化学学报 ›› 1994, Vol. 52 ›› Issue (1): 36-41. 上一篇    下一篇

研究论文

XO~4^2-/ZrO~2固体超强酸催化剂上的正构烷烃反应

高滋;陈建民;唐颐   

  1. 复旦大学化学系
  • 发布日期:1994-01-15

Linear alkane reactions on SO~4^2-/ZrO~2 solid superacid catalysts

GAO ZI;CHEN JIANMIN;TANG YI   

  • Published:1994-01-15

本文考察了SO~4^2-/ZrO~2固体超强酸催化剂上正构烷烃的反应及影响催化剂活性和选择性和各种因素。结果表明: 烷烃的骨架异构化和裂解反应在催化剂上同时进行, 烷烃的碳原子数增加, 催化剂活性提高, 裂解反应比例增加, 降低反应温度有利于骨架异构化反应; 同时催化剂的反应性能与含水量关系十分密切, 完全脱水的催化剂活性很低, 少量水的存在有利于提高催化活性, 过量的水又可使催化剂失活。根据催化剂的热重分析、红外光谱和反应数据, 提出低温时正戊烷反应主要在催化剂表面B酸位上进行, 随着反应温度升高和烷烃碳原子数增加, 催化剂表面的L酸位才显示一定的活性。

关键词: 红外分光光度法, 催化剂, 硫酸, 裂解, 氧化锆, 正构烷烃, 异构化, 热重分析, 中国石油化学工业总公司基金

The reactions of linear alkanes on SO~4^2-/ZrO~2 solid superacid catalysts were studied. The skeletal isomerization and cracking of linear alkanes proceed simultansously on SO~4^2-/ZrO~2 catalysts. Experimental results suggest that the longer the alkyl chain, the higher the activity and the less the isomerization selectivity. The catalytic performance of SO~4^2-/ZrO~2 sample is very low. Small amount of water in the sample is necessary for high activity, but excess water will poison the catalyst. Correlating the reaction date with thermogravimetric and IR spectroscopic results, it can be proposed that for the n-pentane at lower reaction temperature the reactions with longer alkyl chains and at higher reaction temperature the lewis acid sites on the catalyst surface display some reactivities.

Key words: INFRARED SPECTROPHOTOMETRY, CATALYST, SULFURIC ACID, PYROLYSIS, ZIRCONIUM OXIDE, NORMAL PARAFFIN, ISOMERIZATION, THERMOGRAVIMETRY

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