Zirconia-pillared tetrasilicic fluoromica

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00025a011· OSTI ID:6720606

Johnson, J W; Brody, J F; Alexander, R M; Yacullo, L N; Klein, C F ^[1]

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1. Exxon Research Engineering Co., Annandale, NJ (United States)

Zirconia-pillared tetrasilicic fluoromicas are prepared from sodium tetrasilicic mica, Na-[Mg[sub 2.5]Si[sub 4]O[sub 10]F[sub 2]], using a commercial zirconyl acetate solution as the source of the zirconium polyoxocation pillars. Reproducible results are conveniently obtained without any preliminary heating of the pillaring solution, and the pillaring reaction is performed at ambient temperature. The resulting zirconia-pillared mica has a consistently higher crystallinity and layer spacing than pillared clays prepared from zirconyl chloride solutions adn shows significantly higher thermal stability, an important factor in potential catalytic applications. Zirconia-pillared tetrasilicic fluoromica is a microporous material containing two-dimensional galleries with a height of 11 [angstrom]. The surface area is high, about 300 m[sup 2]/g. After treatment in steam at 760[degrees]C for 17 h, the surface area is reduced only to [approximately]200 m[sup 2]/g. Thus, very small particles of ZrO[sub 2] dispersed between 10-[angstrom]-thick mica layers have been stabilized. 39 refs., 7 figs., 3 tabs.

• OSTI ID: 6720606
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:1; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POROSITY
SCATTERING
SILICON COMPOUNDS
SILICON FLUORIDES
SILICON HALIDES
SILICON OXIDES
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM FLUORIDES
ZIRCONIUM OXIDES