Kinetic modeling of NH3-SCR over a supported Cu zeolite catalyst using axial species distribution measurements

• A kinetic model for NH3 selective catalytic reduction over Cu-BEA was developed.
• Spatially resolved experimental data were used and simulated to fit the model.
• The model accounts for the non-monotonic formation of N2O with temperature.
• NO and NH3 oxidation were modeled.

In this study, a kinetic model is developed for NH3-SCR over a honeycomb-monolith-supported Cu-zeolites using intra-catalyst axial species distribution measurements. An ammonia TPD experiment, together with micro calorimetry data were used for tuning the ammonia adsorption and desorption properties. The spatial distribution for NO oxidation, NH3 oxidation and NH3 “Standard” SCR were modeled between 200 and 400 °C. Four-step protocol measurements were employed in order to validate the transient functions of the model. The resulting kinetic model provides good spatiotemporal simulation of the SCR reaction and component reactions throughout the monolith catalyst system.

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