Development of gold deposited catalysts with soft Lewis acidic sites and its application into highly selective functionalization using molecular oxygen

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05143
• 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
• 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): 2021-04-01 – 2024-03-31
• Keywords: 触媒 / 金ナノ粒子 / 酸素酸化 / SMSI

Outline of Final Research Achievements

To increase the number of δ+ sites on the gold surface that contribute to the activation of the reaction substrate, we attempted to form oxidative strong metal－support interaction (SMSI) using various substituted hydroxyapatites as supports. In all cases, the formation of SMSI resulted in the coverage of the gold surface by the support and an increase in the number of δ+ sites on the gold surface. These catalysts were applied to synthesize ethyl esters, which are useful compounds for flavors and fragrances. The increased Auδ+ species promoted the activation of less reactive aliphatic aldehydes. The increased contact area between the gold and the support layer caused by SMSI facilitated the adsorption of substrates and the deprotonation of ethanol, allowing the reaction to proceed efficiently.

Free Research Field

固体触媒化学

Academic Significance and Societal Importance of the Research Achievements

高い触媒性能の発揮には、金粒子サイズの制御のみならず、酸素雰囲気下で生じる担体との強い相互作用(SMSI)により金粒子が被覆される担体層の厚さの制御が重要であることがわかった。今後、担体構造の制御を触媒設計の鍵とすることで、効率的な触媒探索が期待できる。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塩基を添加することなく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。