单壁碳纳米管自还原法制备负载Pt催化剂及其催化性能

Preparation of SWNTs/Pt Composites Using SWNTs as Reducing Agent and Their Catalytic Properties

金属Pt是良好的催化加氢、脱氢催化剂,利用单壁碳纳米管(SWNTs)自身的还原性,将K2PtC l6溶液中的Pt直接还原并负载在SWNTs表面上,制备了具有良好催化性能的SWNTs/Pt负载型催化剂.通过TEM,XPS和TG对材料进行了表征,研究了K2PtC l6浓度及溶剂对Pt负载量、粒径的影响,并测试了SWNTs/Pt的催化性能.实验结果表明,SWNTs负载的Pt颗粒小,分散均匀,负载量高,与SWNTs结合紧密,催化性能好,是催化加氢和脱氢反应的良好催化剂.

SWNTs/Pt composites for catalysis were prepared through redox reaction between SWNTs and K2PtCl6. Characterization of the composites by TEM, XPS and TG techniques revealed that large quantities of Pt particles with diameters of - 1.5 nm distribute evenly on the SWNTs. The influences of concentration of K2PtCl6 solution and solvents of SWNTs on the quantity and size of Pt particles were investigated. SWNTs/Pt composites containing 24. 76% （mass fraction） Pt were obtained using high purity SWNTs and K2PtCl6 solution of 10 mmol/L. The SWNTs/Pt composites exhibit high catalytic activity for hydrogenation of cyclohexene. The conversion rate from cyclohexene to cyclohexane is up to 100% at room temperature.