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Activation of Adsorbed Molecules in Zeolite by Means of Low-temperature Plasma and Photoexcitation

Research Project

Project/Area Number 15550120
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Functional materials chemistry
Research InstitutionOkayama University

Principal Investigator

NAGAO Mahiko  Okayama University, Faculty of Science, Professor, 理学部, 教授 (30032816)

Co-Investigator(Kenkyū-buntansha) KURODA Yasushige  Okayama University, Faculty of Science, Professor, 理学部, 教授 (40116455)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordscopper ion-exchanged zeolite / silver ion-exchanged zeolite / dinitrogen adsorption / nitrogen oxides / plasma treatment / photoexcitation / infrared spectroscopy / methane oxidation / 酸化窒素吸着 / XAFS測定
Research Abstract

Zeolite that is a mixed oxide of silica and alumina has an ability of ion-exchange as well as a porosity, and hence, its internal space can be expected to use as a reaction field. Recently, we have reported that the copper ion-exchanged zeolite (ZSM-5 type) interacts strongly with nitrogen molecules even at room temperature, where the monovalent copper ion species (Cu^+) act as adsorption sites. In the present study, we intended to synthesize nitrogen compounds in the zeolite by means of plasma or photoexcitation and to elucidate the state of sites that reacted with nitrogen molecules as well as the reactivity of nitrogen compound formed. We also tried to prepare new catalysts by making use of the internal space of zeilite as a reaction field.
Some results obtained are as follows. The copper ion-exchanged zeolites (CuZSM-5) prepared have different ability to adsorb nitrogen molecules, depending on the kind of counter ions involved in the exchanging solution ; the sample prepared by using a solution involving carboxylato (-COO^-) was found to be excellent in adsorption property. It was evident that the nitrogen molecules can be activated by plasma excitation to be adsorbed strongly on the zeolite surface (these species are removed by only treating at 573 K in vacuo). Furthermore, silver ion-exchanged zeolite (AgZSM-5) was also prepared, and by photoexciting it with ultraviolet rays, silver clusters consisting of about ten atoms were formed in the zeolite. It became cleat that the coexistence of such silver clusters and silver ions was necessary and sufficient condition for catalytic reaction (partial oxidation of methane).
Two papers including these results have already been published in the scientific journals, and two more papers are submitted to the journals.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (8 results)

All 2004 Other

All Journal Article (6 results) Publications (2 results)

  • [Journal Article] Elucidation of a preparation method for copper ion-exchanged ZSM-5 samples exhibiting extremely efficient N_2-adsorption at room temperature : effect of counter ions in the exchange solution2004

    • Author(s)
      Atsushi Itadani et al.
    • Journal Title

      Microporus and Mesoporous Materials 70

      Pages: 119-126

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Anomalous valence changes and specific dinitrogen adsorption features of copper ion exchanged in ZSM-5 zeolite prepared from an aqueous solution of [Cu(NH_3)_2]^+2004

    • Author(s)
      Yasushige Kuroda et al.
    • Journal Title

      Physical Chemistry Chemical Physics 6

      Pages: 2534-2541

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Elucidation of a preparation method for copper ion-exchanged ZSM-5 samples exhibiting extremely efficient N_2-adsorption at room temperature : effect of counter ions in the exchange solution2004

    • Author(s)
      A.Itadani, Y.Kuroda, M.Nagao
    • Journal Title

      Microporus and Mesoporous Materials 70

      Pages: 119-126

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Anomalous valence changes and specific dinitrogen adsorption features of copper ion exchanged in ZSM-5 zeolite prepared from an aqueous solution of [Cu(NH_3)_2]^+2004

    • Author(s)
      Y.Kuroda, A.Itadani, R.Kumashiro, T.Fuhimoto, M.Nagao
    • Journal Title

      Physical Chemistry Chemical Physics 6

      Pages: 2534-2541

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Elucidation of a Preparation Method for Copper Ion-exchanged ZSM-5 Samples Exhibiting Extremely Efficient N_2-adsorption at Room Temperature : Effect of Counter Ions in the Exchange Solution2004

    • Author(s)
      Atsushi Itadani et al.
    • Journal Title

      Microporous and Mesoporous Materials 70・1-3

      Pages: 119-126

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Anomalous Valence Changes and Specific Dinitrogen Adsorption Features of Copper Ion Exchanged in ZSM-5 Zeolite Prepared from an Aqueous Solution of [Cu(NH_3)_2]^+2004

    • Author(s)
      Yasushige Kuroda et al.
    • Journal Title

      Physical Chemistry Chemical Physics 6・9

      Pages: 2534-2541

    • Related Report
      2004 Annual Research Report
  • [Publications] Atsushi Itadani et al.: "Elucidation of a Preparation Method for Copper Ion-exchanged ZSM-5 Samples Exhibiting Extremely Efficient N_2-adsorption at Room Temperature : Effect of Counter Ions in the Exchange Solution"Microporous and Mesoporous Materials. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yasushige Kuroda et al.: "Anomalous Valence Changes and Specific Dinitrogen Adsorption Features of Copper Ion Exchanged in ZSM-5 Zeolite Prepared from an Aqueous Solution of [Cu(NH_3)_2]^+"Physical Chemistry Chemical Physics. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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