| 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 |
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| 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。 |
| 关键词: 改性分子筛 表面酸性 苯烷基化 |
| 基金项目: |
| Abstract: Y type zeolite modified by Ca2+, Sr2+, Ba2+, La3+ 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. |
| Keywords: modified zeolite surface acidity benzene alkylation |
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| 许艺,吴沛成,王志斌,赵新刚,颜贻春,沈文霞.改性分子筛的表面酸性与苯烷基化反应活性的关系研究[J].无机化学学报,1998,14(3):298-302. |
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