Preparation of gold clusters deposited catalysts using microwave and application for selective functionalization using molecular oxygen

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K05203
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: Yokohama National University (2020); Tokyo Metropolitan University (2018-2019)
• Principal Investigator: TAKETOSHI Ayako 横浜国立大学, 大学院工学研究院, 非常勤教員 (50533056)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 触媒 / 金クラスター / 金ナノ粒子 / 酸素酸化 / マイクロ波

Outline of Final Research Achievements

Gold clusters, which are smaller than 2 nm in diameter, could be deposited on metal oxide having high microwave absorption efficiency such as MnO2 by Deposition-precipitation method followed by microwave irradiation though the degree of reduction is still insufficient at 50%.
Selective esterification of aliphatic aldehydes and alcohols with ethanol in the absence of a base is a more difficult reaction than that with methanol. Gold nanoparticles on ZnO were found to be the most effective catalyst for the oxidative　esterification of octanal and 1-octanol to ethyl octanoate without a base. Au/ZnO exhibited the highest catalytic activity in both batch and flow reactors.

Free Research Field

固体触媒化学

Academic Significance and Societal Importance of the Research Achievements

金触媒調製時、担体のマイクロ波吸収効率が高い場合、マイクロ波加熱により還元まで行うことが、クラスターサイズの金を担持するのに有効であるとわかった。今後さらなる条件検討により還元度合を制御できれば、金クラスター触媒の一般的な調製法となることが期待できる。エチルエステル合成については、現行のプロセスではアルデヒドから2工程必要だが、金触媒を用いることにより1工程に短縮でき、化学プロセスのシンプル化につながる。