Abstract
A series of catalysts of iron–manganese oxide supported on mesoporous silica (MPS) with different Mn/Fe ratio were studied for low-temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. Effects of amounts of iron–manganese oxide and calcination temperatures on NO conversion were also investigated. It was found that the Mn–Fe/MPS with Mn/Fe=1 at the calcination temperature of 673K showed the highest activity. The results showed that this catalyst yielded 99.1% NO conversion at 433K at a space velocity of 20,000h−1. H2O has no adverse impact on the activity when the SCR reaction temperature is above 413K. In addition, the SCR activity was suppressed gradually in the presence of SO2 and H2O, while such effect was reversible after heating treatment.
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