通过等体积浸渍法制备了金属有机骨架材料MIL-53(AI)(MIL:MaterialsofInstitutLavoisier)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一53(AI)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(AI)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2.21nm.该催化剂在CO氧化反应中表现出较高的催化活性,115℃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(AI) (MIL: Ma- terials of Institut Lavoisier), were prepared using the incipient wetness impregnation method. The struc- tures of the synthesized Pd/MIL-53(AI) 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(AI) before and after the catalytic reaction, confirming that the in- tegrity of the MIL-53(AI) support was maintained. The TEM results indicated that the crystalline porous structure of MIL-53(AI) 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 full conversion at 115 ℃. The catalytic activity and structure of Pd/MIL-53(AI) were stable after several reaction runs.