摘要
通过溶胶凝胶法制备了一系列不同Nb2O5质量含量的Nb2O5-SiO2载体及其负载的Pt催化剂,并应用于甘油氢解制备1,3-丙二醇反应,采用X射线衍射、H2程序升温还原、透射电镜、X射线光电子能谱仪、NH3程序升温脱附与CO傅里叶漫反射红外光谱等手段对复合载体及其负载的Pt催化剂进行了系统的表征。研究结果表明:Nb2O5的改性提高了Pt的分散度及其与复合载体间的相互作用,显著增加了催化剂表面酸中心数量,从而显著提升催化甘油氢解活性。其中Nb2O5含量为5%的Pt/5Nb2O5-SiO2催化剂具有最多酸中心与最佳Pt分散度,表现出了最高的甘油氢解活性。
A series of Nb2O5-SiO2 supports were synthesized by sol-gel method and Pt/Nb2O5-SiO2 catalysts were prepared by impregnation method.These catalysts were examined in a 100 mL stainless steel autoclave for glycerol hydrogenolysis.The physiochemical properties of the composite supports and catalysts were investigated by the techniques of X-ray diffraction,H2 temperature-programmed reduction,transmission electron microscopy,X-ray photoelectron spectroscopy,NH3 temperature-programmed desorption and in-situ CO adsorption diffuse reflectance infrared Fourier transform spectroscopy.Results demonstrated that the modification of Nb2O5 enhanced the dispersion of Pt and its interaction with the composite supports,significantly increased the amount of acid sites,thus enhanced the catalytic activity of glycerol hydrogenolysis.Pt/5Nb2O5-SiO2 catalyst with the most acid sites and optimum Pt dispersion showed the best performance in glycerol hydrogenolysis.
作者
刘路易
任鑫
周静红
周兴贵
LIU Luyi;REN Xin;ZHOU Jinghong;ZHOU Xinggui(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《化学反应工程与工艺》
CAS
北大核心
2019年第2期97-105,共9页
Chemical Reaction Engineering and Technology
基金
国家重点研发计划(2018YFB0604704)。
关键词
五氧化二铌
铂
溶胶凝胶法
甘油氢解
1
3-丙二醇
niobium oxide
platinum
sol-gel method
glycerol hydrogenolysis
1,3-propanediol
