Study On The Preparation And Properties Of Manganese Base SCR Catalyst

The SCR de-NOxtechnology is easy for low temperature SCR technology to match theexisting boiler system without re-heating energy consumption and efficient, thereforedeveloping the low-temperature SCR catalyst becomes to be a hot research field of SCRtechnology.The preparation parameters of the low temperature SCR catalyst based on the manganesewere optimized by the orthogonal experimental method and the comprehensive balancemethod. The better parameters of the catalyst preparation were determined by the method ofthe comprehensive balance. The optimal preparation parameters of the catalyst listed below.The calcination temperature of the carrier was500℃. The roasting time of the carrier was5h.The component ratio of the carrier was0.4. The load of the catalyst’s active ingredients wasten percent. The catalyst’s activation temperature was550℃. And the catalyst’s activationtime was5h.The performance of Mn10%-Ti_0.6Ce_0.4O₂catalyst was studied in this experiment.Experimental results show that the denitration efficiency of Mn10%-Ti_0.6Ce_0.4O₂catalyst wasover sixty point in100℃under the reaction conditions of this experiment.The impact of thedenitration efficiency of the catalyst and under the combined action of water vapor and SO2was12%, in other word the catalyst at a low temperature condition having a preferably waterand SO2resistant.Transition metal Fe, Cu was added to improve the denitration efficiency ofMn10%-Ti_0.6Ce_0.4O₂catalyst. Simultaneously the improvement in the denitration efficiency ofthe catalyst with Fe and Cu are superior to the catalyst only with Fe or Cu. When the massfraction ratio of Fe and Cu was1:1, the prepared compound SCR manganese-based catalystFe2.5%-Cu2.5%/Mn10%-Ti_0.6Ce_0.4O₂catalyst had a best catalytic performance at thelow-temperature, which was much better than the denitration catalyst of Mn10%-Ti_0.6Ce_0.4O₂.At88℃the denitrification efficiency of Fe2.5%-Cu2.5%/Mn10%-Ti_0.6Ce_0.4O₂catalyst was more than50%, and at100°C the denitrification efficiency was close to70%. At150℃thedenitration efficiency was83%, and Fe2.5%-Cu2.5%/Mn10%-Ti_0.6Ce_0.4O₂catalyst had a goodlow-temperature activity and better anti-poisoning performance.