Development of Gold Nanoparticle Catalysts Having Cationic Au Sites and Its Application into Chemical Processes for Valuable Organic Compounds

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05152
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27030:Catalyst and resource chemical process-related
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Ishida Tamao 東京都立大学, 都市環境科学研究科, 准教授 (90444942)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 金ナノ粒子 / 強い金属ー担体相互作用 / ソフトルイス酸

Outline of Final Research Achievements

Cation- or anion-substituted hydroxyapatite (HAP)-supported gold (Au) catalysts were heat-treated in an oxidative atmosphere to exhibit partial SMSI in which HAP thin layers covered the Au surface. Cationic properties of Au was increased by the formation of strong metal-support interaction (SMSI). Au/HAP with SMSI exhibited superior catalytic activity to Au/HAP without SMSI for alkene activation reactions, even though the particle sizes of Au were almost the same.
We also attempted to create Au-oxide interface on the surface of the Au nanoparticles by covering the Au surface by layer-double hydroxide (LDH) monolayer nanosheets, which is converted into mixed metal oxides (MMO). Although Au/SiO2 showed poor activity for CO oxidation, MMO-coated Au/SiO2 exhibited remarkable improved catalytic activity, which suggested that Au-MMO interface was formed on the Au particle surface and the interface played an important role as an active site for CO oxidation.

Free Research Field

触媒化学

Academic Significance and Societal Importance of the Research Achievements

金触媒はパラジウムや白金触媒とは異なる触媒特性を示すなど、興味深い特徴を有するが、凝集しやすいなどの問題点がある。SMSIで金表面を一部被覆すると、熱安定性や触媒の耐久性は向上する一方で、初期活性は低下する傾向にあった。本研究では、SMSIによって増大する金のカチオン性を利用することで、触媒の耐久性と同時に触媒活性の向上が図れることを見出した。この知見は、金触媒の実用化に展開する上で有益である。