Continuous Flow Reactor for Hydroxylation of Benzene to Phenol by Hydrogen Peroxide
- Received Date: 2012-04-02
- Continuous flow reactor, Hydroxylation, Activated carbon, Iron-carboxylate, Active phase, Activation energy
Abstract: The direct hydroxylation of benzene to phenol catalyzed by activated carbon-supported Fe (Fe/AC) in acetonitrile using H2O2 as the oxidant was studied in a continuous flow reactor. Results showed that the continuous operation could obtain high phenol yield of 28.1%, coupled with the turnover frequency of 3 h-1, and high selectivity of 98% under mild condition. The catalyst was characterized by N2 adsorption/desorption, Boehm titration, X-ray photoelectron spectra, and Fourier transform infrared spectroscopy. It was observed that iron may interact with the carboxyl group forming iron-carboxylate like species, which act as the active phase. The apparent activation energy obtained by fitting an Arrhenius model to the experimental data was 13.4 kJ/mol. The reaction order was calculated to be about 1, 0.2 for benzene and 0.7 for H2O2.
|Citation:||Li Zhang, Hui-hui Liu, Gui-ying Li, Chang-wei Hu. Continuous Flow Reactor for Hydroxylation of Benzene to Phenol by Hydrogen Peroxide[J]. Chinese Journal of Chemical Physics , 2012, 25(5): 585-591. doi: 10.1088/1674-0068/25/05/585-591|