改性Y分子筛对苯-丙烯烷基化反应中副产物正丙苯的影响  

THE STUDY ON LIQUID RECATION OF PROPYLENE WITH BENZENE OVER MODIFIED Y ZEOLITES

作　　者：曹玉华[1] 杨一青[1] 陆丽元[1] 周斌[1] 方永成[1] 

机构地区：[1]上海石油化工研究院,上海201208

出　　处：《石油学报（石油加工）》2001年第2期79-84,共6页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：用 FT-IR和 MAS NMR方法探索了不同改性方法对 Y分子筛表面酸性质的影响。研究结果表明 ,改性后分子筛骨架发生脱铝 ,酸性 OH基团的 FT-IR特征峰波数向低波数位移 ,骨架 n( Si) /n ( Al)增大 ,表面B酸中心减弱 ,L酸中心增强 ,B酸中心强度得到加强。催化剂评价结果表明 ,产物中副产物正丙苯的生成与分子筛表面 B酸中心强度直接有关 ,其含量正比于 Y分子筛表面The influence of the surface acidity of modified Y zeolites has been investigated by using FTIR and MAS NMR.The IR wave number shift of acied OH group toward lower frequencies,the reduction of B acid sites,the increase of framework n (Si)/ n (Al)ratio,L acid site and the strength of B acid sites of modified Y zeolites indicated the conversion of framework alumina to non-framework alumina.The by-product n -propylbenzene associated directly with the strength of B acid sites of Y zeolites.The amount of n -propylbenzene was in proportion to the strength of B acid sites.

关 键 词：正丙苯 分子筛 改性 酸性质 丙烯 苯 烷基化反应 

分 类 号：TQ241.24[化学工程—有机化工] TQ426.94