Synthesis of hierarchical lamellar MFI zeolites with sequential intergrowth influenced by synthetic gel composition

Synthesis and performance evaluation of hydrocracking catalysts: A review

“…The proposed zeolite synthesis method using the dual-functional surfactant provides guidance for potentially synthesizing various hierarchically-structured zeolites with tailored mesoporosity. On the other hand, hierarchical lamellar zeolites were synthesized using sequential intergrowth induced by the variation of synthetic gel composition [64]. Compared to classical approaches, a rather simple gel composition was used.…”

One step dual template facile synthesis of Micro-Mesoporous ZSM-5 Composite and its application in 5-(ethoxymethyl)furfural (biofuel additive) synthesis

“…Quanyiwang et al [14] reported mesoporous ZSM-5 using single step hydrothermal method using two mesoporous templates such as dimethyl octadecyl [ 3-(trimethoxysilyl)propyl] ammonium chloride (TPOAC) and CTABr, leads to formation mesoporous ZSM-5, but with very low crystallinity. Hierarchical lamellar mesoporous ZSM-5 reported by Laleh Emdadi et al [11], was synthesized by using diquaternary ammonium surfactant ([C 22 H 45 -N + (CH 3 ) 2 -C 6 H 12 -N + (CH 3 ) 2 -C 6 H 13 ]Br − 2 ) templateat 150 C. In the prior art, mesoporous ZSM-5 was synthesized by dual template insitu method has comparatively higher mesopore volume and mesopore surface area assigned as external surface area than micropore volume and surface area. This mesoporosity generation in excess has destroyed the ZSM-5 framework in a major way and increases the contribution of amorphous nature which limits its application as micro-meso composites.…”

“…[8-10] However, ZSM-5 have limitations to catalyze bulky reagent due to small micro pore size (0.55nm) which impose diffusional constraints in the micropore channels. [11] Signi cant research efforts have been made in the past two decade to prepare micro-mesoporous composite zeolites, by insitu dual templates well as post modi cations methods such as dealumination and desilication. [11][12][13][14][15][16] Amongst these methods, generation of mesoporosity by in situ method has certain advantages over post modi cation methods in terms of simple synthesis, avoid multi steps to follow which also account towards increase in cost.…”

“…[11] Signi cant research efforts have been made in the past two decade to prepare micro-mesoporous composite zeolites, by insitu dual templates well as post modi cations methods such as dealumination and desilication. [11][12][13][14][15][16] Amongst these methods, generation of mesoporosity by in situ method has certain advantages over post modi cation methods in terms of simple synthesis, avoid multi steps to follow which also account towards increase in cost. Thus, this work is an attempt to create mesoporosity in ZSM-5 by in situ dual template method.…”

“…It is always recommended to use easily available and cheap source of silica and alumina to make Micro-mesoZSM-5 composite cost effective. As per the reported information, comparatively expensive raw material such as tetra ethyl orthosilicate, aluminiumisoproxide, tetrapropyl ammonium hydroxide [11,[14][15][16]] were used at higher crystallization temperature and time. Here, we report probably the synthesis of micro-mesoporous ZSM-5 composite with controlled mesoporous generation using cheaper silica and alumina source at conventional hydrothermal treatment.…”