HZSM-5 的低温水热改性及其己烯芳构化性能  

Low-temperature hydrothermal modification of HZSM-5 and its aromatization performance for hexene

作　　者：魏永峰 李剑[1] 程子昂 杨丽娜[1] WEI Yong-feng;LI Jian;CHENG Zi-ang;YANG Li-na(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China;China Oilfield Services Limited,Tianjin 300450,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]中海油田服务股份有限公司,天津300450

出　　处：《石化技术与应用》2024年第3期165-170,共6页Petrochemical Technology & Application

基　　金：辽宁省高等学校杰出青年学者成长计划资助项目(项目编号:LJQ 2015062);辽宁省科学技术厅资助项目(项目编号:20170540585);辽宁省教育厅资助项目(项目编号:L 2015296;L 2016018)。

摘　　要：对HZSM-5在70,100和150℃下进行低温水热改性,分别制得催化剂T 70-HZ-5,T 100-HZ-5和T 150-HZ-5,利用X射线衍射仪、X射线荧光光谱仪、物理吸附仪、化学吸附分析仪和红外光谱仪等对上述催化剂进行表征,并对其己烯芳构化催化性能进行了评价。结果表明:低温水热改性保持了HZSM-5的完整晶相结构,提高了其硅铝比[n(Si)/n(Al)],B酸和L酸酸量比(B/L)及平均孔径;酸量的降低和孔径的增大有利于HZSM-5寿命的延长,B/L值的增大有利于选择性的提高;在反应温度405℃,反应压力0.2 MPa,质量空速2 h-1的条件下,T 100-HZ-5的催化寿命可达44 h,比改性前延长了36 h;当反应8 h时,HZSM-5的苯、甲苯和二甲苯混合物(BTX)选择性已迅速降到35%左右,而T 100-HZ-5的仍接近55%。In order to prepare catalysts of T 70-HZ-5,T 100-HZ-5,and T 150-HZ-5,low-temperature hydrothermal modification was carried out on HZSM-5 at 70,100 and 150℃,respectively.These catalysts were characterized by X-ray diffraction,X-ray fluorescence spectroscopy,physical adsorption,chemical adsorption,and infrared spectroscopy,and their catalytic performance for hexene aromatization was evaluated.The results showed that low-temperature hydrothermal modification maintained the complete crystal structure of HZSM-5 and increased its silicon aluminum mole ratio[n(Si)/n(Al)],the ratio of B acid to L acid(B/L),and the average pore size.The decrease in acidity and the increase in pore size were beneficial for prolonging the lifespan of HZSM-5,while the increase in B/L value was beneficial for improving selectivity.Under the conditions of reaction temperature of 405℃,reaction pressure of 0.2 MPa,and mass space velocity of 2 h-1,the catalytic lifespan of T 100-HZ-5 could reach 44 h,which was 36 h longer than the catalyst without modification.After 8 h of reaction,the selectivity of the mixture of benzene,toluene,and xylene(BTX)in HZSM-5 had rapidly decreased to about 35%,while T 100-HZ-5 was still close to 55%.

关 键 词：HZSM-5 低温水热改性 孔结构 烯烃 己烯 芳构化 催化剂寿命 选择性 

分 类 号：TQ241.1[化学工程—有机化工] TQ426