ZSM-5/SAPO-34复合分子筛的制备与甲醇芳构化性能研究  

Study on preparation of hierarchical porous ZSM-5/SAPO-34 composite molecular sieve and its catalytic performance for methanol aromatization

作　　者：刘占宇[1] 张玲[2] 魏民[1] 王坤[3] 王海彦[1] 

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001 [2]辽宁石油化工大学顺华能源学院,辽宁抚顺113001 [3]中国石油抚顺石化公司烯烃厂,辽宁抚顺113001

出　　处：《应用化工》2014年第11期1977-1980,共4页Applied Chemical Industry

基　　金：辽宁省自然科学基金(201202126)

摘　　要：采用Na OH溶液处理法制备了介孔ZSM-5分子筛。采用包埋法合成了ZSM-5/SAPO-34复合介孔分子筛,并采用X射线衍射图谱(XRD)、电子扫描电镜(SEM)、氮吸附进行分析,在固定床反应器中进行了甲醇芳构化反应。研究结果表明,ZSM-5/SAPO-34复合分子筛孔径呈微孔和介孔多级孔分布,孔径和孔容均高于ZSM-5分子筛。当ZSM-5与SAPO-34分子筛的质量比为1∶2时,ZSM-5/SAPO-34复合分子筛具有较好的芳构化活性。在反应温度为475℃、反应压力0.5 MPa、空速(LHSV)1.2 h-1条件下,BTX(苯、甲苯和二甲苯)的收率可达30.8%。ZSM-5 Mesoporous molecular sieve were prepared by NaOH solution to alkali treatment of ZSM-5 molecular sieve,ZSM-5/SAPO-34 mesoporous composite molecular sieves were prepared by embedding method. The samples were characterized by X-ray diffraction（ XRD）,scanning electron microscope（ SEM）and N2 sorption. Methanol aromatization reaction were accomplished in fixed bed reactor. The results showed that the pore diameter of ZSM-5/SAPO-34 is a multistage aperture of microporous and mesoporous,the pore size and pore volume is higher than the ZSM-5 molecular sieve. When ZSM-5 and SAPO-34 molecular sieve ’s mass ratio is 1：2 ,the ZSM-5/SAPO-34 mesoporous composite molecular sieves has better aromatization activity. In reaction temperature 475 ℃,pressure is 0. 5 MPa,air speed （LHSV）1. 2 h-1,under the condition of BTX（benzene,toluene and xylene）and the yield can reach 30 . 8%.

关 键 词：SAPO-34分子筛 ZSM-5分子筛 复合分子筛 甲醇 芳构化 

分 类 号：TQ241.1[化学工程—有机化工]