Vanadia gel synthesis via peroxovanadate precursors. 1. In situ laser Raman and V NMR characterization of the gelation

Article Abstract:

A summary of spectral assignments for laser Raman and NMR characterization with spectroscopic studies of representative materials prepared by V2O5-based catalysts is studied. The results indicate that at lower H2O2 and vanadium concentrations, the addition of excess H2O2 increases the duration of the diperoxovanadate stability.

Nuclear magnetic resonance spectroscopy, NMR spectroscopy

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Supported tantalum oxide and supported vanadia-tantala mixed oxides: structural characterization and surface properties

Article Abstract:

Silica-, alumina-, and zirconia-supported tantalum oxide and supported vanadia-tantala mixed oxide catalysts were investigated by XRD, UV-vis-DR, FTIR, and FT-Raman spectroscopoy to determine the nature of the surface tantala species. Two types of surface TaO(sub x) species were identified.

Primary nonferrous metals, not elsewhere classified, Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Tantalum, Zirconium, Silica, Aluminum

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Vanadium-incorporated MCM-48 materials: optimization of the synthesis procedure and an in situ spectroscopic study of the vanadium species

Article Abstract:

Gemini surfactants are used to prepare highly crystalline and porous vanadium-incorporated MCM-48 materials. The synthesis proved that V ions in the MCM-48 are present as isolated surface species and incorporated species in the silica matrix.

Adsorption, Chemical synthesis

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