Zeolite nanosheets for catalysis

Zeolites with well-defined micropores have been widely used as heterogeneous catalysts in the fields of petroleum refining, fine chemicals, and environment protection. However, the sole micropores in the zeolite structures usually impose diffusion constraints, which would greatly influence their catalytic performances. Therefore, it is highly desirable to shorten the diffusion pathway of zeolites and thus eliminate the diffusion constraints. One of the efficient methods is to synthesize zeolite nanosheets, which has become a hot topic in the past decades. In this tutorial review, the recent progresses in the synthesis of zeolite nanosheets and their relevant catalysis are briefly discussed. Various strategies for the synthesis of zeolite nanosheets are summarized including delamination, templated crystallization, additive-assisted synthesis, seed-directed synthesis, and gaseous expansion synthesis. In addition, the catalytic reactions of zeolite nanosheets with acidic and metal sites are also outlined. This tutorial review should be significant for the design and preparation of highly efficient zeolite catalysts.

Preparation of hierarchical catalysts with the simultaneous generation of microporous zeolite using a template and large mesoporous silica by gel skeletal reinforcement and their reactivity in the catalytic cracking of n-dodecane

Zeolite-containing hierarchical mesoporous catalysts prepared using gel skeletal reinforcement exhibited the superior activity and selectivity in n-dodecane catalytic cracking.

Direct synthesis of self-assembled ZSM-5 microsphere with controllable mesoporosity and its enhanced LDPE cracking properties

Diffusion-enhanced ZSM-5 aggregates by n-hexylamine directing are obtained with easy control on mesopore and the possible growth mechanism is proposed.

Aerosol-assisted synthesis of nano-sized ZSM-5 aggregates

An aerosol-assisted method is used to synthesize nano-sized ZSM-5 aggregates with good texture properties and Al species distribution.

Direct synthesis of high-silica nano ZSM-5 aggregates with controllable mesoporosity and enhanced catalytic properties

In the absence of additional mesoporous template, high-silica nano-sized ZSM-5 aggregates have been rapidly synthesized by solid-like state conversion.

Seed-induced synthesis of hierarchical ZSM-5 nanosheets in the presence of hexadecyl trimethyl ammonium bromide

Hierarchical ZSM-5 nanosheets with honeycomb morphology were synthesized by seed-inducing in the presence of hexadecyl trimethyl ammonium bromide as template.

Hydrothermal synthesis of single-crystalline mesoporous beta zeolite assisted by N-methyl-2-pyrrolidone

A novel synthesis of single-crystalline mesoporous beta zeolite with high catalytic activities by addition of low-cost N-methyl-2-pyrrolidone (NMP) into a conventional TEAOH-based zeolite synthesis system.