高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (4): 347.

• 研究论文 • 上一篇    下一篇

烃在HZSM-5沸石上的程序升温脱附

颠贻春, 秦关林, 武传昌, 顾良证   

  1. 南京大学化学系
  • 收稿日期:1983-12-23 出版日期:1985-04-24 发布日期:1985-04-24

A Study on the Temperature-Programmed Desorption of Hydrocarbons on HZSM-5 Zeolite

Yan Yichun, Qin Guanlin, Wu Chuanchang, Gu Liangzheng   

  1. Department of Chemistry, University of Nanjing, Nanjing
  • Received:1983-12-23 Online:1985-04-24 Published:1985-04-24

摘要: 本文研究了烃在HZSM-5沸石上的程序升温脱附(TPD).正己烷、环己烷和苯的TPD谱只有一个陡峰,对和间二甲苯的TPD谱均呈现出双峰.实验测得脱附活化能的次序为:正己烷>对二甲苯>苯>环己烷.水汽处理对正己烷的TPD影响不大;但对二甲苯的TPD影响较大.随着吸附量的增大,二甲苯逐渐占据孔道深处的强活性位置.

Abstract: The temperature-programmed desorption (TPD) of hydrocarbons on HZSM-5 zeolite has been investigated. Experimental data showed that only one main desorption peak appeared for n-hexane, cyclohexane and benzene, but for p- and m-xylene there were two desorption peaks. The order of the desorption activation energy obtained is: n-hexane >p-xylene>benzene>cyclohexane. The steam treatment of HZSM-5 at 600°C exerted little influence on TPDof n-hexane, but had a greater effect on TPD of xylene. At low adsorption amount, the molecules of xylene are mainly adsorbed on the less active sites near the entrance of pore channel of HZSM-5. Then they gradually move into the interior of pore channel and occupy the active sites with the increase of the adsorption amount.

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