Fig. 4: NH3-SCR performances and characterization of Fe–Mn/Al-SBA-15 and Fe–Mn/SBA-15 catalysts.

a NOx conversion. b N2 selectivity. c XPS spectra. d XRD patterns. e NH3-TPD curves.

a NOx conversion. b N2 selectivity. c XPS spectra. d XRD patterns. e NH3-TPD curves.