Abstract
The nano Beta zeolites were successfully prepared by secondary hydrothermal synthesis, which exhibited excellent and stable catalytic performance in the Friedel-Crafts acylation of anisole/thioanisole at low temperature. Effects of reaction temperature and reactants molar ratio on the catalytic performance of the nano Beta zeolites were systematically investigated in this work. Acetic anhydride conversion and 4-methoxypropiophenone selectivity were 77.34% and 100% at 313 K, both acetic anhydride conversion and p-(methylthio) acetophenone selectivity were 100% at 393 K. Simple calcination could recover catalytic performance of the nano Beta zeolites. Furthermore, Kinetic studies revealed that the catalytic reaction followed Langmuir-Hinshelwood mechanism, and activation energy of the Friedel-Crafts acylation of anisole and acetic anhydride with the nano Beta zeolites was only 41.52 kJ/mol.
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