Nanosized and hierarchical zeolites: A short review

Koohsaryan, Esmat; Anbia, Mansoor

doi:10.1016/s1872-2067(15)61038-5

Cited by 237 publications

(140 citation statements)

References 136 publications

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“…However, the burdensome multistep procedure and costly templates hinder industrial application for large‐scale production. Furthermore, the combination of reduction in zeolite size and integration of intracrystalline hierarchical structure into zeolites would be beneficial . In spite of very demanding applications, successful studies on the preparation of nanosized colloidal zeolites with a hierarchical structure are rarely reported.…”

Section: Introductionsupporting

confidence: 68%

“…However, complex catalytic processes often include reactions occurring at the external surface of zeolite crystals, which impose more demands on zeolite engineering . Despite great efforts to introduce mesoporosity into zeolites, in practical applications, zeolites are micrometers in size, with a negligible external surface area relative to their inner pore structure, and impedance against surface engineering . Nanosized zeolites provide enhanced external surface areas, short diffusion path lengths, and customized surface properties, which has brought them to the foreground in recent decades .…”

Section: Introductionmentioning

confidence: 99%

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A Topotactic Synthetic Methodology for the Synthesis of Nanosized MFI Zeolites with Hierarchical Structures

Wang

et al. 2018

Chemistry A European J

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Much effort has been invested in the designed synthesis of zeolites with nanosized and hierarchical structures in recent decades, on account of increasing demands in practical applications, especially catalysis. Herein, a new topotactic synthetic strategy is demonstrated to synthesize nanosized and hierarchical zeolites in a one-step procedure. By using silica spheres as the adjustable amorphous precursors and tetrapropylammonium hydroxide as a structure-directing agent, effortless control of both size and porosity can be achieved in this system with no extra templates. With a simple hydrothermal process, hierarchical zeolite spheres can be modified with acid cites (Al species incorporated in the framework). Benefitting from its mesoporosity, palladium nanoparticles are incorporated into the nanosized hierarchical zeolite, which makes the materials suitable for use in a cascade catalysis reaction of benzimidazole derivatives, including independent acid catalysis and hydrogenation sites. The nanocomposites show exceptional activity and stability in catalysis and recycling reaction. This strategy can be developed into other versatile and practicable scaffolds for advanced zeolite catalytic nanoreactor systems.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

A Topotactic Synthetic Methodology for the Synthesis of Nanosized MFI Zeolites with Hierarchical Structures

Wang

et al. 2018

Chemistry A European J

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“…The proposed methods are based on the use of natural silica-alumina raw materials and inexpensive reagents (HCl, NaOH), are characterized by the relative rapidity, low energy expenditures and low Sheldon's factor E. According to the modern review [14], "template-free synthetic routes such as desilication/recrystallization will be used industrially in the future".…”

Section: Methodsmentioning

confidence: 99%

Synthesis of lta type zeolites from georgian clinoptilolite

Dolaberidze¹,

Tsitsishvili²,

Mirdzveli³

et al. 2017

Him. Fiz. Tehnol. Poverhni

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“…The ordered microporous systems of zeolites confer them shape‐selectivity properties, albeit internal mass transfer limitations may be important along with pore blockage and fast catalyst deactivation, especially when the desired reaction products are relatively bulky molecules, such as oligomers . Thus, great focus has been put on developing improved versions of zeolites with enhanced active sites accessibility, allowing facilitated mass transfer in/out of the pores, while benefiting from zeotype features (structural order at the atomic level, tunable surface properties and shape selectivity) . This may be accomplished with the introduction of mesoporosity in zeolites via bottom‐up or top‐down synthetic approaches .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

et al. 2019

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The oligomerisation of light olefins, obtainable from fossil/renewable sources and refinery streams, is an attractive route to produce clean synthetic fuels and added‐value chemicals. ZSM‐5 is a type of catalyst used in commercial olefin oligomerisation processes. Using appropriate modification procedures, it was possible to prepare catalysts with improved performances. Various modified versions of commercially available ZSM‐5 were prepared and investigated for 1‐butene oligomerisation under high‐pressure, continuous‐flow operation (30 bar, 200 °C). Simple, up‐scalable top‐down strategies involving base‐acid treatments of ZSM‐5 led to catalysts possessing enlarged pores and the required acidity for converting 1‐butene to higher molar mass products. In targeting diesel type products, the modified catalysts led to up to 86 % butenes conversion, space time yield of 852 mg gcat−1 h−1 and mass ratio diesel:naphtha cuts of 2.2. Characterisation studies and multivariate/principal component analysis helped categorise the differently prepared catalysts, and gain insights into complex interplay of material properties influencing the catalytic reaction.

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Nanosized and hierarchical zeolites: A short review

Cited by 237 publications

References 136 publications

A Topotactic Synthetic Methodology for the Synthesis of Nanosized MFI Zeolites with Hierarchical Structures

A Topotactic Synthetic Methodology for the Synthesis of Nanosized MFI Zeolites with Hierarchical Structures

Synthesis of lta type zeolites from georgian clinoptilolite

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

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