Effect of phosphorus poisoning on the hydrothermal stability of Cu/CHA and Cu/LTA towards NH3-SCR

CuCHA and CuLTA were synthesized and examined for phosphorus poisoning, followed by hydrothermal aging. The CuLTA showed excellent hydrothermal stability, however, the CuCHA suffered dramatic structural damage after aging at 900 degrees C. The devastation of the aged CuCHA led to the disappearance of Cu active sites upon aging, especially ZCuOH sites. CuLTA retained most of the Cu active sites after aging. Phosphorus poisoning was found to reduce the hydrothermal stability of CuCHA, whereas CuLTA was not affected. Importantly, the treatment of hydrothermal aging was proved to regenerate phosphorus poisoned ZCuOH sites in CuLTA.

Automated summary

The study reveals that CuLTA exhibits excellent hydrothermal stability, while CuCHA is prone to structural damage at high temperatures. Phosphorus poisoning has a significant impact on CuCHA, but has little effect on CuLTA.