Nb-Mo-V-TiO2 low-temperature denitration catalyst and its performance in ammonium hydrogen sulfate decomposition
A series of Nb-doped V-Mo-Ti catalysts were prepared by impregnation method.The influ-ence of V2O5 load and Nb doping on the low-temperature denitration activity of the catalyst was investig-ated,and the decomposition performance of catalyst in ammonium hydrogen sulfate was explored.The cata-lysts were characterized by using XRD,N2 adsorption-desorption,H2-TPR,NH3-TPD and IR.The results show that Nb doping promotes the redox performance and improves the surface acidity of the cata-lyst,which makes the catalyst having more excellent denitrification performance at low temperature.Under the GHSV of 5 000 h-1,the denitrification efficiency of 1.5Nb-6V-3Mo-Ti catalyst reaches 100％at 180 ℃.At the same time,Nb doping improves the NO oxidation capacity of the catalyst and promotes the reaction of ammonia hydrogen sulfate and NO,thus improving the water-sulfur toxicity resistance of the catalyst at low temperature.
catalyst engineeringflue gas denitrification at low temperatureNb dopingammonium hydr-ogen sulfate decompositionV-Mo-Ti catalyst
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