| Project/Area Number |
07650941
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Tottori University |
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Principal Investigator |
NIWA Miki Tottori University, Faculty of Engineering, Professor, 工学部, 教授 (10023334)
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| Co-Investigator(Kenkyū-buntansha) |
KATADA Naonobu Tottori University, Faculty of Engineering, Assistant Professor, 工学部, 講師 (00243379)
金 鐘鎬 鳥取大学, 工学部, 助教授 (60240751)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Tin oxide / Silica / Template / Sensor / Adsorption / Benzaldehyde / Alumina |
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| Research Abstract |
Benzaldehyde is adsorbed on such a basic metal oxide as tin oxide to form a stable benzoate anion. On the other hand, the chemical vapor deposition of silicon alkoxide forms a monolayr of silica to cover the surface completely. By combining these two phenomena, a novel technique was investigated to obtain a silica overlayr possessing a molecular sieving property : the chemical vapor deposition of silicon alkoxide was done on tin oxide after the benzoate anion had been adsorbed, and the pre-adsorbed species playd a role of template and was finally removed.
The conditions of preparation was determined based on the preliminary experiments. The adsorption behavior of benzaldehyde was that of the chemisorption and controlled by the temperature. The deposition amount of silicon alkoxide was controlled by the hydrolysis of alkoxide anchored on the surface.
The adsorption property of thus prepared sample was first examined for the adsorbates with various molecular sizes. The molecular sieving property was observed : the molecule larger than the template molecule became hard to be adsorbed.
The application to the gas sensor was then examined. For this purpose, about a half of the coverage by the template and another half of the converge by silica were suitable. On such a sample, the sensing property was controlled by the molecular size for various aldehydes, alcohols, alkanes and aromatic hydrocarbons.
Furthermore, naphtaldehyde was used as the template in place of the benzaldehyde. The molecular sieving property was also obtained, and clarified to be controlled by the template molecular size.
Alumina was also used as the support. It has been clarified that the chemical vapor deposition of silica on alumina generated the solid acidity, and the acidity was controlled by the microstructure. The density of pre-adsorbed template strongly affected the acidity, showing the microstructure of silica was controlled by the template molecule.
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