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- W2065807653 abstract "Core–shell zeolite composites possessing a core and a shell of different zeolite structure types have been synthesized. A characteristic feature of the obtained composites is the relatively large single-crystal core and the very thin polycrystalline shell. The incompatibility between the core crystals and the zeolite precursor mixture yielding the shell layer has been circumvented by the adsorption of nanoseeds on the core surface, which induced the crystallization of the shell. The pretreated core crystals are subsequently subjected to a continuous growth in a zeolite precursor mixture. The feasibility of this synthetic approach has been exemplified by the preparation of core–shell β-zeolite–silicalite-1 composites. The synthesized composites have been characterized using X-ray diffraction, high-resolution transmission electron microscopy, and scanning electron microscopy. The integrity of the shell layer has been tested via N2-adsorption measurements on materials comprising a calcined core (β-zeolite) and a non-calcined tetrapropylammonium (TPA)-containing shell, the latter being non-permeable for the N2 molecules. These measurements have shown that 86 % of the β-zeolite crystals are covered with a defect-free TPA–silicalite-1 shell after a single hydrothermal treatment, while after three consecutive crystallization steps this value reaches 99 %. The shell integrity of the calcined composite has been studied by the adsorption of butane, toluene, and 1,3,5-trimethylbenzene, which confirmed the superior performance of the triple-shell composites." @default.
- W2065807653 created "2016-06-24" @default.
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- W2065807653 date "2005-12-01" @default.
- W2065807653 modified "2023-10-17" @default.
- W2065807653 title "Core-Shell Zeolite Microcomposites" @default.
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- W2065807653 doi "https://doi.org/10.1002/adfm.200500231" @default.
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