Effect of metal additives on the catalytic performance of MnO_x-CeO₂ supported on activated carbon honeycomb in NO removal at low temperature

The effect of FeO_x and SnO_x additives on the catalytic performance of MnO_x-CeO₂ supported on activated carbon honeycomb (MnO_x-CeO₂/ACH) in NO removal at low temperature was investigated. The results indicated that the addition of FeO_x can improve the distribution of manganese and cerium oxides on the ACH support and enhance the resistance to SO₂ poisoning in NO removal; the activity of FeO_x-modified MnO_x-CeO₂/ACH increases with the increasing reaction temperature from 80 ℃ to 200 ℃. Meanwhile, the MnO_x-CeO₂/ACH catalyst modified with SnO_x exhibits high NO removal activity and good resistance to SO₂ poisoning at relatively high temperatures; over SnO_x-modified MnO_x-CeO₂/ACH at 250 ℃, NO conversion decreases slightly from 98.6% in the absence of SO₂ to 87.8% in 700 min upon the introduction of SO₂ in the feed.