纳米ZSM-5/MCM-41二级孔材料的微波合成与性能

摘要

The seriflux of silica and aluminum was rapidly obtained from the alkali-treated nano ZSM-5 molecular sieves etched by microwave digestion.Then,ZSM-5/MCM-41 secondary porous materials with a hollow structure were fabricated under a certain condition by using cetyltrimethyl ammonium bromide(CATB) micelles as templates.The synthesis conditions,such as etching time,pH,and synthesis time,were systematically investigated.The products were characterized by XRD,SEM,TEM,and N2 physical adsorption.The optimal synthesized conditions for ZSM-5/MCM-41 secondary porous materials were fixed as following:by adjusting the pH of the system to 10.0,reaction temperature to 120 ℃,the secondary porous materials,including ZSM-5 and MCM-41,can be synthesized under microwave irradiation for 30 min by using CATB as the template.The obtained ZSM-5/MCM-41 secondary porous materials contained microporous and mesoporous structures with the pore volume of 0.816 mL/g and special surface area of 872 m2/g.%以纳米ZSM-5分子筛为原料,在碱液中,采用微波法快速消解获得硅铝源,以十六烷基三甲基溴化铵形成的胶束为模板,制备具有空心结构的ZSM-5/MCM 41二级孔材料,优化了反应温度、消解时间、晶化时间、体系pH等条件对材料合成的影响.并采用XRD、SEM、TEM、N2物理吸附等手段对合成产物进行了表征.实验结果表明,ZSM-5/MCM-41二级孔材料的最优合成条件为:反应温度为120℃,消解时间为30 min,晶化时间为30 min,体系pH=10.0.表征结果显示,所得ZSM-5/MCM-41二级孔材料具有微孔和介孔两种孔道结构,孔体积为0.816 mL/g、比表面积可达872 m2/g.