Tantalum-pillared montmorillonite: I. Synthesis and physicochemical characterization

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1637· OSTI ID:539469

Guiu, G; Gil, A; Grange, P ^[1]

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1. Universite Catholique de Louvain (Belgium); and others

The synthesis method of a stable, large-pore tantalum-pillared montmorillonite family (Ta-PILC) and its physicochemical characterization are reported. The clay used is a sodium montmorillonite. The tantalum pillaring solution is prepared by careful control of the hydrolysis of a tantalum alkoxide precursor, Ta(OC{sub 2}H{sub 5}){sub 5}, in an ethanolic acidic solution. From XRD analysis it has been concluded that the Ta-PILC possesses a high thermal stability, the pillared structure is preserved even after calcination at 600{degrees}C, and the basal spacing, 26 {Angstrom} at 500{degrees}C, is one of the greatest values described in the literature. On the basis of the bibliographic data concerning tantalum alkoxide hydrolysis and condensation, and taking into account the experimental results obtained for this series of Ta-PILCs, a structure of type [Ta{sub 8}O{sub 10}(OR){sub 20}], R = H, C{sub 2}H{sub 5}, has been proposed as the precursor molecule of the tantalum pillars. 28 refs., 9 figs., 3 tabs.

• OSTI ID: 539469
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 168; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCINATION
HYDROLYSIS
MONTMORILLONITE
PORE STRUCTURE
SODIUM COMPOUNDS
STABILITY
TANTALUM COMPOUNDS
THERMAL ANALYSIS
X-RAY DIFFRACTION