New insights into sulfur poisoning on a vanadia SCR catalyst under simulated diesel engine operating conditions

- Investigates effect of SO2 under simulated diesel engine operating conditions.
- The presence of 50 ppmv SO2 in 473-573 K slightly increases NOx conversion.
- Low temperature event initiates and leads to progressive VSCR deactivation.
- Formation of ammonium sulfate species results from low temperature events with the presence of SO2 under SCR condtion.