Development of Cu SCR Model using CLEERS Transient SCR Reactor Protocol

Maruthi  Devarakonda, Pacific Northwest National Laboratory

Because of the high NOx reduction efficiency over a wide range of temperatures and lower system cost, the selective catalytic reduction (SCR) of NOx is currently being used for meeting the 2010 NOx emission standards in North America. The latest Cu-zeolite catalyst has been reported to show excellent efficiency under various operation conditions and high thermal durability. However, further improvement in NOx reduction performance will be required to meet the future emission standards and to reduce the system cost. Thus, in order to help improve the catalyst technologies and optimize the system performance, an SCR model was developed using data collected over a production Cu SCR catalyst.

The CLEERS transient SCR reactor protocol, which had been developed and discussed at the 2010 CLEERS workshop, was used to generate well-defined data sets, which were then used to estimate kinetic parameters and model validation. Based on the laboratory experiments, a one-dimensional detailed kinetic model was developed in Matlab/Simulink to quantitatively describe the effects of ammonia storage and NO/NO2 ratios on SCR reaction pathways.

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