Preparation of SSZ-13 zeolites and their NH3-selective catalytic reduction activity

The effects of the Si/Al ratio in raw material and the crystallization process on the crystallinity and morphology of SSZ-13 zeolites synthesized by microwave, dynamic, and static hydrothermal methods were studied. After the ion exchange, the Cu-SSZ-13 catalysts were applied to the selective catalytic reduction (SCR) of NOx with NH3 and characterized by XRD, SEM, BET, H-2-TPR, and NH3/NO-TPD. Microwave and dynamic hydrothermal methods can shorten the crystallization time, and the samples synthesized by these two methods showed excellent particle dispersion and a regular morphology. Furthermore, the samples prepared by microwave and dynamic hydrothermal methods have better ion exchange capacity and adsorption of NH3/NO, and the resulting Cu-SSZ-13 catalysts displayed excellent catalytic activity and hydrothermal stability.