| Project/Area Number |
14350421
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Tohoku University |
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Principal Investigator |
MURAMATSU Atsushi Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (40210059)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Katsutoshi Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (60343042)
SATO Nobuaki Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (70154078)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2003: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2002: ¥10,600,000 (Direct Cost: ¥10,600,000)
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| Keywords | Liquid phase reductive deposition / Metallic nanoparticle / Selective deposition / Nickel / Size control / Support effect / Hydrogenation catalyst / Growth mechanism / ナノ粒子 / 触媒 / 貴金属粒子 / 錯体 / 液相還元法 / 選択析出法 / 生成機構 / 表面設計 |
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| Research Abstract |
Since metallic nanoparticles have remarkably high surface energy, they easily aggregate each other to lose their characteristic properties based on their nano-scaled particle size. In this research project, single nano-sized metallic particles (<9nm) are deposited selectively on the surface of various supports by using the liquid phase reduction method in order to prevent the nano-sized particles from aggregation. The nanoparticles obtained are characterized in detail to investigate their physical and chemical properties and to reveal their growth mechanism. Their catalytic activities are also investigated and compared with those of nickel catalysts obtained by several conventional preparation methods.
(1)Selective deposition of Ni-Zn nanoparticle and its growth mechanism
Ni-Zn nanoparticles were successfully reduced from the liquid phase to be deposited selectively on supports such as TiO_2 particles (5-20nm). The studies on their growth mechanism indicated that metal complexes adsorbed
… More
on the support act as a nuclei for a nanoparticle. It is also revealed that the number of nuclei on the surface can be controlled by the addition of Zn to mother liquid. As a result, the particle size of metallic particles was precisely controlled.
(2)Characterization of nickel nanoparticles
The nickel nanoparticles were characterized by using HR-TEM, ESCA, EXAFS. It was revealed :
1.the size of nickel nanoparticle decreased by adding zinc to mother liquid.
2.nickel was successfully reduced to be a metallic nanoparticle, while zinc existed as an oxidized species.
(3)Catalytic activities of nickel nanoparticle
The catalytic activities of the nickel nanoparticles were estimated in the hydrogenation of 1-octene and carbon monoxide. The catalytic activities were highly improved by adding zinc presumably due to the smaller particle size. It was also indicated that the metallic nanoparticle was remarkably stabilized through the deposition onto the support (TiO_2) to maintain its high catalytic activity for a long time. Less
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