Development of a kinetic model to evaluate water storage during cold start on commercial Cu-SAPO SCR catalysts

Anand  Srinivasan, Cummins Inc.

The intrinsic mechanism of Water adsorption/ desorption over a Cu-exchanged SAPO-34 catalyst at low temperature was studied through series of water adsorption isotherms and reactor testing. Steady State isotherms and Transient TPD were designed to evaluate Water adsorption and desorption behavior over Cu SAPO-34 catalysts. Steady State Isotherms were used to understand Water storage interactions with respect to feed concentration and temperature. Transient TPD provides the time required to saturate the catalyst with water and rate of water removal.  The fundamentals of water adsorption and desorption characteristics were captured through modeling efforts. Meticulous verification and validation for the Water storage model was performed through series of Steady state Test Cell and transient Field data. Developed state of art model had good agreement predicting water storage and provides tuning strategy insight on cold start emissions.

Download poster presentation: