Thermal Transient Effects on the Performance of Catalysts for SCR of NOx

Jonathan  Male, Pacific Northwest National Laboratory

In the development of catalysts for urea-selective catalytic reduction (SCR) of NOx there is a need to accelerate the transition from testing of powders under steady state conditions to transient test regimes.  Pacific Northwest National Laboratory (PNNL) has developed a transient thermal cycle micro-reactor that emulates the thermal changes of an exhaust stream in the Federal Test Procedure (FTP) heavy-duty transient cycle used for emission testing of heavy-duty on-road diesel engines.  Results from the testing of an industry supplied zeolite based urea-SCR catalyst will be discussed.

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