Highly stable Ag clusters developed by a combustion reaction

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14534
• 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: Kanazawa University (2023); Yamagata University (2022)
• Principal Investigator: Fujiwara Kakeru 金沢大学, 新学術創成研究機構, 助教 (70816628)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 気相合成 / 燃焼合成 / Ag触媒 / 固体触媒 / CO酸化 / Agクラスター

Outline of Final Research Achievements

Utilizing the interactions induced in Ag-TiO2 synthesized through the combustion synthesis, we successfully developed a catalyst with 20 wt% of Ag clusters (~2 nm). The effect of flame conditions and Ag content on the interaction between Ag and TiO2 were investigated resulting in the identification of optimal conditions for stabilizing the Ag clusters. The Ag clusters prepared using the flame synthesis demonstrated high oxidation catalytic activity, which enables the CO oxidation at room temperature. Additionally, the flame conditions to stabilize Ag cluster can be applied to various cluster catalysts (such as ZnO and VOx), revealing that these clusters efficiently facilitate CO2 hydrogenation reactions and oxidative coupling reactions.

Free Research Field

粉体製造プロセス

Academic Significance and Societal Importance of the Research Achievements

空気中に存在する有機物系の環境汚染物質を，外部からのエネルギー（加熱等）を必要とせず分解除去することは重要であるが，高価な貴金属触媒（AuやPt等）が必要であった。本研究の成果によって，貴金属の中で最も安価なAgでも室温で有機物の分解が可能となり，環境浄化分野への応用が期待できる。既存手法で合成されたAg触媒は室温での有機物分解反応に活性を有さないことから，燃焼合成法を利用することで高活性なAg触媒の開発に成功した。