论文部分内容阅读
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。
The Y zeolite exchanged with Ca2 +, Sr2 +, Ba2 +, La3 + and NH + 4 has suitable surface acidity, and can replace HF as a solid acid catalyst for the alkylation of benzene with long linear olefins. The study of TPD with n-butylamine showed that there are two kinds of acid sites on the surface of the modified molecular sieve, the corresponding desorption temperatures are 300 and 450 ℃, respectively. The peak areas of acid sites of these two kinds of intensity are different before and after the reaction Decline, strong acid drops more. The results of pyridine adsorption FT-IR show that the L acid and B acid exist on the surface of the catalyst. The alkylation reaction between benzene and long linear alkenes has a good correspondence with the moderate acidity, but the acid type Not obvious.