表面修饰铂的铜纳米颗粒的制备及催化性能

Synthesis of solvent-stabled copper nanoparticles surface-modified with platinum and their catalytic properties

为探索表面修饰铂的铜纳米颗粒的催化性能,分别以硫酸铜、氯铂酸为前驱物、硼氢化钾为还原剂制备了溶剂稳定的铜和铂纳米颗粒;并以铜纳米颗粒为种子、将氯铂酸溶解其中,在以硼氢化钾为还原剂的基础上制备了表面修饰了铂的铜纳米颗粒。所制备的三种纳米颗粒均为球形,粒径分别为1.7 nm、2.1 nm、2.4 nm.在30℃、1.01×105Pa的条件下,所制备的表面修饰了铂的铜纳米颗粒在环己烯的催化加氢反应中具有比铂纳米颗粒和铜纳米颗粒更高的催化活性。

To investigate the catalytic activities, solvent-stabled copper nanopartieles and platinum nanopartieles were synthesized hy using precursors of CuSO4· 5H2O and H2PtCl6 and reducing agent of KBH4, respectively. Copper nanoparticles surface-modified with platinum was then synthesized by using the copper sol, H2PtCl6 and reducing agent of KBH4. The copper, platinum and copper nanoparticles sunface-modified with platinum were 1.7, 2.1 and 2.4 nm in diameter respectively. This kind of surface-modified catalyst shows much greater catalytic activities than both the platinum nanopartides and copper nanoparticles in the reaction of hydrogenation of cyclohexene at the reaction temperature of 30 ℃ and the atmospheric pressure of 1.01 × 10^5 Pa.