讲座主题：Recent progress of gold nanoparticle catalysts and their application for air purification

专家姓名：Toru Murayama

工作单位：Tokyo Metropolitan University

讲座时间：2023年3月9日 14:30

讲座地点：化学馆东320

主办单位：tyc1286太阳集团化学化工学院

内容摘要：

Recent research on gold nanoparticle catalysts is presented here as an example of our work.In methods for removing odorous and harmful substances from the exhaust gas of chemical industry plants and living environments by selective catalytic oxidation, it is necessary to lower the reaction temperature from the viewpoint of saving energy. Supported gold nanoparticle catalysts that can catalytically remove CO and NH3at room temperature have been developed. Nb2O5and Ta2O5are classified as acidic oxide, and the surface of the oxides is negatively charged due to their low isoelectric point. The widely used deposition precipitation method using HAuCl4precursor has been difficult to deposit gold nanoparticles because the gold precursors existing as anions do not interact with each other. The colloidal sol immobilization method was applied to deposit gold on Nb2O5and Ta2O5and we successfully prepared Au/Nb2O5and Au/Ta2O5with average gold particle sizes of ca. 2.7 nm. These Au/Nb2O5and Au/Ta2O5catalysts showed 100% conversion for CO oxidation (1% CO in air, SV= 20000 mL h-1gcat-1) at room temperature. The Au/Nb2O5catalyst showed 20% conversion with 100% selectivity to N2for NH3selective catalytic oxidation (50 ppm NH3in air, SV= 40000 mL h-1gcat-1) at room temperature. The catalytic activity depended on the crystal structure of the support, andBrönstedacid sites on the support surface were important for obtaining high selectivity to N2in the case of selective catalytic oxidation of NH3. The synergy of oxidation ability of gold nanoparticles and acid sites of the support will expand the possibilities in the field of catalyst reactions.

主讲人介绍：

Toru Murayama received a Ph.D. degree in 2010 from Tokyo Institute of Technology. He was appointed Assistant Professor at Catalysis Research Center (now Institute of Catalysis), Hokkaido University in 2010. In 2015, he became a Project Associate Professor at the Research Center for Gold Chemistry, Tokyo Metropolitan University, and he was promoted to Project Professor in 2016. From 2020, the research center has been integrated into the Research Center for Hydrogen Energy-based Society (ReHES). He has also been a professor at Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (Au-SDARC), Yantai University since 2020. He also joins Haruta Gold Incorporated, which is a company based on research at Tokyo Metropolitan University, from 2015.