Figure 10.

(a) Comparative NH₃-SCR performance of Cu-SSZ-39 and Cu-SSZ-13 before and after hydrothermal aging. (b) Channel structures of AEI and CHA zeolites. Adapted with permission from ref. [98]. (c) NH₃-SCR performance of Cu-LTA-16–0.48 (red), Cu-LTA-11–0.48 (green) and Cu-LTA-23–0.5 (blue) before (left) and after (right) hydrothermal aging at 900°C. Adapted with permission from ref. [104]. (d) Copper species at different locations and transformation between the two copper species during HTA. Adapted with permission from ref. [105].