Synthesis and Catalytic Application of Zeolite-Based Hollow Materials

Abstract

Owing to the diffusion limitations of reactants and products in micropores, large zeolite crystals are not suitable for catalytic reactions involving macromolecules. Hierarchically porous zeolites with mesopores or macropores exhibit remarkably improved catalytic performance. Moreover, zeolite-based hollow structures are attracting a great deal of interest for their diverse applications in the areas of biochemistry, photonics, and catalysis. This review presents the fabrication and catalytic applications of the various zeolite-based hollow materials. The synthesis methods are classified to three categories, and the formation mechanisms were briefly summarized in this paper.

Postsynthetic High-Alumina Zeolite Crystal Engineering in Organic-Free Hyper-Alkaline Media

“…Upon exposure of large ZSM-5 crystals to NaOH solution, typically the interior of the crystals selectively dissolves, while the rim remains intact. , The interior likely is more siliceous than the rim explaining its preferential dissolution. This allows creation of hollow crystals serving as microcapsules, having a thin shell and large hollow core with potential for applications in many fields . Regular MFI-type zeolite microboxes (ca.…”

“…This allows creation of hollow crystals serving as microcapsules, having a thin shell and large hollow core with potential for applications in many fields. 25 Regular MFI-type zeolite microboxes (ca. 180 × 350 nm) with a hollow core and intact, thin crystalline shell with uniform thickness were obtained by mild treatment of MFI zeolite crystals with aqueous Na 2 CO 3 .…”