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Silicalite-1 Crystals Etched with Hydrofluoric Acid Dissolved in Water or Acetone

SYSNO ASEP	0346414
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Silicalite-1 Crystals Etched with Hydrofluoric Acid Dissolved in Water or Acetone
Author(s)	Brabec, Libor (UFCH-W)_{RID, ORCID} Kočiřík, Milan (UFCH-W)_{RID, ORCID}
Source Title	Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447 Roč. 114, č. 32 (2010), s. 13685-13694
Number of pages	10 s.
Language	eng - English
Country	US - United States
Keywords	silicalite-1 crystals ; acetone ; hydrofluorid acid
Subject RIV	CF - Physical ; Theoretical Chemistry
R&D Projects	IAA400400909 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z40400503 - UFCH-W (2005-2011)
UT WOS	000280727500040
DOI	10.1021/jp1027228
Annotation	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.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2011

Number of the records: 1