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| Mechanistic Study on the Effects of Ce Modification On Cu/SSZ-13 Catalysts Against Potassium Poisoning |
| DOI：10.13949/j.cnki.nrjgc.2023.05.011 |
| Key Words:Ce modification Cu/SSZ-13 catalyst potassium poisoning selective catalytic reduction（SCR） NOx |
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| Abstract:Ce–Cu/SSZ-13， Ce–K–Cu/SSZ-13 and K–Cu/SSZ-13 catalysts were prepared with equal volume impregnation method. The NH3 selective catalytic reduction（NH3-SCR） performance of the Ce–Cu/SSZ-13， K–Cu/SSZ-13 and Ce–K–Cu/SSZ-13 catalysts were investigated by simulated gas experimental platform， and the effects of the introduction of alkali metal potassium on the physical and chemical properties of the Ce–Cu/SSZ-13 catalysts were explored by X-ray diffraction（XRD）， specific surface area（BET）， X-ray photoelectron spectroscopy（XPS） and NH3–programmed temperature desorption（NH3-TPD） characterizations. The results show that the introduction of alkali metal potassium leads to a decrease in the activity of Cu/SSZ-13 catalyst and produces potassium poisoning deactivation. Compared with the K–Cu/SSZ-13 catalyst， the NOx conversion of the K–Ce–Cu/SSZ-13 catalyst is increased and the T80 temperature window is widened up to 220~580 ℃， the number of Cu2+ species increases at acidic sites and active centers on the catalyst surface， which indicates that Ce has the resistance of potassium poisoning deactivation. The results show that the modification of Cu/SSZ-13 catalyst by Ce can improve the performance of NH3-SCR， and has a certain resistance effect on the poisoning and deactivation of catalysts. |
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