Key Laboratory of Energy Thermal Conversion and Control of Ministy of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

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Abstract: Selective catalytic reduction (SCR) of NOx with NH₃ is an effective control technique for limiting nitrogen oxide emissions nowadays. However, commercial catalyst in SCR of NOx, V2O5/TiO2, has a higher active temperature window about 300℃-380℃ and its main component vanadium will cause environmental pollution. Hence to develop new SCR denitration catalyst ,which can make high efficiency under low temperature and no poison, has been paid more and more attention. In this paper, Fe-based catalyst which worked with low temperature was studied and a three-dimensional model was developed to describe the activity of an SCR reactor. We present herein a transient kinetic analysis based on some mathematical models include of the flow field in fixed bed, occurrence of adsorption phenomena, interface diffusion and interface chemical reaction. The distribution of reactants (NO, NH3, O₂) concentrations and products (N₂, H₂O) concentrations are demonstrated as well as the distribution of temperature field and velocity. Since the distribution of these physical quantities are calculated with the simulation, we could optimize the reactor with adjusting the velocity, temperature, NH₃/NO ratio and O₂ concentration of reactant.

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