Abstract
The coking behavior of the Fe-ZSM-5 zeolite catalyst during the oxidation of benzene with N2O to phenol was studied in an isothermal fixed-bed reactor using thermogravimetry. The effect of reaction time and temperature as well as the molar ratio of reactants on coking was investigated. Based on information obtained from experiments and a gas chromatography-mass spectrometry analysis of the coke on the catalyst, we suggest a mechanism for coke formation. Results show that the formed coke mainly comes from the further oxidation of phenol, revealing that sequential deactivation occurs in the main reaction. Based on the suggested mechanism, a kinetic model for coke formation that describes coke deposition over the Fe-ZSM-5 zeolite catalyst was developed. A statistical test and a residual distribution analysis show that the kinetic model established here is in good agreement with the experimental data and is acceptable and reliable.
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