摘要
采用共沉淀法制备铁酸锌催化剂,考察改性元素Mg、B、Zr、Ce、La对铁酸锌催化剂结构和丁烯氧化脱氢性能的影响。采用XRD、TEM和N2吸附-脱附对镧改性铁酸盐催化剂进行金属元素组成的优化研究,确认镧元素在催化剂中存在的形态和作用。结果表明,La改性铁酸锌催化剂晶粒粒径(20~50) nm,具有较大的比表面,主要活性组分是α-Fe2O3和ZnFe2O4,催化剂的活性随着Fe含量的升高而升高,n(Fe)∶n(Zn)∶n(La)=4∶1∶1催化剂具有最高的催化活性,反应温度380℃时,其TOF值2.1×10^-3 molbutene·molsurface-Fe·s^-1。
Zinc ferrite catalysts were prepared by coprecipitation method,and the modification of zinc ferrite catalysts with Mg,B,Zr,Ce and La,and the effect of these elements on the structure and catalytic performance of zinc ferrite catalysts were investigated,respectively.The lanthanum modified ferrite catalysts with a higher catalytic activity for the oxidative dehydrogenation of butene to butadiene were studied by XRD,TEM and N2 adsorption-desorption to screen optimal metal composition of catalyst,and clarify the morphology and function of lanthanum in the catalysts.La-modified zinc ferrite catalyst possessed a large specific surface area with a crystal size of(20-50) nm.It had been found that the active components of the La-modified ferrite catalysts were α-Fe2O3 and ZnFe2O4.The activity of catalyst increased with increasing Fe content.The La-modified catalyst with n(Fe)∶n(Zn)∶n(La)=4∶1∶1 possessed the highest activity with a turnover frequency(TOF) of 2.1×10^-3 molbutene·molsurface-Fe·s^-1 at 380 ℃.
作者
吴志杰
吴宇辰
窦涛
Wu Zhijie;Wu Yuchen;Dou Tao(State Key Laboratory of Heavy Oil Processing and CNPC Key Laboratory of Catalysis,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《工业催化》
CAS
2019年第11期30-36,共7页
Industrial Catalysis
基金
国家自然科学基金(U1662131)资助项目
关键词
催化剂工程
铁酸锌
1
3-丁二烯
氧化脱氢催化剂
catalyst engineering
zinc ferrite
1,3-butadiene
oxidative dehydrogenation catalyst