Propene-SCR of NO over electrically heating anodic alumina supported silver catalyst

An anodic alumina supported silver catalyst (1.7 Ag/Al₂O₃) was synthesized to investigate the selective catalytic reduction (SCR) of NO under an electrically heating pattern. It was found that less than 1 min was required to heat the catalyst from room temperature to 450°C. Comparing with a common furnace heating pattern, similar de-NO_x activity was achieved. According to the electrically heating tests, the NOx conversion of 1.7 Ag/Al₂O₃ remained above 80% for 15 h at 450°C (F/W=65000 mL/(g · h)), which proved that it was commendable to apply this type of catalyst to C₃H₆-SCR of NO. Additionally, the promotional effect of hydrogen additive is also discussed under the electrically heating pattern. In the presence of 2000 ppm of hydrogen, the 1.7 Ag/Al₂O₃ reached 80% NO_x conversion within a few seconds at 300°C, while the activity was very low at 300°C without hydrogen; such a high conversion was maintained for 15 h.