New Insights into the Unique Operation of Small Pore Cu-Zeolite SCR Catalyst: Overlapping NH
Desorption and Oxidation Characteristics for Minimizing Undesired Products
An operational challenge associated with SCR catalysts is the NH3 slip control, particularly for commercial small pore Cu-zeolite formulations as a consequence of their significant ammonia storage capacity. The desorption of NH3 during increasing temperature transients is one example of this challenge. Ammonia slipping from SCR catalyst typically passes through a platinum based ammonia oxidation catalyst (AMOx), leading to the formation of the undesired byproducts NOx and N2O. We have discovered a distinctive characteristic, an overlapping NH3 desorption and oxidation, in a state-of-the-art Cu-zeolite SCR catalyst that can minimize NH3 slip during temperature transients encountered in real-world operation of a vehicle. In this work we show new insights, gained from NH3 temperature programmed desorption and oxidation experiments, into the Cu-zeolite catalyst functions responsible for the overlap of NH3 desorption and oxidation characteristics and the impact of hydrothermal treatment on these functions.
Citation: Kamasamudram, K., Kumar, A., Luo, J., Currier, N. et al., "New Insights into the Unique Operation of Small Pore Cu-Zeolite SCR Catalyst: Overlapping NH3 Desorption and Oxidation Characteristics for Minimizing Undesired Products," SAE Technical Paper 2014-01-1542, 2014, https://doi.org/10.4271/2014-01-1542. Download Citation
Krishna Kamasamudram, Ashok Kumar, Jinyong Luo, Neal Currier, Aleksey Yezerets, Thomas Watkins, Larry Allard
Cummins Inc., Oak Ridge National Laboratory
SAE 2014 World Congress & Exhibition
Advances in NOx Reduction Technology, 2014-SP-2348