物理化学学报 >> 1994, Vol. 10 >> Issue (10): 897-902.doi: 10.3866/PKU.WHXB19941007

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正戊烷异构化反应表征固体超强酸性

高滋, 华伟明, 陈建民, 唐颐   

  1. 复旦大学化学系，上海 200433
  • 收稿日期:1993-07-20 修回日期:1993-11-29 发布日期:1994-10-15
  • 通讯作者: 高滋

Characterization of Solid Superacidity by Pentane Isomerization Reaction

Gao Zi, Hua Wei-Ming, Chen Jian-Min, Tang Yi   

  1. Department of Chemistry,Fudan University,Shanghai 200433
  • Received:1993-07-20 Revised:1993-11-29 Published:1994-10-15
  • Contact: Gao Zi

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摘要： 详细研究了低温下固体酸催化剂上的正戊烷反应，发现在SO_42／MxOy型固体超强酸，HM和HZSM-5沸石表面上正戊烷反应以异构化为主，其反应动力学符合一级可逆反应规律，催化剂的酸强度与正戊烷异构化反应速率常数呈顺变关系，由此提出了一种适合于－16＜H0＜－12的固体酸强度测定方法，解决了该区域内有色样品或高温易分解样品在酸性测量上的难题．

关键词: 固体超强酸, 沸石, 正戊烷异构化反应, 超强酸性表征

Abstract: Pentane reactions on solid acids such as SO_42- /M.O., HM and HZSM-5 zeolites at low temperature were studied. In most cases the pentane isomerization selectivity is higher than 90%. The rate of pentane isomerization reaction follows the rate law of a first-order reversible reaction. As the acid strength of the catalysts is increased, the rate constant is increased concurrently. The pentane isomerization at low temperature is a good probe reaction for the characterization of the acidity of solid superacids, whose Ho values are between -12 and -16. The results obtained rank the catalysts correctly in order of increasing acidic strength as judged by Hammett indicators and other methods. The probe reaction provides an effective means to measure superacidity for colored and decomposable samples.

Key words: Solid superacid, Zeolite, Pentane isomerization, Characterization of superacidity