准均相的铂钯合金纳米催化剂用于芳香族化合物脱卤反应  

Quasi-homogeneous PtPd Alloy Nanocatalyst and Its Catalytic Performance in the Dehalogenation of Aromatic Compounds

作　　者：张燮义 谢光友 李衡峰[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《分子催化》2018年第1期46-53,共8页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(51573209)~~

摘　　要：用一锅法合成的负载于聚酰胺酸盐上的铂钯纳米催化剂,可以通过调节溶液的p H值实现催化剂与反应体系的有效分离和循环利用.准均相的铂钯催化剂应用于水相中卤代芳香族化合物的氢化脱卤反应,转化率达到99%以上,并且在重复使用5次后仍然保持很高的活性.铂钯双金属催化剂拥有比单一金属铂或者钯更高的催化活性,这主要是由于铂钯合金在催化反应时具有协同效应.利用X射线衍射仪(XRD),透射电子显微镜(TEM)等方法对催化剂进行了表征.数据表明铂钯纳米粒子负载于聚酰胺酸上以后可以在水溶液中稳定存在并且处于均匀的分布状态,纳米粒子尺寸约为4 nm.The quasi-homogeneous catalyst of platinum-palladium alloy nanoparticles supported on poly（amic acid） salt were prepared by one-pot synthesis, it could be effectively separated for recycling by adjusting the pH value of the solution. The platinum-palladium quasi-homogeneous catalyst is applied to the dehalogenation reaction and has achieved very high conversion. Platinum-palladium bimetallic catalyst also has a higher catalytic activity than platinum or palladium alone. The catalysts were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. Platinum-palladium nanoparticles are supported on poly（amic acid） and are in a homogeneous distribution with a nanoparticle size of about 4 nm. The results show that the platinum and palladium nanoparticles are due to the synergistic effect after forming the alloy, which lead to the excellent dehalogenation ability.

关 键 词：聚酰胺酸盐 铂钯合金纳米粒子 准均相催化 卤代芳香族化合物 脱卤反应 

分 类 号：O643.32[理学—物理化学]