改性分子筛的表面酸性与苯烷基化反应活性的关系研究  

A STUDY ON THE RELATION BETWEEN SURFACE ACIDITY OF MODIFIED ZEOLITES AND ACTIVITY OF BENZENE ALKYLATION REACTION

作　　者：许艺 吴沛成 王志斌[2] 赵新刚 颜贻春 沈文霞[2] 

机构地区：[1]金陵石化烷基苯厂 [2]南京大学化学系

出　　处：《无机化学学报》1998年第3期298-302,共5页Chinese Journal of Inorganic Chemistry

摘　　要：用Ｃａ２＋、Ｓｒ２＋、Ｂａ２＋、Ｌａ３＋和ＮＨ＋４交换改性的Ｙ型沸石具有合适的表面酸性，可代替ＨＦ作为固体酸催化剂用于苯与长直链烯烃的烷基化反应。用正丁胺ＴＰＤ研究表明：在改性分子筛表面存在两种强度的酸位，其对应的脱附温度分别为３００和４５０℃，这两种强度的酸位峰面积在反应前后有不同程度的下降，强酸位下降得较多。吡啶吸附ＦＴ－ＩＲ的结果表明：催化剂表面Ｌ酸与Ｂ酸同时存在，苯与长直链烯烃烷基化反应的活性与中等强度的酸位有很好的对应关系，而与酸的类型关系不明显。Y type zeolite modified by Ca 2+ , Sr 2+ , Ba 2+ , La 3+ and NH + 4 ions had proper surface acidity for alkylation reaction It could replace HF as a solid acid catalyst used in alkylation reaction of benzene with long straight chain monoolefines It was proved by TPD spectra of fresh and used catalysts with n butylamine as probe moleccules that there were two kinds of acid with different strength on surface of zeolites The desorption temperatures of two kinds of acid were at 300℃ and 450℃ Two desorption peak areas of used catalyst were less than that of fresh catalyst The peak area at 450℃ decreased even much more than that at 300℃ The spectra of pyridine adsorption FT IR indicated that Lewis acid and Bronsted acid coexisted on surface of catalysts, there was a good correspondence relation between reaction activity of alkylation reaction and amounts of acid sites with middle strength, the reaction activity was independent to the type of surface acids

关 键 词：分子筛 沸石 苯 烷基化 固体酸 催化剂 

分 类 号：O643.36[理学—物理化学]