Cocrystallized zeolite interface boosting the hydrothermal stability of Cu-CHA/OFF-ERI catalysts

Open AccessCCS ChemistryRESEARCH ARTICLES29 Jul 2024Cocrystallized zeolite interface boosting the hydrothermal stability of Cu-CHA/OFF-ERI catalysts Jinfeng Han, Junyan Li, Yang Bai, Yingzhen Wei, Dan Li, Wenfu Yan and Jihong Yu Jinfeng Han , Junyan Li , Yang Bai , Yingzhen Wei , Dan Li , Wenfu Yan and Jihong Yu Cite this: CCS Chemistry. 2024;0:1–24https://doi.org/10.31635/ccschem.024.202404558 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareFacebookTwitterLinked InEmail Cu-based Al-rich zeolite catalysts (e.g., Cu-SSZ-13, CHA) exhibit excellent catalytic activity in the ammonia selective catalytic reduction of nitrogen oxides (NH3-SCR), particularly at low temperature, but their application is hindered by inferior hydrothermal stability. In this study, CHA/OFF-ERI zeolites with cocrystallized interfaces between small CHA zeolite crystals and OFF-ERI intergrowth zeolite rods were synthesized, which demonstrated superior hydrothermal stability compared to Cu-SSZ-13, Cu- OFF-ERI, and a physical mixture of Cu-SSZ-13 and Cu- OFF-ERI (denoted as Cu-Mixture). Studies on the evolution of the crystallinity and Brønsted acid sites of Cu- CHA/OFF-ERI, Cu-SSZ-13, Cu- OFF-ERI, and Cu-Mixture before and after hydrothermal ageing suggested that the cocrystallized interfaces accounted for the enhanced hydrothermal stability of Cu- CHA/OFF-ERI zeolite. During hydrothermal ageing, the cocrystallized interfaces locked the Al(OH)3 species detached from the zeolitic framework within the zeolitic micropores. After hydrothermal ageing, the detached Al(OH)3 species were reincorporated into the defects as the temperature decreased, thereby inhibiting dealumination and improving the hydrothermal stability of Cu- CHA/OFF-ERI zeolite. This work unravels the role of cocrystallized interfaces in boosting the hydrothermal stability of Cu-based cocrystallized zeolites, providing valuable guidance for designing catalysts with excellent NH3-SCR performance taking advantage of the cocrystallized zeolite interfaces. Download figure Download PowerPoint Previous articleNext article FiguresReferencesRelatedDetails Issue AssignmentNot Yet AssignedSupporting Information Copyright & Permissions© 2024 Chinese Chemical Society Downloaded 38 times PDF downloadLoading ...