Two-Dimensional Zeolites: Current Status and Perspectives

Zeolites are well-known as valuable crystalline solids with framework structures containing discrete micropores of molecular dimensions that accommodate exchangeable extraframework cation sites.1−3 In terms of host−guest interactions, zeolites can be viewed as host frameworks with structurally intact and immutable three-dimensional (3D) structures. They show exceptional catalytic and sorption characteristics together with very desirable environmental qualities.4−7 Zeolites are widely used in commercial applications as catalysts for hydrocarbon conversions in petroleum and chemical industries, 8−10 as sorbents for small-molecule separation processes, and as ion exchangers in detergents.11