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（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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第1期129-134,共6页
Acta Physico-Chimica Sinica
基金
The project was supported by the National Natural Science Foundation of China(21073235,21173270,21177160)
National High-Tech Research and Development Program of China(863)(2013AA061902)~~
