NOx reduction performance of fresh and aged Fe-zeolites prepared by CVD: Effects of zeolite structure and Si/Al2 ratio

▶ SCR activity decreased when Si/Al2 ratio increased. ▶ SCR activity order of fresh Fe/zeolites was BEA > MFI > FER > LTL > MOR. ▶ SCR activity of fresh states was correlated with HT peak in NO2-TPD and NO oxidation. ▶ SCR order of 700 °C hydrothermally aged samples was MFI > BEA > FER > LTL > MOR. ▶ Deterioration rate of NOx conversion was correlated with zeolite crystal size.