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Static and Dynamic Effects of Ferroelectric Piezoelectrics upon Adsorptive Catalytic Properties of Combined Thin Metal and Semiconducting Oxide Films.

Research Project

Project/Area Number 61470003
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理化学一般
Research InstitutionTechnological University of Nagaoka

Principal Investigator

INOUE Yasunobu  Associate Professor of Technological University of Nagaoka, 分析計測センター, 助教授 (30016133)

Co-Investigator(Kenkyū-buntansha) SATO Kazunori  Assistant of Technological University of Nagacoka, 工学部, 助手 (20143828)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1987: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1986: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsAdsorption and Catalysis / Lithium niobate / 分極場効果 / ニオブ酸リチウム / 触媒作用 / 弾性表面法 / 強誘電体 / 気体吸着
Research Abstract

A poled ferroelectric piezoelectrics exposes the positive and negative polar suraces and permits the generation of surface acoustic wave(SAW). In the present work, a poled single crystal of lithium niobate(LinbO_3) was employed as support on which catalytically active phases such as semiconducting oxides(TiO_2,SnO) or metal(Pd) were deposited as thin layers. The static effects of polarization-direction of the support as well as the dynamic effects due to SAW(20 MHz) upon the adsorptive and catalytic properties of the combined catalytically active phases were studied. The changes in surface conductivity due to the chemisorption of various gases such as H_2,CO,CO_2 and C_2H_4 on TiO_2/LiNbO_3 and SnO/LiNbO_3 were markedly greater than for the positive polar support than for the negative polar one, and the differences between the polar supports became larger with increasing ionization potential of the adsorbed gases. These polar direction-dependences were accounted for in terms of band bending caused in the semiconducting oxides by contact with LinbO_3 surface. For the Pddeposited SAW catalysts, the intensity of SAW was found to be sensitive to the adsorption of small amounts of O_2 and H_2. The SAW effects were examined for different kinds of catalytic reactions such as oxidation (CO+O_2, H_2+o_2), decomposition (CH_3OH, CH_3 OH+O_2) and hydrogenation (C_2H_4+H_2), and it was observed that the dynamic SAW effects were prominent for the reactions involving polar molecules.

Report

(3 results)
  • 1987 Annual Research Report   Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Yasunobu Inoue;Kazunori Sato;Osamu Hayashi: J. Chem, Soc. Farabay Trans. I.83. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasunoby Inoue;Osamu Hayashi;Kazunori Sato and Toyoyuki Kubokawa: "Proc. 9th International Congr. Catal. ," Elsevier,

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasunobu.Inoue,Kazunori.Sato,and Osamu.Hayashi: "Adsorptive Properties of Semiconducting thin NiO and TiO2 Films Combined with an Oppositely Polarized Ferroelectric Support" J.Chem. Soc., Faraday Trans. 1. 83. 3061-3068 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasunobu.Inoue,Osamu.Hayashi,Kazunori.Sato,and Toyoyuki,Kubokawa: Elsevier,. Polarization Direction Effects of Poled Ferroelectric Semiconductors, PbZr_<1-x> Ti_xO_3, upon Photocatalytic Decomposition of Water,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasunobu Inoue;Kazunori Sato;Osamu Hayashi: J.Chem.Soc.Faraday Trans.I.83. 3061-3068 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Yasunobu Inoue;Osamu Hayashi;Kazunori Sato;Toyoyuki Kubokawa: "Proc.9th International Congr.Catal.," Elsevier,

    • Related Report
      1987 Annual Research Report
  • [Publications] Yasunobu Inoue;Kazunori Sato;Osamu Hayashi: J.Chem.Soc.Faraday Transactions 【I】.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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