铝改性硅溶胶合成ZSM-5分子筛方法的研究  

Research on synthesis method of ZSM-5 molecular sieve from aluminum modified silica sol

作　　者：赵旭[1] 史凯 任轶轩 张红智 李宁 张伟 李晓峰[1] ZHAO Xu;SHI Kai;REN Yi-xuan;ZHANG Hong-zhi;LI Ning;ZHANG Wei;LI Xiao-feng(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学化学工程与技术学院,山西太原030024

出　　处：《现代化工》2022年第6期149-152,共4页Modern Chemical Industry

基　　金：国家科技型中小企业创新项目(14C26211400552)。

摘　　要：采用离子交换法制备铝改性硅溶胶,通过水热合成法制备合成了ZSM-5分子筛。利用XRD、SEM、FT-IR、N;吸附-脱附对其形貌、结构进行表征,并进行了乙苯脱乙基型二甲苯异构化反应催化性能评价。结果表明,该合成方法在140℃晶化48 h合成了高结晶度的ZSM-5分子筛。随着用碱量的提高,粒径逐渐减小,形貌从棱柱形向椭圆柱形转变,二甲苯异构活性达到23.95%,乙苯的转化率为56.38%,二甲苯损失率为0.65%。Aluminum modified silica sol is prepared via ion exchange method,and used to synthesize ZSM-5 molecular sieve via hydrothermal synthesis method at 140℃.The morphology and structure of the samples are characterized by means of XRD,SEM,FT-IR and N;adsorption-desorption.The catalytic performance of the samples is evaluated through the isomerization of ethylbenzene to xylene.Results show clearly that ZSM-5 molecular sieve with a high crystallinity has been synthesized at 140℃for 48 h,which has a regular appearance.With the increase of NaOH dosage,the particle size of ZSM-5 molecular sieve drops gradually,and the morphology changes from prismatic to elliptical cylindrical.Over the prepared ZSM-5 molecular sieve,the isomerization activity of xylene reaches 23.95%,the conversion rate of ethylbenzene is 56.38%,and the loss rate of xylene is 0.65%.

关 键 词：铝改性硅溶胶 ZSM-5分子筛 晶化温度 NAOH用量 

分 类 号：O643.3[理学—物理化学]