| Project/Area Number |
14205115
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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 |
触媒・化学プロセス
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
AIKA Ken-ichi Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Professor, 大学院・総合理工学研究科, 教授 (20016736)
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| Co-Investigator(Kenkyū-buntansha) |
IZUMI Yasuo Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Lecturer, 大学院・総合理工学研究科, 講師 (50251666)
INAZU Koji Tokyo Institute of Technology, Frontier Collaborative Research Center, Research Associate, フロンティア創造共同研究センター, 助手 (70272698)
MIYAZAKI Akane Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Research Associate, 大学院・総合理工学研究科, 助手 (80293067)
NAKANO Yoshio Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Professor, 大学院・総合理工学研究科, 教授 (30092563)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥54,080,000 (Direct Cost: ¥41,600,000、Indirect Cost: ¥12,480,000)
Fiscal Year 2004: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
Fiscal Year 2003: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2002: ¥21,190,000 (Direct Cost: ¥16,300,000、Indirect Cost: ¥4,890,000)
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| Keywords | Surface structure effect / Nano crystals / platinum / Ruthenium / Alumina / Reverse micro-emulsion / Polyol method / Carbon covered nano-particles |
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| Research Abstract |
Through chloplatinic acid reduction with hydrogen under the existence of N-containing thermo-sensitive polymers, platinum nano-cubes having (100) plane are produced with the selectivity of 70%. These Pt cubes are supported on alumina surface and treated at 500℃, which still keeps the cubic structure. When the sample is used as a catalyst for NO-CH_4 reaction, the product selectivity was found to be different from the reaction over the conventional Pt/Al_2O_3 catalysts (usually having 111 face). So far, only the model reaction have been reported using the single crystals prepared in a vacuum system. Here, the surface controlled metals can be used for the practically reaction. A new method was also found to prepare pyramid nano crystals having (111) face.
At high temperature such as 1100℃, alumina get the alpha type whose surface area is extremely low (1m^2/g) and can not to be used for the high temperature reactions. The reverse micro-emulsion method where aluminium-alkoxide is hydroxyla
… More
ted in the micelles was improved a lot. After baking the gels at 1,100℃, various fine nano-particles are successfully formed depending on the Ba contents ; alpha alumina without Ba having 4 m^2/g, alpha alumina with Ba/Al=1/48 having 75 m^2/g, gamma alumina with Ba/Al=1/24 having 156 m^2/g, barium hexaaluminate with Ba/Al=1/12 having 98 m^2/g.
Alumina precursor containing organic species used for the reverse micro-emulsion method was baked under the inert gases at 1050-1350℃. This method gave gamma-alumina nano-crystals covered by carbon, which prevented the sintering of the oxide. The surface area of the sample was 35 m^2/g after baking at 1050℃, but the crystal size was just 4nm. This unique material contains both carbon and alumina on the surface and can be used for the special purpose (such as electron conducting material). This sample can finally be treated with air or water to recover the surface carbon at 500-800℃. Surprisingly high surface area (320 m^2/g) gamma alumina stable at 800℃ was produced for the first time. Less
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