A new method for characterization of solid superacidity: In situ C-13 MAS NMR study of butane isomerization on catalysts

作者：Ma ZN^*; Hu JC; Fan KN; Cao Y; He HY; Gao Z

来源：Acta Chimica Sinica, 2003, 61(9): 1352-1356.

• sulfated zirconia
• characterization
• butane isomerization
• superacidity
• C-13 MAS NMR spectroscopy

In situ C-13 MAS NMR study of C-13-labeled n-butane isomerization on sulfated zirconia (SZ) catalysts shows that the kinetics of n-butane isomerization on SZ catalyst at ambient temperature are well represented by Langmuir-Hinshelwood equation for a reversible first order surface reaction. The calculated isomerization reaction rate constant can be used as a measure of the solid superacidity of the catalysts. The new characterization method reveals that SZ catalysts synthesized from a combined one pot-alcohol thermal-supercritical fluid drying technique not only have high surface area and high sulfate content but their superacidity and isomerization activity are also much higher than those of the conventional SZ catalysts, which is very desirable from the practical point of view.

• 出版日期2003-9
• 单位复旦大学