In this work

the kinetics of gas phase selective oxidation of toluene to benzaldehyde (BA) and benzoic acid (BAc) over V2O5/TiO2 catalyst was studied in a microchannel reactor. With the elimination of the mass and heat transfer limitations

the intrinsic characteristics of the reactions were well investigated in the microreactor. It was found that the activity of the catalyst decreased within the first three hours and after that no deactivation occurred during the experiments. The kinetic experiments were carried out in the steady state of the catalyst. A reaction network including five reactions was proposed

i.e.the consecutive oxidation of toluene to BA

BA to BAc

and the deep oxidation of all of the three to COx. It was assumed that the reactions were first order dependent on the organic compounds and the kinetic parameters were evaluated by the integral reactor model. The rate constants at a specific temperature

the pre-exponential factors and the activation energies of all the reaction steps were estimated. A simple and practicable kinetic model was built to characterize the process and to pre-estimate the rate of toluene oxidation and the product distribution within a rather wide reaction condition range.