蒙脱石负载钌纳米簇的制备及催化行为

PREPARATION OF RUTHENIUM NANOPARTICLES SUPPORTED ON MONTMORILLONITE AND THEIR CATALYTIC BEHAVIOUR

采用离子交换和原位还原方法,在加热回流条件下,使聚乙烯吡咯烷酮稳定的钌纳米簇负载在蒙脱石层间。采用X射线衍射、透射电镜、能谱分析对所制备的负载催化剂的结构和形貌进行了表征,以苯甲醇和分子氧的反应作为探针反应,考察了负载钌纳米簇催化剂在常压下对苯甲醇的催化氧化性能。结果表明,采用本方法可使聚乙烯吡咯烷酮稳定的钌纳米簇在蒙脱石层间形成共插层,钌纳米簇在层间分散度高,平均粒径23 nm;负载钌纳米簇的蒙脱石催化剂在常压下对苯甲醇的催化氧化具有较高的催化活性,苯甲醇表观活化能为33.4 kJ/mol。

Ruthenium nanoparticles stabilized by poly-N-vinyl-2-pyrrolidone （PVP） were successfully intercalated into the layer space of montmorillonite under refluxing by ion-exchange and in-suit reduction method. The structure and morphology of the obtained supported catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, and energy dispersive spectrometry （EDS）. The oxidation reaction of benzyl alcohol with molecular oxygen was used as probe reaction to investigate the catalytic activity of the supported ruthenium nanoparticles on the oxidation reaction under atmospheric pressure. It is found that the co-intercalation of ruthenium nanoparticles stabilized by PVP into the layer space of montmorillonite was realized by ion-exchange and in-suit reduction method. The intercalated ruthenium nanoparticles highly dispersed and the average particle size was about 23 nm. The ruthenium-based catalysts exhibited high catalytic activity for the oxidation of benzyl alcohol under atmospheric pressure, in which the apparent activation energy of benzyl alcohol was 33.4 kJ/mol.