On the origin of the optimum loading of Ag on Al2O3 in the C3H6-SCR of NOx

- The interest in the NOx-TPD method for the characterization of oxides is confirmed.
- Pseudo monolayer coverage of Al2O3 by Ag2O occurred at an Ag loading of about 2 wt%.
- C3H6-SCR performances can be correlated to the Ag surface density.
- NOx-TPD is used to explain the optimum loading of Ag on Al2O3 in the HC-SCR of NOx.
- The concept of Ag surface density allowed rationalizing some of the earlier results.