Preparation of metal oxide/zeolite core–shell nanostructures

Khan, Easir A; Hu, Enping; Lai, Zhiping

doi:10.1016/j.micromeso.2008.08.031

Cited by 28 publications

(18 citation statements)

References 34 publications

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“…Briefly, the mixture of water (22.0 mL) and TPAOH (13.4 mL) was stirred for 5 min, then TEOS (15.0 mL) was added drop-wise under vigorous stirring and the mixture was allowed to stand for 24 h, followed by hydrothermal treatment at 100 • C for 16 h. After crystallisation, the final product was separated by centrifugation and recovered as 0.05 mass % suspension in water after being washed with water (3 × 10 mL). The following seeding process was similar to the procedure already reported by Khan et al (2009) with some minor modifications. Typically, PdO/Al 2 O 3 beads (1.0 g) were successively treated with 0.3 mass % PSS solution (30 mL) and PDDA solution at ambient temperature for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Pd/Al2O3@silicalite-1 core–shell beads and their application to hydrogenation reactions

Zhang

Lin

et al. 2015

Chemical Papers

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Core-shell composite beads comprising a Pd-loaded Al2O3 core and a shell of inter-grown silicalite-1 (siliceous ZSM-5) crystals were synthesised. The incompatibility between the Pd/Al2O3 core and the zeolite shell was circumvented by a layer-by-layer self-assembly of polyelectrolyte to adsorb nanosized silicalite-1 seeds onto the core surface, followed by a secondary solvo-thermal treatment to form the continuous and well-intergrown silicalite-1 shell. The thickness of the outer zeolite shell could be tuned by monitoring the secondary growth time. When employed as catalyst for the hydrogenation reaction of alkenes to explore its full potential use, the Pd/Al2O3@silicalite-1 core-shell catalyst exhibited excellent size-selectivity, poison-resistance and leaching-proof properties. Such a catalyst@zeolite core-shell structure is expected to find promising applications in heterogeneous catalysis and adsorption.

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Section: Methodsmentioning

confidence: 99%

Preparation of Pd/Al2O3@silicalite-1 core–shell beads and their application to hydrogenation reactions

Zhang

Lin

et al. 2015

Chemical Papers

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“…A metal foil support was treated with a strong base and acids and a silica support was chemically modified via (3‐aminopropyl)trimethoxysilane grafting . The use of polyelectrolytes is the most common technique to perform the single or multilayer coating of differently charged soluble polymers . It should be mentioned that some studies where no surface modification was used prior to seeding were also reported .…”

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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“…The desirable final products, non-aggregated core@shell microspheres, should meet a set of quality criteria including the preserved core mesoporosity during the shell formation process, complete shell coverage, pore network connectivity between constituents of the composite, and the absence of free zeolite crystals in the bulk. Although there are few examples of core@zeolite that can be produced by using a onepot hydrothermal crystallization process [22][23][24][25][26] , the synthesis of a great number of zeolitic core@shell materials is only viable through a multi-step synthesis route 3,4,9,11,12,15,21,[27][28][29][30][31][32][33] . The multistep synthesis route usually involves preliminary adsorption of zeolite nanocrystals onto large core particles followed by growing these nanocrystals in an appropriate synthesis gel mixture 34,35 (Scheme 1).…”

Section: Page 3 Of 33 Crystengcommmentioning

confidence: 99%

Synthesis of microporous/mesoporous core–shell materials with crystalline zeolitic shell and supported metal oxide silica core

et al. 2016

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Preparation of metal oxide/zeolite core–shell nanostructures

Cited by 28 publications

References 34 publications

Preparation of Pd/Al2O3@silicalite-1 core–shell beads and their application to hydrogenation reactions

Preparation of Pd/Al2O3@silicalite-1 core–shell beads and their application to hydrogenation reactions

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

Synthesis of microporous/mesoporous core–shell materials with crystalline zeolitic shell and supported metal oxide silica core

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