Kinetic modeling of H2-assisted C3H6 selective catalytic reduction of NO over silver alumina catalyst

• A global kinetic model for H2-assisted C3H6-SCR over monolithic Ag-Al2O3 catalyst.
• The model describes wide range of feed and reaction conditions with/without H2.
• Dual role of H2 to remove inhibiting nitrates and to form new active Ag sites.
• Model accounts for influence of all relevant mass transfer resistances.

A global kinetic model was developed for C3H6-SCR consisting of NO oxidation, C3H6 oxidation and C3H6-SCR reactions with and without H2 over Ag-Al2O3. The model is based on a dual role of H2 to remove inhibiting nitrates from the active sites as well as to modify/form new active Ag sites. For model development, a range of temperature programmed reaction (TPR) and transient feed experimental conditions were used. The proposed model was eventually also validated with additional transient experimental data. The kinetic model proposed in this study predicts the experimental data well for a wide-range of feed conditions. Evaluation of mass transfer resistance in the washcoat indicated that during H2-assisted C3H6-SCR, mild internal mass transfer resistance for NO was predicted to be important already at 250 °C.

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