Construction of Single‐Crystalline Hierarchical ZSM‐5 with Open Nanoarchitectures via Anisotropic‐Kinetics Transformation for the Methanol‐to‐Hydrocarbons Reaction

Abstract

We report an anisotropic‐kinetics transformation strategy to prepare single‐crystalline aluminosilicate MFI zeolites (ZSM‐5) with highly open nanoarchitectures and hierarchical porosities. The methodology relies on the cooperative effect of in situ etching and recrystallization on the evolution of pure‐silica MFI zeolite (silicalite‐1) nanotemplates under hydrothermal conditions. The strategy enables a controllable preparation of ZSM‐5 nanostructures with diverse open geometries by tuning the relative rate difference between etching and recrystallization processes. Meanwhile, it can also be extended to synthesize other heteroatom‐substituted MFI zeolite nanocages. Compared with conventional ZSM‐5 microcrystals, nanocrystals, and nanoboxes, the ZSM‐5 nanocages with single‐crystalline nature, highly open nanoarchitectures, and hierarchical porosities exhibit remarkably enhanced catalytic lifetime and low coking rate in the methanol‐to‐hydrocarbons (MTH) reaction.

Defect-Guided Synthesis of Hierarchical Sn-B-Beta Zeolite with Highly Exposed Sn Sites

“…26−30 The basic organic structure directing agent (OSDA) can be used as etching agent for desilication to create mesopores. 31,32 On the other hand, the OSDA can also serve as template for assembling the building units into the zeolite structure. 13,33,34 Therefore, the dual-functional OSDA holds the promise to incorporate Lewis acid heteroatoms during constructing the mesoporous structure through an etching-regrowth route.…”

Facile and fast synthesis of highly active Lewis acid MWW zeolite from pure silica ITQ-1

“…27,28 Then, a part of the nest-form defects will be either healed by the migrated Si species or the newly introduced Sn species. 27,29…”

“…This is reasonable owing to the common etching effect of the basic SDA. 29,30 The TEM images of Si-MWW (Fig. 2a) and Sn-MWW-250 (Fig.…”

Revolutionizing CO2 Electrolysis: Fluent Gas Transportation within Hydrophobic Porous Cu2O

“…As is well known, a trade-off effect lies between active site exposure and mass transfer in porous materials, i.e., smaller pores benefit active site exposure but larger pores favor mass transfer. 27,28 Therefore, exploring the pore size effect on gas transport and active site exposure is of great importance to realize the full utilization of the porous channels. However, it remains largely unexplored, partially because of the lack of S1).…”