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- W2133961737 abstract "Macroporous glass beads (Na2O–B2O3–SiO2) with a particle diameter of ∼300 μm and an average pore diameter of 92 nm, obtained by the VYCOR-process, were transformed into MFI-type containing beads, that retained the original shape. The conversion was achieved through a hydrothermal treatment with an aqueous mixture of an Al-source (sodium aluminate or aluminum sulfate) and a template (tetrapropylammonium bromide (TPABr) or dipropylamine (DPA)). The resulting products were characterized by X-ray diffraction, 11B MAS NMR, N2-adsoption and SEM. The filtrates were analyzed by ICP-OES. Using two different templates and two kinds of Al-source MFI-type beads with varying properties were obtained. The boron atoms, which are constituents of the glass material, were used as probe atoms for the characterization of the synthesis procedure. With DPA the crystallization took place inside and on the outer surface of the spheres, while TPABr led to a shell like crystallization starting from the outer surface of the glass particles. The type of Al-source influences the pH value of the reaction mixture and varies the Si/B ratio in the obtained products." @default.
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- W2133961737 date "2002-09-01" @default.
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- W2133961737 title "Transformation of porous glass beads into MFI-type containing beads" @default.
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- W2133961737 doi "https://doi.org/10.1016/s1387-1811(02)00402-x" @default.
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