Abstract
A series of platinum supported on fumed titania catalysts has been prepared and investigated for activity in the oxidation of formaldehyde by molecular oxygen in aqueous media. Significant differences in catalytic activity are related to the catalyst genesis as determined by extensive physical characterization. Air calcination at 300°C prior to a hydrogen reduction step generates a more active catalyst than those materials that were produced by direct reduction of the Pt(NH 3) 2(NO 2) 2/TiO 2 precursor. Catalyst preparations that included calcination at 600°C are relatively poor catalysts for the oxidation of formaldehyde. The high temperature calcination produced a dispersed platinum (IV) oxide that was stabilized toward reduction and subsequently inactive as an oxidation catalyst. For each of the catalysts tested, activity correlated with platinum metal dispersion as determined by hydrogen titration and oxygen chemisorption measurements.
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