Surface and structural properties of zirconia-supported vanadium oxide

Valigi, M.; Gazzoli, Delia; Ferraris, Giovanni; Rossi, S. De; Spinicci, R.

doi:10.1016/j.molcata.2004.10.007

Cited by 5 publications

(1 citation statement)

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“…In general, the equilibrium adsorption procedures allow better dispersion of the active phase and this method has been used by Valigi and coworkers [13][14][15][16] to prepare various zirconia-based catalysts starting from amorphous ZrO x (OH) 4-2x . These authors demonstrated the role of the solution pH in determining both the adsorption properties of the support and the predominant ionic form of the precursor.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic characterization of tungstated zirconia prepared by equilibrium adsorption from hydrogen peroxide solutions of tungsten(VI) precursors

Kantcheva

Koz

2007

J Mater Sci

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. The starting material is amorphous zirconium oxyhydroxide. The maximum W densities obtained are larger than that reported in the literature for systems synthesized by the same method using aqueous non-peroxide solutions. In the case of the metatungstate precursor, this increase is attributed to the generation of additional anchoring sites by interaction between the amorphous support and H 2 O 2 . The high uptake achieved when the peroxo complex is used as a precursor is a result of both the ZrO x (OH) 4-2x -H 2 O 2 interaction and low nuclearity of the adsorbing anion. The materials are characterized by XRD, DR-UV-vis, Micro-Raman and FT-IR spectroscopy. The surface acidities of samples with identical W loading prepared by equilibrium adsorption from the [H 2 W 12 O 40 ] 6--H 2 O 2 system and by impregnation with aqueous solution of ammonium metatungstate are investigated by FT-IR spectroscopy of CO adsorbed at 80 K.

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Section: Introductionmentioning

confidence: 99%