In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
- Gambaro, Luis Alberto
- Briand, Laura Estefania
DOIAbstract
Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly activ...
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