Wang Kang, Davies-Jones Josh, Graf Arthur, Carravetta Marina, Davies Philip R, Pera-Titus Marc
Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K.
School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K.
ACS Catal. 2024 Jul 19;14(15):11545-11553. doi: 10.1021/acscatal.4c00909. eCollection 2024 Aug 2.
Amphiphilic Janus silica particles, tunable with oleophobic-oleophilic properties and low fluorine content (8 wt % F), exhibited prominent foamability for a variety of aromatic alcohols at low particle concentrations (<1 wt %) compared to randomly functionalized silica particles. When selectively loaded with Pd nanoparticles on the oleophilic hemisphere, the particles displayed more than a 2-fold increase in catalytic activity for the aerobic oxidation of benzyl alcohol compared to nonfoam bulk catalysis under ambient O pressure. The particles were conveniently recycled with high foamability and catalytic activity maintained for at least five consecutive runs.
两亲性Janus二氧化硅颗粒具有疏油亲油特性且氟含量低（8 wt% F），与随机功能化的二氧化硅颗粒相比，在低颗粒浓度（<1 wt%）下对多种芳香醇表现出显著的发泡性。当在亲油半球上选择性负载钯纳米颗粒时，与在环境氧压力下的非泡沫本体催化相比，该颗粒对苯甲醇的有氧氧化催化活性提高了两倍多。这些颗粒便于回收，且至少连续五次保持高发泡性和催化活性。
