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1996 Fiscal Year Final Research Report Summary

Effects of Resonance Oscillation on Activation of Thin film Catalysts Deposited on a Ferroelectric Substrate

Research Project

Project/Area Number 07454185
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionNagaoka University of Technology

Principal Investigator

INOUE Yasunobu  Nagaoka University of Technology, Faculty of engineering, Department of Chemistry, Professor, 工学部, 教授 (30016133)

Project Period (FY) 1995 – 1996
KeywordsAcoustoelectric effects / Catalytic activity / Artificial Control / Ferroelectrics / Resonance effects / Lattice displacement
Research Abstract

In an attempt to design a heterogeneous catalyst with artificially controllable functions, resonance oscillation phenomena generated on a ferroelectric crystal by applying radio frequency electric power were applied. A poled ferroelectric single crystal of lithium niobate (LiNbO_3) was used as a substrate, on which either Pd film or Al was deposited. These metal films were used not only as a catalyst but as an electrode to introduce rf power. In the catalytic ethanol oxidation on a 40 nm thick Pd film deposited on LiNbO_3, resonance oscillation at a frequency of 3.4 MHz at a power of 3 W caused an immediate increase in acetaldehyde production by a factor of 1900, and the high activity was maintained until the power was turned off. The application of non-resonance frequency caused no significant activity enhancement. The activation energy of the reaction was 156 kJ mol^<-1> with power-off, whereas it decreased dramatically to 12 kJ mol^<-1> with power-on. For a sample using a catalytically inactive Al thin film, little increase in catalytic activity was observed. Surface potential measurements showed that the resonance frequency affected the distribution of electrons at surfaces, whereas no change occurred when non-resonance frequency was applied to the catalyst. A laser Doppler method was employed to measure lattice displacement. On the basis of these results, the effects of resonance oscillation which lead to the anomalous enhancement of catalytic activity are considered to be associated with the lattice displacement of catalyst surface and changes in the surface potential.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Y. Ohkawara, N. Saito, and Y. Inoue,: "Effects of resonance oscillation on catalytic activity of a thin Pd film deposited on polar ferroelectric surface" Surface Science. 357/358. 777-780 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Saito, Y. Ohkawara, Y. Watanabe, and Y. Inoue,: "Anomalous enhancement of catalytic activity over a Pd thin film by the effects of resonance oscillation generated on a ferroelectric substrate" Surface Science. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井上泰宣、渡邊幸久、大河原 譲: "制御機能をもつ固体触媒設計のための弾性表面波および共振現象の応用" 日本化学会誌(総合論文). (4). 317-324 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ohkawara, N.Saito, and Y.Inoue: "Effects of resonance oscillation on catalytic activity of a thin Pd film deposited on polar ferroelectric surface." Sur. Sci.357/358. 777-780 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Saito, Y.Ohkawara, Y.Watanabe, and Y.Inoue: "Anomalous enhancement of catalytic activity over a Pd thin film by the effects of resonance oscillation generated on a ferroelectric substrate." Sur. Sci.(in press.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inoue, Y.Waranabe, and Y.Ohkawara: "Design of Hetereogenerous Catalysts with Artificial Cotrollable Functions by Surface Acosutic Waves and Resonance Oscillations generated on Ferroelectric Substrates" Nihon Kagaku Kiashi. (4). 317-324 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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