高选择性部分氧化催化剂Au-Pd/TiO2-SiO2的设计合成与苯甲醇部分氧化反应OACSTPCD

Noble metal nanoparticle catalysts exhibit high catalytic activity in the partial oxidation of benzyl alcohol to benzal-dehyde.However,the selectivity of benzaldehyde is low.TiO2 modified Au-Pd/TiO2-SiO2 nano alloy catalysts were prepared by a one pot method and applied for benzyl alcohol partial oxidation.It is found that the introduction of a small amount of TiO2 increases the metal dispersion on the support surface,and modifies the electronic structure of the Au-Pd alloy surface,and improves the reaction activity.Also,the number of Lewis acid sites on the support surface are increased,which improves benzaldehyde selectivity.However,the introduction of a large amount of TiO2 destroys the alloying of Au-Pd and produces a large number of Bronsted acid sites,which greatly reduces the reaction activity and product selectivity.