Dechlorination of chlorobenzene on vanadium-based catalysts for low-temperature SCR

Chlorobenzene (CB) inhibits SCR activity of V-based catalysts at low temperature, though the adsorption amount is small. NH3 adsorption increases due to the break in the C–Cl bond during CB oxidation. The dissociated Cl− ions provide extra Bronsted acid sites, leading to the formation of inactive NH4Cl. Ce and Mn improve dechlorination, forming more NH4Cl on the catalyst surface.