金属有机骨架材料MIL-53（Al）负载纳米Pd颗粒：一种CO氧化的活性催化剂

摘要

通过等体积浸渍法制备了金属有机骨架材料MIL-53(Al)(MIL：Materials of Institut Lavoisier)负载纳米Pd催化剂.采用X射线衍射(XRD)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)等手段对催化剂的结构进行了表征.催化剂在反应前后XRD衍射峰保持不变,说明载体MIL-53(Al)具有良好的稳定性.采用TEM对催化剂进行表征,结果表明, MIL-53(Al)的多孔晶体结构有助于形成高度分散的纳米Pd颗粒,样品2.7%(w) Pd/MIL-53中Pd颗粒的平均粒径为2.21 nm.该催化剂在CO氧化反应中表现出较高的催化活性,115°C达到完全转化.同时催化剂可循环使用,多次反应后催化活性和催化剂结构都保持稳定.%Pd nanoparticles (NPs) supported on a metal-organic framework (MOF), MIL-53(Al) (MIL:Ma-terials of Institut Lavoisier), were prepared using the incipient wetness impregnation method. The struc-tures of the synthesized Pd/MIL-53(Al) catalysts were determined using X-ray diffraction (XRD), transmis-sion electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The same peaks were ob-served in the XRD patterns of Pd/MIL-53(Al) before and after the catalytic reaction, confirming that the in-tegrity of the MIL-53(Al) support was maintained. The TEM results indicated that the crystal ine porous structure of MIL-53(Al) favored the formation of highly dispersed Pd NPs of average size 2.21 nm. The het-erogeneous catalytic composite materials exhibited high activities for CO oxidation, with ful conversion at 115 °C. The catalytic activity and structure of Pd/MIL-53(Al) were stable after several reaction runs.