溶胶-凝胶法制备Fe掺杂MgF2催化剂及其催化1,1⁃二氟乙烷(R152a)脱HF反应的性能  

Fe⁃Doped MgF2 Catalyst:Preparation by Sol⁃Gel Method and Performance in Dehydrogenation of 1,1⁃Difluoroalkane(R152a)

作　　者：张蕾 李雨臻 李利春 韩文锋[1] 李瑛[1] 唐浩东[1] ZHANG Lei;LI Yu-Zhen;LI Li-Chun;HAN Wen-Feng;LI Ying;TANG Hao-Dong(Zhejiang University of Technology,College of Chemical Engineering,Hangzhou 310014,China)

机构地区：[1]浙江工业大学,化学工程学院,杭州310014

出　　处：《无机化学学报》2021年第1期39-46,共8页Chinese Journal of Inorganic Chemistry

基　　金：浙江省自然科学基金(No.LY19B060009)资助。

摘　　要：通过助剂掺杂的方法解决MgF2催化剂高温失活的问题。采用溶胶-凝胶法制备了一系列Fe^3+掺杂的高比表面MgF2催化剂,并通过N2吸附-脱附测试、X射线衍射(XRD)、能量色散X射线光谱(EDS)和NH3程序升温脱附技术(NH3-TPD)、电子自旋共振(ESR)、X射线光电子能谱(XPS)等对FeF3/MgF2催化剂的物化性质进行了表征。结果表明,一定量(物质的量分数小于20%)的Fe^3+掺杂可以有效地减少MgF2晶粒度,且随着Fe^3+掺杂量的增加,催化剂的比表面积、酸性及1,1-二氟乙烷(R152a,C2H4F2)脱HF反应的催化活性均呈现增加趋势,但当Fe^3+掺杂量超过20%时,催化剂明显失活。Herein,the deactivation problem of the MgF2 catalyst was solved via doping of Fe^3+into the catalyst.A series of Fe^3+doped MgF2 catalysts with different dopant concentrations were prepared via sol-gel method.The physio-chemical properties of the FeF3/MgF2 catalyst were examined by means of N2 gas adsorption-desorption,Xray diffraction(XRD),energy dispersive X-ray spectrometer(EDS)and NH3-temperature programmed desorption(NH3-TPD).Results show that small amount(molar fraction was less than 20%)of Fe^3+doping into MgF2 catalyst can effectively reduce the crystalline size of the catalyst.With concentration of Fe^3+below 20%,the specific surface area,surface acidity and catalytic activity towards the dehydrofluorination reaction of 1,1-difluoroethane(R152a,C2H4F2)increased with the increasing of dopant concentration.In contrast,FeF3/MgF2 catalyst deactivation occurred when dopant concentration was greater than 20%.

关 键 词：溶胶-凝胶法 MGF2 LEWIS酸 Fe^3+掺杂 脱氟化氢 

分 类 号：TQ174[化学工程—陶瓷工业]