Fundamental study on the synthesis of transition metal nanoparticles for the environmentally benign process using supercritical water

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15348
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 27020:Chemical reaction and process system engineering-related
• Research Institution: Tohoku University
• Principal Investigator: Seong Gimyeong 東北大学, 未来科学技術共同研究センター, 助教 (30747259)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 超臨界水 / ナノ / 触媒 / 金属 / 合成 / 非平衡 / 熱力学 / 反応速度

Outline of Final Research Achievements

In this study, to minimize the use of organic solvents, metal nanoparticles are synthesized using supercritical water with a flow-type reactor. Hydrogen is difficult to dissolve in water, but it can dissolve in high temperature and high-pressure water. The reducing potential of hydrogen in high-temperature and high-pressure water was estimated using the equation of state and fed back to nanoparticle synthesis. Here, a flow-type reactor with a short heating process and reaction time is applied. The operation parameters such as oxide concentration and size were obtained. The entire reaction mechanism that is necessary for designing the metal nanoparticle synthesis process was understood.

Free Research Field

化学工学

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、超臨界水での水素の還元ポテンシャルを求め、通常還元しにくい金属種を還元できるようにすることにある。プロセスの観点から見ると非平衡反応系は酸化物の初期生成を抑制し、金属の還元をより容易にすることができる。従って、これらの技術が産業化につながるのであれば、より環境に優しい方法で、金属ナノ粒子を大量に生産することができるので社会的意義は大きいと考えられる。