Study on the Effect of Calcination Temperature on the Performance of Mn-Ce/TiO₂ Denitration Catalyst AITranslate

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Chinese Library Classification Number:TQ426.6[化学工程]

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The Mn-Ce/TiO₂ catalysts prepared by impregnation method were calcined at 300~500℃.XRD,BET,XPS,H₂-TPR,NH₃-TPD and denitration performance tests were conducted to investigate the effect of calcination temperature on the physical and chemical properties and denitration efficiency of Mn-Ce/TiO₂ denitration catalysts.The results show that the proper calcination temperature(400℃)is beneficial to increase the content of Mn⁴⁺,Ce³⁺and chemisorbed oxygen(O_α)of the catalyst,which can promote the denitration reaction.However,excessive calcination temperature(≥450℃)will lead to the increase of the particle size and the decrease of the dispersion of the active component MnO_x in the catalyst,and the decrease of the specific surface area of the catalyst.moreover,high calcination temperature also causes the decrease of the n(Mn⁴⁺)/n(Mn²⁺+Mn³⁺+Mn⁴⁺),n(Ce³⁺)/n(Ce³⁺+Ce⁴⁺),n(O_α)/n(O_α+O_β)and reducibility of the catalyst,which has an adverse effect on the denitration activity.The catalyst prepared at a calcination temperature of 400℃exhibits the best denitration activity within the flue gas temperature range of 120~270℃.