单分散亚微HZSM-5分子筛的制备及其环己烯水合性能  

Monodisperse submicroscopic HZSM-5 zeolite:preparation and application in cyclohexene hydration

作　　者：魏珺芳[1] 王延吉[1] 励娟[1] 薛伟[1] 

机构地区：[1]河北工业大学绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《河北工业大学学报》2011年第4期20-25,共6页Journal of Hebei University of Technology

基　　金：973计划前期研究专项(2010CB234602);国家自然科学基金(20706011)

摘　　要：以硝酸铝(Al(NO3)3)、正硅酸乙酯(TEOS)、四丙基氢氧化铵(TPAOH)等为原料,采用动态水热合成法合成了高结晶度亚微HZSM-分子筛.通过X射线衍射(XRD)表征证明了采用动态水热合成法合成的HZSM-5分子筛结晶度较高.通过扫描电镜(SEM)观察了晶化温度、pH调节剂、添加表面活性剂以及晶化时间对HZSM-5分子筛形貌及晶粒大小的影响:变温晶化可使HZSM-5分子筛的形貌规整程度提高,平均粒径减小;pH调节剂对分子筛形貌影响较小;表面活性剂可对分子筛的生长起到约束作用,适宜表面活性剂的加入可使HZSM-5分子筛生长成为圆饼状,形状规整且大小均一,其中晶粒较小的分子筛其平均粒径为0.3 m;延长晶化时间可使分子筛粒径从0.3 m增大至3.5 m,形貌由圆饼状趋向于正方体.粒径较小的亚微HZSM-5分子筛在环己烯水合反应中体现出良好的催化性能.A submicroscopic HZSM-5 zeolite was prepared by dynamic hydrothermal synthesis method with aluminum nitrate（AlNO）,tetraethyl orthosilicate（TEOS）,and tetrapropyl ammonium hydroxide（TPAOH） as raw materials.X-ray diffraction（XRD） characterization results showed that the crystallinity of HZSM-5 was high.The influence of crystallization temperature,pH regulators and surfactants on morphology and particle size of HZSM-5 is represented by scanning electronic microscopy（SEM） characterization：HZSM-5 with more regular morphology and smaller particle size can be prepared by varying-temperature synthesis method.The pH regulators have little influence on morphology and particle size of HZMS-5.Surfactants can constrain the crystallization of HZSM-5.The monodisperse HZSM-5 shaped like cakes is synthesized with suitable surfactants as additives.The average particle size is 0.3 μem.The particles will grow up to 3.5 μem with the crystallization time prolonged.The monodisperse HZSM-5 shaped like cakes in small particle size has shown excellent catalytic activity on cyclohexene hydration.

关 键 词：亚微 HZSM-5 单分散 环己烯 水合 

分 类 号：O643.3[理学—物理化学] TQ203.2[理学—化学]