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Direct decomposition of nitrous oxide using open space and oxygen in the lattice

Research Project

Project/Area Number 19K15290
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionOsaka University

Principal Investigator

Nunotani Naoyoshi  大阪大学, 工学研究科, 助教 (40715314)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords環境触媒 / 亜酸化窒素 / 直接分解 / 希土類 / 希土類酸化物 / C型構造
Outline of Research at the Start

亜酸化窒素は、二酸化炭素の約300倍の温室効果を示すことに加え、フロン同様にオゾン層を破壊する原因物質でもある。亜酸化窒素を分解する触媒の報告例はあるが、高価かつ希少な貴金属を用いている、もしくは高温や他ガスの耐久性に問題があった。本研究では、高効率で亜酸化窒素を窒素と酸素に分解でき、かつ耐久性に優れる貴金属フリー触媒を創成することを目指す。これを実現するため、格子内に大きな隙間を有する立方晶C型希土類三二酸化物に着目する。さらに、触媒に酸素貯蔵放出能を付与することで、亜酸化窒素分解に触媒自身の格子内酸素を関与させ、亜酸化窒素の分解を促進させる。

Outline of Final Research Achievements

In order to effectively remove nitrous oxide (N2O) which causes the global warming and the ozone layer depletion, I developed the novel catalysts for the direct N2O decomposition. I focused on Yb2O3 with the cubic C-type rare earth sesquioxide structure, which has the large open spaces in the lattice. In addition, Co2+/3+ or Cu+/2+ was introduced into the lattice to accelerate the decomposition reaction by supplying the lattice oxygen. As results, (Yb0.85Cu0.15)2O3-δshowed the highest activity, and decomposed N2O at the temperature as low as 400℃. Furthermore, I also demonstrated that the open space in the C-type structure worked as the N2O adsorption sites and the catalytic active sites.

Academic Significance and Societal Importance of the Research Achievements

本研究では、温室効果に加え、オゾン層破壊効果もある亜酸化窒素を分解するため、触媒の格子内間隙および格子内酸素に着目し、これらを活用した新規な貴金属フリー触媒の創成を行った。その結果、亜酸化窒素を効率的に無害な窒素と酸素まで直接分解でき、かつ他ガス(酸素や水蒸気)共存化においても高い活性を維持できることを明らかにした。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Direct N2O decomposition over Yb2O3-CuO catalysts with C-type cubic structure2020

    • Author(s)
      Cho Chang-Min、Nunotani Naoyoshi、Imanaka Nobuhito
    • Journal Title

      Functional Materials Letters

      Volume: 13 Issue: 08 Pages: 2050040-2050040

    • DOI

      10.1142/s179360472050040x

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct Decomposition of N2O over C-Type Cubic Yb2O3-Co3O4 Catalysts2019

    • Author(s)
      Chang-Min Cho, Naoyoshi Nunotani, and Nobuhito Imanaka
    • Journal Title

      Bulletin of the Chemical Society of Japan

      Volume: 92 Issue: 7 Pages: 1148-1153

    • DOI

      10.1246/bcsj.20190058

    • NAID

      130007679373

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of Oxygen Vacancies on Direct N2O Decomposition over ZrO2-Y2O3 Catalysts2019

    • Author(s)
      Chang-Min Cho, Naoyoshi Nunotani, and Nobuhito Imanaka
    • Journal Title

      Journal of Asian Ceramic Societies

      Volume: 7 Issue: 4 Pages: 518-523

    • DOI

      10.1080/21870764.2019.1675941

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Direct N2O Decomposition over CeO2-Sm2O3-CuO Catalysts with Fluorite-type Structure2021

    • Author(s)
      ○L. Yang, N. Nunotani, N. Imanaka
    • Organizer
      日本セラミックス協会2021年年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ZrO2-Y2O3触媒の酸化物イオン欠陥がN2O直接分解活性に与える影響2020

    • Author(s)
      ○布谷直義、Cho Chang-Min、今中信人
    • Organizer
      第126回触媒討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ZrO2-Y2O3触媒におけるN2O直接分解活性に対する酸化物イオン欠陥の影響2020

    • Author(s)
      ○布谷直義、Cho Chang-Min、今中信人
    • Organizer
      第125回触媒討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] 立方晶C型Yb2O3-Co3O4触媒によるN2Oの直接分解2019

    • Author(s)
      ○Cho Chang-Min、布谷直義、今中信人
    • Organizer
      第35回希土類討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] 立方晶C型Yb2O3-CuO複合酸化物による亜酸化窒素の直接分解2019

    • Author(s)
      ○Cho Chang-Min、布谷直義、今中信人
    • Organizer
      第124回触媒討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] Direct Decomposition of Nitrous Oxide to Nitrogen and Oxygen Using C-type Ytterbium Oxide-Cobalt Oxide Catalysts2019

    • Author(s)
      ○N. Nunotani, C.M. Cho, N. Imanaka
    • Organizer
      10th International Conference on High Temperature Ceramics Matrix Composites (HT-CMC10)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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