Effective Nitric Oxide Reduction Over Core‐Shell Cu−SSZ‐13@meso‐MOx Catalysts with Significant Catalytic Activity and Hydrothermal Stability

Abstract In this study, Cu−SSZ‐13 zeolites are successfully coated with mesoporous metal oxides (CeO 2 , Fe 2 O 3 , TiO 2 and SiO 2 ) and prepared as core‐shell Cu−SSZ‐13@meso‐MO x samples with hierarchical pore structure. Compared with Cu−SSZ‐13, the catalytic activity and hydrothermal stability of the Cu−SSZ‐13@meso‐MO x have been greatly improved. The promoting effect of meso‐MO x shell on the catalytic activity of Cu−SSZ‐13 is mainly attribute to the presence of both microporous and mesoporous structures, the formation of more active isolated Cu 2+ ions and more L‐acid sites, and the synergistic effect between Cu−SSZ‐13 and meso‐MO x interaction. Moreover, all the Cu−SSZ‐13@meso‐MO x catalysts maintain their activities to a greater extent after hydrothermal aging. The core‐shell structure may play a protective role and greatly improve the hydrothermal stability of Cu−SSZ‐13. More L‐acidic sites and more isolated Cu 2+ ions are preserved under the protection of mesoporous structure.