摘要
采用共沉淀法、沉积-沉淀法和改性沉积-沉淀法制备了Au/Fe2O3催化剂,运用N2吸附、X射线衍射、X射线光电子能谱和透射电镜等技术对其进行了表征,考察了制备方法对Au/Fe2O3催化剂水煤气变换反应催化活性的影响.结果表明,改性沉积-沉淀法制备的催化剂具有最好的催化活性,150℃时CO转化率达82.3%.该催化剂比表面积较大,金粒子尺寸（3-5nm）较小且分布均匀.载体氧化铁以无定形态和结晶态共存,金与载体间存在较强的相互作用,这对催化剂活性的提高起着重要作用.
The Au/Fe2O3 catalyst was prepared by co-precipitation, deposition-precipitation, and modified deposition-precipitation methods and was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The catalyst activity for the water-gas shift （WGS） reaction was discussed. Under strictly controlled conditions, the Au/Fe2O3 catalyst prepared by modified deposition-precipitation displayed higher activity for the WGS reaction than that prepared by co-precipitation and deposition-precipitation. In the former case, the CO conversion of 82.3 % was obtained with a feed gas of 10 % CO/N2 at 150 ℃ . Where-in, gold particles of 3-5 nm were highly dispersed on the surface of the Fe2O3 support that existed in an amorphous and crystalline state. A relatively strong interaction between gold particles and the support occurred, which was beneficial for the WGS reaction.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期346-350,共5页
基金
国家自然科学基金(20771025)
福建省科技计划项目(2002H026).
关键词
改性沉积-沉淀法
氧化铁
负载型金催化剂
水煤气变换反应
modified deposition-precipitation
iron oxide
supported gold catalyst
water-gas shift reaction
