Promoting effect of zirconium doping on Mn/ZSM-5 for the selective catalytic reduction of NO with NH3

► The zirconium addition greatly enhances dispersion of active phases on the support surface. ► Additive of zirconium provides oxygen atoms a relatively free pathway for approaching the manganese atoms. ► The Mn-Zr/ZSM-5 catalyst exhibits higher activity than the Mn/ZSM-5 for selective catalytic reduction of NO with NH3.