Strategies to control zeolite particle morphology

Methods to synthesize zeolites with different crystal habits and assemble zeolite crystals into specific structures are reviewed for the rational design of zeolite particle morphologies.

Synthesis of hierarchical MFI zeolites with a micro–macroporous core@mesoporous shell structure

Core–shell structured ZSM-5 zeolites were synthesized by using a bifunctional surfactant containing alkene group in the hydrophobic tail.

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core-Shell Materials

The term "engineered zeolitic materials" refers to a class of materials with a rationally designed pore system and active-sites distribution. They are primarily made of crystalline microporous zeolites as the main building blocks, which can be accompanied by other secondary components to form composite materials. These materials are of potential importance in many industrial fields like catalysis or selective adsorption. Herein, critical aspects related to the synthesis and modification of such materials are discussed. The first section provides a short introduction on classical zeolite structures and properties, and their conventional synthesis methods. Then, the motivating rationale behind the growing demand for structural alteration of these zeolitic materials is discussed, with an emphasis on the ongoing struggles regarding mass-transfer issues. The state-of-the-art techniques that are currently available for overcoming these hurdles are reviewed. Following this, the focus is set on core-shell composites as one of the promising pathways toward the creation of a new generation of highly versatile and efficient engineered zeolitic substances. The synthesis approaches developed thus far to make zeolitic core-shell materials and their analogues, yolk-shell, and hollow materials, are also examined and summarized. Finally, the last section concisely reviews the performance of novel core-shell, yolk-shell, and hollow zeolitic materials for some important industrial applications.

Graphene oxide-assisted synthesis of core–shell structured ZSM-5 zeolites and their catalyst texture effect on the catalytic performance in the acid-catalyzed o-methylation of cyclohexanone with methanol

Tailoring the crystallization process to realize targeted material texture/porosity is a major challenge in zeolite synthesis, which facilitates the practical application of zeolites.

Synthesis of microporous/mesoporous core–shell materials with crystalline zeolitic shell and supported metal oxide silica core

Engineered silica@zeolite core–shell composites, possessing a hierarchical porosity in a shape selective manner, were synthesised by deposition of silicalite-1 nanocrystals over various mesoporous silica spheres, in either pure form or loaded with metal guest species.