Abstract: Copper modified SSZ-13 molecular sieve (Cu-SSZ-13) is an efficient NH3 selective reduction catalyst for NOx removal, but the NOxremoval activity of Cu-SSZ-13 at high temperature (＞400 ℃) is poor. Compared with Cu-SSZ-13, Fe modified β molecular sieve catalyst (Fe-β) is cheaper and has better denitration performance at high temperature, so Fe-β has attracted much attention. The low temperature activity of Fe-β catalyst is improved after Cu doping, but cryogenic active temperature window and the maximum removal rate of SCR denitration catalyst still need to be improved. In this work, the composite catalyst was prepared by mechanical mixing of Cu-SSZ-13 and Fe-β to expand the temperature window of the catalyst. Cu-SSZ-13 was prepared by ion exchange of different concentrations of Cu(NO3)2 solution with commercial SSZ-13. The NH3-SCR test results show that Cu-SSZ-13 prepared by exchange of Cu(NO3)2 solution with the concentration of 0.04 mol/L has the best denitration activity, and the NOx removal rate is close to 100% at 200—400 ℃. The catalysts were characterized by powder X-ray diffraction (XRD), electron scanning microscope (SEM) and a series of other means. Reaction performance test results show that mechanical mixing of Cu-SSZ-13+Fe-β does not affect the low temperature activity window of NH3-SCR of Cu-SSZ-13, but the high temperature performance of catalyst is improved after mechanical mixing.
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2022, Vol. 36 
