Polyimide Supported Bimetallic Platinum-Gold Nanoparticles Catalyst for Diphenylacetylene Hydrogenation

Abstract

本文通过化学亚胺法以三乙胺为催化剂，醋酸酐为脱水剂，将合成的聚酰胺酸稳定型铂金纳米粒子原位制备成聚酰亚胺负载的铂金合金纳米粒子。利用透射电子显微镜(TEM)，X射线衍射仪(XRD)，傅里叶变换红外光谱(FTIR)，X射线光电子能谱仪(XPS)，热重分析(TGA)分析技术对其进行表征，并且通过二苯乙炔选择性氢化实验对该铂金合金纳米粒子的活性及稳定性进行了探究。结果表明：铂金合金纳米粒子形貌规则尺寸均一，在60℃以水或乙醇作溶剂时纳米粒子都表现出了很高的催化活性以及单一选择性，并且可以多次回收重复利用。 In this study, we synthesized Pt-Au alloy nanoparticle in the poly(amic acid) (PAA) solution, and subsequently prepared polyimide-supported Pt-Au alloys nanoparticles (Pt-AuNPs/PI) by chemical imidization method using triethylamine and acetic anhydride. The Pt-AuNPs/PI were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, indicating that the Pt-AuNPs/PI with uniform morphology were well distributed in the polyimide. The catalytic properties of the supported Pt-AuNPs/PI were investigated for the hydrogenation of diphenylacetylene. High conversion and high selectivity were obtained in ethylalcohol or water at 60˚C. Furthermore, the catalysts can be recycled several times.