Roles of C3H6 in NH3 Generation and NOx Reduction over a Cu-chabazite SCR Catalyst under Lean/Rich Cycling Conditions

Propylene can be used to reduce NO_x over Cu-chabazite SCR catalysts under lean/rich cycling conditions involving NH₃ as an intermediate reductant. Understanding the roles of C₃H₆ in generating NH₃ in situ and inhibiting NH₃ utilization can facilitate the development of optimized coupled LNT-SCR catalysts and operational strategies.