On the acidity of liquid and solid acid catalysts. Part 2. A thermodynamic and kinetic study for acid-catalysed nitrations |
| |
| Authors: | Nunziata Clara Marziano Claudio Tortato Lucio Ronchin Federica Martini Claudia Bianchi |
| |
| Affiliation: | (1) INFM and Chemistry Department, University of Venice, Dorso Duro 2137, 30123 Venice, Italy;(2) Department of Physical Chemistry and Electrochemistry, University of Milan, Golgi 19, 20133 Milan, Italy |
| |
| Abstract: | Solid acids prepared by adding sulfuric acid on silica gel have been used as catalysts in the nitration of nitrobenzenes and
their properties have been tested by kinetic studies at 25°C. Nitration rates in concentrated aqueous solutions of sulfuric
acid were also analysed and the catalytic efficiencies of sulfuric acid in liquid and solid phase were compared by using kinetic
data of analogous compounds. The results show that the solid acid samples exhibit nitrating properties very similar to those
observed in concentrated aqueous solutions of sulfuric acid (range of 90 wt%). The relationship between nitration rates and
effective concentration of electrophilic species NO
2
+
], determined by studying the protonation–dehydration equilibrium of nitric acid in strong acids (HNO3 + H+ ⇌ H2O + NO
2
+
), was tested to better understand the acidity properties of medium.
This revised version was published online in November 2006 with corrections to the Cover Date. |
| |
| Keywords: | nitration sulfuric acid solid acid catalysts |
| 本文献已被 SpringerLink 等数据库收录！ |
|
