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Silicalite-1 Crystals Etched with Hydrofluoric Acid Dissolved in Water or Acetone
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SYSNO ASEP 0346414 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Silicalite-1 Crystals Etched with Hydrofluoric Acid Dissolved in Water or Acetone Tvůrce(i) Brabec, Libor (UFCH-W) RID, ORCID
Kočiřík, Milan (UFCH-W) RID, ORCIDZdroj.dok. Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447
Roč. 114, č. 32 (2010), s. 13685-13694Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova silicalite-1 crystals ; acetone ; hydrofluorid acid Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP IAA400400909 GA AV ČR - Akademie věd CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000280727500040 DOI 10.1021/jp1027228 Anotace Highly siliceous (Si/Al ≈ 350) MFI-type crystals of various sizes and morphologies were etched with HF dissolved either in water or in acetone. The highest concentration of HF used was 4 wt % in water and 5.5 wt % in acetone with etching time shorter than 1 h. After rapid etching, the lateral faces of coffin-shaped crystals exhibited differently resistant triangular areas. Slow etching lasting weeks or months was performed in 100× diluted solutions and provided oriented rectangular pits corresponding to the point-group symmetry of MFI structure. Our coffin-shaped crystals were found to be twins of lateral faces as {100} consisting of two pyramidal segments ingrown to the crystal bed. Inner resistant triangle skins were found in calcined crystals indicating preferential deposition of organic residues on the segment interface. Such skins also appeared in small flat monocrystals at the top of the calcined polycrystalline layer. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2011
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