Technical Paper
Influence of Co-Cations on the Performance and Hydrothermal Stability of Cu/SSZ-13 Catalysts
2020-04-14
2020-01-1317
This research focuses on co-cations modified Cu-zeolite catalyst CuCe/SSZ-13. The NOx conversion and hydrothermal stability of fresh and aged Cu/SSZ-13 and CuCe/SSZ-13 were evaluated to conclude the impact of Ce on the zeolite stability and mechanism of NH3-SCR reaction. For fresh samples, CuCe/SSZ-13 exhibited more than 80% efficiency at 225 °C to 600 °C, and showed higher NOx conversion below 225 °C and above 450 °C than Cu/SSZ-13. For aged catalysts, CuCe/SSZ-13 exhibited higher efficiency at all test temperatures than Cu/SSZ-13, and exhibited over 80% conversion at 225 °C to 350 °C, whereas, that was only 250 °C to 300 °C over fresh Cu/SSZ-13 sample. Furthermore, the effect of co-cation Ce on the phase structure changes, acid sites, redox capacity, transformation of various Cu species, and framework stability of the samples were evaluated by several techniques, such as TPD, TPO, TPR, BET, and XRD.
