纳米片状MCM-22沸石的合成及表征  

Synthesis and characterization of nanosheets MCM-22 zeolite

作　　者：张婷[1] 张磊[1] ZHANG Ting;ZHANG Lei(College of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu Province,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化学工程》2020年第7期16-21,共6页Chemical Engineering(China)

基　　金：江苏省高等学校自然科学研究面上项目(18KJB530002);江苏省“六大人才高峰”高层次人才项目(2018-XCL-100)。

摘　　要：采用动态水热合成的方法,以环己亚胺(HMI)为模板剂,合成了纳米片状MCM-22沸石。并考察了不同硅源、HMI用量以及碱源对沸石合成的影响规律。结果表明:以硅溶胶为硅源时,在较宽的硅铝摩尔比范围(SiO2/Al2O3,30-100)内得到高结晶度的MCM-22沸石;而以气相二氧化硅为硅源时,则在较窄的硅铝比范围内(30-70)才能得到结晶度较好的沸石样品;用NaF或KF为碱源,代替传统的NaOH,同样能够合成高结晶度MCM-22沸石。上述合成的MCM-22沸石样品具有纳米片交错堆积的花状形貌,比表面积为500-600 m^2/g,总孔容为0.4-0.6 cm^3/g。此外,以MCM-22沸石为模板,通过高温分解乙烯将碳沉积到沸石片的表面,除去MCM-22沸石后,获得纳米多孔碳材料。Nanosheets MCM-22 zeolite was prepared by dynamic hydrothermal synthesis method using hexamethyleneimine as structure-directing agent(SDA).The effect of silica source,SDA amount,and alkaline source on the synthsized MCM-22 zeolite was studied.The MCM-22 zeolite with high crystallinity was synthsized using silicon gel with a SiO2/Al2O3 mole fraction range of 30-100,while using fumed silica with a SiO2/Al2O3 range of 30-70.Instead of NaOH by NaF or KF as alkane source,pure MCM-22 with high crystallinity was also synthsized.The prepared MCM-22 zeolite had a BET surface area of 500-600 m^2/g and a pore volume of 0.4-0.6 cm^3/g.In addition,nanoporous carbon materials could be easily prepared by the decomposition of ethylene onto the MCM-22 surface at high temperature.

关 键 词：MCM-22沸石 纳米材料 高稳定性 多孔碳 

分 类 号：TQ426[化学工程]