomerization of n-alkanes under supercritical conditions over Al-promoted sulfated zirconia

    • Author(s)
      Takako FUNAMOTO
    • Journal Title

      Studies in Surface Science and Catalysis (impress)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Isomerization of n-alkanes under supercritical conditions over Al-promoted sulfated zirconia

    • Author(s)
      舩本 貴子
    • Journal Title

      Studies in Surface Science and Catalysis (impress)

    • Related Report
      2006 Annual Research Report

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Published: 2005-03-31   Modified: 2016-04-21  

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