Direct synthesis of hierarchical binder-free ZSM-5 and catalytic properties for MTP

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

“…The latter was applied by Zhao et al wherein a mesoporous ZSM-5 was synthesized by alkaline etching of shaped precursors using trimethylamine and ethylenediamine. [183] A solid-state crystallization was introduced by Wang et al In a first step they produced aluminosilicate nanogels resulting in dried nanoparticles. Next, transformation of the particles to zeolites relied on the intrinsic water content, and gave fused nanocrystals with stable mesoporosity.…”

“…wherein a mesoporous ZSM‐5 was synthesized by alkaline etching of shaped precursors using trimethylamine and ethylenediamine. [ 183 ] A solid‐state crystallization was introduced by Wang et al. In a first step they produced aluminosilicate nanogels resulting in dried nanoparticles.…”

Effect of ZSM-5 zeolite porosity on catalytic cracking ofn-heptane

“…[1][2][3][4] However, the small pore size of ZSM-5 zeolites inhibits the diffusion of molecules inside the pores, which leads to pore blocking and rapid deactivation of zeolite-based catalysts and adsorbents. [3][4][5][6] A way to solve these problems is to construct the hierarchically porous zeolites with a supplementary meso or/and macroporous structure. [7][8][9][10][11] There are two different routes for the synthesis of the hierarchical zeolites; the top-down method through the reorganization of the lattice of the zeolite crystals and the bottom-up process via the formation of meso or macropores during the crystallization of the zeolites.…”

Hierarchical Nanospherical ZSM-5 Nanosheets with Uniform Al Distribution for Alkylation of Benzene with Ethanol

“…To date, zeolites have been extensively used as heterogeneous catalysts in the refinery and petrochemical processes because of their superior properties involving the shape-selective properties and the suitable acidity . Unfortunately, a conventional zeolite having the pure microporous structures often suffers from pore diffusion limitations, resulting in poor mass transport as well as low accessibility of guest molecules into the active sites. , In addition, the micropores of zeolites facilitate the secondary reactions, eventually leading to coke formation and catalyst deactivation. , The strategy to overcome these drawbacks is to introduce the additional larger pores such as mesopores and macropores into the zeolite network. − As a result, the modified zeolites comprising microporous networks together with additional meso- or macroporous structures, namely, hierarchical zeolites, can facilitate the diffusion of large molecules of reactants and products to and from the active sites, and suppress the coke formation from the undesirable secondary reactions. , …”