二次合成FeY分子筛的表面酸性

A STUDY ON SURFACE ACIDIC PROPERTIES OF SECONDARY SYNTHETIC FeY ZEOLITES

二次合成ＦｅＹ分子筛的表面酸性＊张爱民鲍书林须沁华＊＊（南京大学化学化工学院化学系，南京２１００９３）关键词ＦｅＹ分子筛，二次合成，表面酸性二次合成含杂原子沸石的过程中，Ｆｅ的引入显示出其特有的性能，例如在甲醇转化反应中能提高烯烃的选择性，在甲苯烷基...

The IR and NH 3 TPD techniques were used to study the surface acidic properties of different secondary synthetic FeY samples. The results showed that the conditions of secondary synthesis affected not only the Fe state but also the surface acidic properties on FeY. It was found that the B acid sites decreased obviously while the L acid sites increased along with dealumination and Fe amount inserted into the framework of zeolite. The intensity and amount of B acid sites depended on the pH value of the medium. The sample pretreated with (NH 4) 2SiF 6 aqueous solution possessed the smallest N B/ N L and contained more Fe(Ⅲ) in the framework than untreated one. While the sample treated in HNO 3 aqueous solution had the maximum B acid sites. The reason for these results was also discussed.