Fabrication of hollow spheres composed of nanosized ZSM-5 crystals via laser ablation

Xiong, Chengdong; Coutinho, Decio; Balkus, Kenneth J.

doi:10.1016/j.micromeso.2005.05.052

Cited by 34 publications

(30 citation statements)

References 44 publications

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“…Similar studies have also been reported for other metal oxides such as zeolite [29][30][31][32][33] and titania. [34][35][36] Among metal oxides of special morphology, porous thin-film microparticles of 1-10 μm in diameter and 1-100 nm in thickness are also interesting as a functional material.…”

Section: Introductionsupporting

confidence: 87%

Preparation of porous thin-film polymethylsiloxane microparticles in a W/O emulsion system

Mishima

Okada

Sakai

et al. 2015

Polym J

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(Abstract)Porous thin-film polymethylsiloxane microparticles have been prepared successfully from octyltrichlorosilane and methyltrichlorosilane in W/O emulsion system by using several oil phase and changing the amount of the silanes or a surfactant Span 60.Hollow microspheres of various shell thickness (120-180 nm) with high surface area were prepared by using four kinds of nonpolar solvents as oil phase of the W/O emulsion. Diameter of the spheres can also be controlled (1-1.6 μm) by using different oil phase. Results of thermal analysis, nitrogen adsorption isotherm, IR spectra and XRD data showed that hollow microspheres of amorphous polymethylsiloxane with high surface area (360-385 m 2 g -1 ) can be obtained by heat treatment in the air at 673K and the microspheres turn to nonporous silica particles after calcination at 873K for 3 h.Cup shape microparticles of polymethylsiloxane with nano-order thickness (20-120 nm) was prepared by using smaller amounts of silanes. Small hollow particles were prepared by replacing small amounts of octyltrichlorosilane with Span 60.4

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Section: Introductionsupporting

confidence: 87%

Preparation of porous thin-film polymethylsiloxane microparticles in a W/O emulsion system

Mishima

Okada

Sakai

et al. 2015

Polym J

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“…Furthermore, fly ash cenosphere (FAC, an aluminosilicate-rich waste from power plants) is used as a hollow spherical template and nutriments to prepare hollow zeolitic microspheres with cancrinite zeolite shell through in situ transformation of FAC in vapor phase. [675][676][677] Xiong et al 678 employed spherical mesoporous DAM-1 or SBA-15 as a silicon source and substrate to prepare hollow ZSM-5 spheres by using a combination of pulsed laser deposition (PLD) and VPT processes. The size of ZSM-5 crystals in the shell can be easily adjusted by changing the crystallization time or PLD coating thickness.…”

Section: Hierarchically Micro-macroporous Structuresmentioning

confidence: 99%

Hierarchically porous materials: synthesis strategies and structure design

et al. 2017

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“…Also, some novel architectures of core–shell materials, e.g., yolk–shell structures, facilitate the access of molecules to the inner parts of the material, which could be, in some cases, negatively affected by the direct contact between the shell and the core components . Moreover, it is interesting to combine zeolites with different materials having various functionalities into a single unit, especially in catalysis . Such multifunctionality is critical to increase the efficiency of processes which comprise multistep reactions.…”

Section: Overcoming Zeolites Limitationsmentioning

confidence: 99%

“…A repetitive procedure for the surface modification and seeding steps, i.e., LBL, might also be needed in order to ensure an effective and uniform coverage of the core surface or to synthesize multilayered structures. Although the deposition of seeds by electrostatic attraction on modified core templates has been the most commonly used technique for achieving a proper seeding of the core, pulsed laser deposition was also proposed as an alternative technique to cover mesoporous silica core particles . The secondary growth is the last step that can be done using a conventional hydrothermal method or the DGC technique.…”

Section: Synthesis Of Core@zeolite Materialsmentioning

confidence: 99%

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core–Shell Materials

2018

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The term "engineered zeolitic materials" refers to a class of materials with a rationally designed pore system and active-sites distribution. They are primarily made of crystalline microporous zeolites as the main building blocks, which can be accompanied by other secondary components to form composite materials. These materials are of potential importance in many industrial fields like catalysis or selective adsorption. Herein, critical aspects related to the synthesis and modification of such materials are discussed. The first section provides a short introduction on classical zeolite structures and properties, and their conventional synthesis methods. Then, the motivating rationale behind the growing demand for structural alteration of these zeolitic materials is discussed, with an emphasis on the ongoing struggles regarding mass-transfer issues. The state-of-the-art techniques that are currently available for overcoming these hurdles are reviewed. Following this, the focus is set on core-shell composites as one of the promising pathways toward the creation of a new generation of highly versatile and efficient engineered zeolitic substances. The synthesis approaches developed thus far to make zeolitic core-shell materials and their analogues, yolk-shell, and hollow materials, are also examined and summarized. Finally, the last section concisely reviews the performance of novel core-shell, yolk-shell, and hollow zeolitic materials for some important industrial applications.

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Fabrication of hollow spheres composed of nanosized ZSM-5 crystals via laser ablation

Cited by 34 publications

References 44 publications

Preparation of porous thin-film polymethylsiloxane microparticles in a W/O emulsion system

Preparation of porous thin-film polymethylsiloxane microparticles in a W/O emulsion system

Hierarchically porous materials: synthesis strategies and structure design

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core–Shell Materials

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