金属酸化物固定化金ナノ粒子の液相反応における触媒作用

概要

論文の詳細を見る
Catalytic properties of gold remarkably change by the size of gold particles and the kind of supports. An extremely high catalytic activity for aerobic oxidation of glucose was achieved when the size of gold could be minimized to about 3 nm on Al2O3 and ZrO2. On the other hand, Au/NiO exhibited higher catalytic activity than conventional gold catalysts such as Au/TiO2 for base-free aerobic oxidation of aliphatic alcohol to carboxylic acid with high selectivity (97%) at a full conversion. Gold on NiO also showed high selectivity to alcohol in the presence of amine and promoted the N-formylation of primary amine with methanol. Gold on ZrO2 showed the best catalytic activity and the selectivity for the N-alkylation of primary amine with alcohol to produce secondary amine. The surface hydroxyl groups would participate as acidic and/or basic sites for the adsorption of substrates, deprotonation of alcohol, and hydrogen transfer in the N-alkylation.