【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Fe³⁺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Fe³⁺掺杂可以有效地减少MgF₂晶粒度,且随着Fe³⁺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Fe³⁺掺杂量超过20%时,催化剂明显失活。更多还原

【Abstract】 Herein, the deactivation problem of the MgF₂ catalyst was solved via doping of Fe³⁺ into the catalyst. A series of Fe³⁺ 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 Fe³⁺ doping into MgF₂ catalyst can effectively reduce the crystalline size of the catalyst. With concentration of Fe³⁺ below 20%, the specific surface area, surface acidity and catalytic activity towards the dehydrofluorination reaction of 1,1-difluoroethane（R152 a,C₂H₄F₂） increased with the increasing of dopant concentration. In contrast, FeF₃/MgF₂ catalyst deactivation occurred when dopant concentration was greater than 20%.更多还原