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Citation: Gao Zi, Hua Wei-Ming, Chen Jian-Min, Tang Yi. Characterization of Solid Superacidity by Pentane Isomerization Reaction[J]. Acta Physico-Chimica Sinica, ;1994, 10(10): 897-902. doi: 10.3866/PKU.WHXB19941007 shu

Characterization of Solid Superacidity by Pentane Isomerization Reaction

1.
Department of Chemistry,Fudan University,Shanghai 200433

Received Date: 20 July 1993
Available Online: 15 October 1994

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 od 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.
- Solid superacid,
- Zeolite,
- Pentane isomerization,
- Characterization of superacidity
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