Study On Carbon-Based Denitration Catalyst At Low Temperature

As environmental issues become increasingly prominent,NO_x emissions are seriously restricted,especially in low temperature flue gas.The traditional vanadium-based catalysts cannot meet the requirements,so the high activity denitration catalysts have become the focus of research at low temperature.The Fe-Mn denitration catalyst presents a better performance at low-temperature,and its carrier has significant effects on the activity of the catalysts,sulfur-resistance and water inhibition.In this study,The Fe-Mn catalysts are prepared by modified activated carbon,and the effect of carrier modification conditions and denitrification mechanism on its denitrification activity are explored.The effects of pretreatment for activated carbon on its activity are tested.It is found that the Fe-Mn/ACH-300 catalysts of activated carbon treated with nitric acid and temperature of 300°C has the higher activity,the denitrification efficiency is 90%at 200°C.The activated carbon after pretreatment has a certain oxygen-containing functional group and a large specific surface area which can keep the active component in a higher valence state and dispersibility,so as to leading to promote the denitration activity of the catalysts at low temperature.The catalyst prepared as follow condition:butyl titanate as the precursor and treating with in-situ hydrolysis method,10%?wt.?of TiO₂/AC and pretreatment tempreature of activated carbon of 800°C,has higher activity and NO conversion reaches 90%at 180°C.The denitration activity will increase with reaction temperature.Its activity is reduced is less than 2%after feeding SO₂ of 0.01%and H₂O of 10%in simulated flue gas.Through the characterization of the catalyst,it is revealed that low-temperature oxidbillity and more acid sites with catalysts are vital for high activity and its capacity of sulfur-resistance and water-inhibition at low temperature.Through the investigation of the catalytic mechanism,it reveals that the L-H and E-R mechanisms coexist in the denitration reaction at the low temperature,but the L-H mechanism is dominant.Figure 31;Table 8;Reference 88...