A facile method for the fabrication of IM-5 hollow zeolite sphere in emulsion system

Wang, Lei; Yang, Weiran; Ling, Fengxiang; Shen, Zhiqi; Yang, Ruochen; Sun, Wei; Fang, Xiangchen; Ji, Honghai

doi:10.1016/j.micromeso.2012.06.032

Cited by 16 publications

(12 citation statements)

References 33 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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“…At this stage, most Fe species were isolated Fe in framework positions. In contrast with the previously reported hard template, alkaline etching, , and surfactant-assisted methods, the present work involves a one-pot hydrothermal method using a micropore-directing template and preferential surface crystallization involving an Fe-containing organic precursor for the synthesis of the MFI-type hollow zeolite nanovesicle.…”

Section: Results and Discussionmentioning

confidence: 99%

Hollow Alveolus-Like Nanovesicle Assembly with Metal-Encapsulated Hollow Zeolite Nanocrystals

et al. 2016

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Inspired by the vesicular structure of alveolus which has a porous nanovesicle structure facilitating the transport of oxygen and carbon dioxide, we designed a hollow nanovesicle assembly with metal-encapsulated hollow zeolite that would enhance diffusion of reactants/products and inhibit sintering and leaching of active metals. This zeolitic nanovesicle has been successfully synthesized by a strategy which involves a one-pot hydrothermal synthesis of hollow assembly of metal-containing solid zeolite crystals without a structural template and a selective desilication-recrystallization accompanied by leaching-hydrolysis to convert the metal-containing solid crystals into metal-encapsulated hollow crystals. We demonstrate the strategy in synthesizing a hollow nanovesicle assembly of Fe2O3-encapsulated hollow crystals of ZSM-5 zeolite. This material possesses a microporous (0.4-0.6 nm) wall of hollow crystals and a mesoporous (5-17 nm) shell of nanovesicle with macropores (about 350 nm) in the core. This hierarchical structure enables excellent Fe2O3 dispersion (3-4 nm) and resistance to sintering even at 800 °C; facilitates the transport of reactant/products; and exhibits superior activity and resistance to leaching in phenol degradation. Hollow nanovesicle assembly of Fe-Pt bimetal-encapsulated hollow ZSM-5 crystals was also prepared.

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“…Hollow zeolitic materials have also been synthesized following the in situ seed‐free crystallization method using solid hard templates, nanocrystal self‐assembly via adjusting synthesis conditions and compositions, and the dual‐templating method . These studies are summarized in Table 6 .…”

Section: Synthesis Of Hollow and Yolk–shell Zeolitic 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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A facile method for the fabrication of IM-5 hollow zeolite sphere in emulsion system

Cited by 16 publications

References 33 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

Hollow Alveolus-Like Nanovesicle Assembly with Metal-Encapsulated Hollow Zeolite Nanocrystals

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

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