| Project/Area Number |
15206088
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Catalyst/Resource chemical process
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
INOUE Yasunobu Nagaoka University of Technology, Department of Chemistry, Professor, 工学部, 教授 (30016133)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIYAMA Hiroshi Nagaoka University of Technology, Analysis Center, Assistant Professor, 分析計測センター, 助手 (50303186)
SAITO Nobuo Nagaoka University of Technology, Analysis Center, Assistant Professor, 分析計測センター, 助教授 (40313572)
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| Project Period (FY) |
2003 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥46,280,000 (Direct Cost: ¥35,600,000、Indirect Cost: ¥10,680,000)
Fiscal Year 2006: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2005: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2004: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Fiscal Year 2003: ¥20,800,000 (Direct Cost: ¥16,000,000、Indirect Cost: ¥4,800,000)
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| Keywords | Resonance oscillation / Ferroelectric crystals / Catalysts / Acoustic waves / Reaction selectivity / Activity / Lattice distortion / Work function / 強誘電体基板 / Pt触媒 / AgAu合金触媒 / 強誘電体 / 反応選択性制御 / エタノール分解反応 / 銀触媒 / 共鳴震動効果 / AgCu合金触媒 / Mo担持Pd触媒 / エチレン酸化 / 仕事関数 / Pd / 選択性 / 膜厚依存性 |
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| Research Abstract |
Resonance oscillation (RO) of bulk acoustic waves generated by piezoelectric effects on poled ferroelectric crystals by rf electric power causes the dynamic distortion of thin metal film surfaces deposited. In C_2H_5OH and CO oxidation and C_2H_5OH decomposition on Ag and Pd catalysts, thickness-extension mode RO (TERO) was found to have a capability of enhancing not only catalytic activity, but also reaction selectivity. In contrast, thickness-shear mode resonance oscillation (TSRO) showed no activation effects. Laser Doppler and photoemission spectroscopic measurements showed that TERO caused large lattice displacement vertical to the surface and to induce work function shifts of the metal catalysts, whereas no such changes occurred with TSRO. The TERO effects on catalyst activation depended on the polarization direction of ferroelectric substrates and resonance frequency, indicating that large vertical lattice displacement and the density of sites causing lattice displacement are responsible for strong catalyst activation. The TERO effects were intrinsically different in ethanol decomposition between Ag and AgAu alloy catalysts. TERO-induced activation occurred only for ethylene production on a Ag metal, whereas TERO effects had strong dependence on alloy compositions. The activation for ethylene production was nearly independent of alloy composition, but that for acetaldehyde production exhibited a maximum at around 80% surface Au content where the vertical lattice displacement became the smallest. Thus, it was proposed that the TERO effects on acetaldehyde production over the AgAu binary alloy catalysts increased in the case where Ag-Au atom interactions became strong. The RO effects on heterogeneous catalysis by metals are new phenomena and are concluded to be quite useful for the development of a heterogeneous catalyst with artificially controllable functions for chemical reactions.
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