Mn/beta and Mn/ZSM-5 for the low-temperature selective catalytic reduction of NO with ammonia: Effect of manganese precursors

Mn/beta-Ac showed excellent low-temperature NH3-SCR performance attributed to a combination of enriching the amorphous MnOx (MnO2 and Mn2O3) content, higher surface manganese concentration and labile oxygen groups, and a suitable number of weakly acidic centers.