MCM-22分子筛用于二甲苯异构化的性能研究  

XYLENE ISOMERIZATION OVER ZEOLITE MCM-22

作　　者：周末 盖月庭 岳欣 康承琳 Zhou Mo;Gai Yueting;Yue Xin;Kang Chenglin(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油炼制与化工》2023年第11期47-52,共6页Petroleum Processing and Petrochemicals

摘　　要：以六亚甲基亚胺(HMI)作为模板剂,采用动态水热合成法合成不同硅铝比的MCM-22分子筛;以MCM-22分子筛作为酸性组分,负载铂制备转化型二甲苯异构化双功能催化剂(Pt MCM-22)。通过X射线衍射(XRD)、比表面积测试法(BET)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)等测试手段对分子筛样品的形貌和性质进行表征。使用微型活塞流反应器对催化剂的反应性能进行评价,并与采用丝光沸石(MOR)分子筛制备的催化剂进行性能对比。结果表明,MCM-22分子筛用于二甲苯异构化反应具备优秀的异构化活性和反应选择性,且分子筛酸性质会影响其反应性能。MCM-22 molecular sieve with different Si Al ratios was synthesized by dynamic hydrothermal synthesis method using hexamethyleneimine(HMI)as template,and MCM-22 molecular sieve as acidic component,a bifunctional transformation type catalyst(Pt MCM-22)for the isomerization of xylene was prepared by supported platinum.The morphologies and properties of the molecular sieve samples were characterized by X-ray diffraction(XRD),specific surface area testing(BET),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and other methods.The performance of the catalyst was evaluated by using a micro-piston flow reactor and compared with that of the catalyst prepared with MOR zeolite.The mechanism of the catalytic isomerization of xylene was further studied,and the evaluation results were explained.The results showed that MCM-22 molecular sieve had excellent isomerization activity and selectivity for xylene isomerization,and the acidity of the molecular sieve would affect its reaction performance.

关 键 词：二甲苯异构化 MCM-22 离子 酸性 

分 类 号：TQ426[化学工程] TQ241.13