Abstract
Platinum is present in a metallic state following activation in air at 725‡C of both 5 wt% Pt/ZrO2 and 5 wt% Pt/SO 4 2− /ZrO2. Reduction of either catalyst at 725‡C produces a Pt-Zr alloy, and these reduced catalysts, upon recalcination in air at 725‡C, form metallic Pt crystallites. Likewise, reduction of these uncalcined catalysts at 725‡C in H2 leads to a Pt-Zr alloy formation. However, treatment of these uncalcined catalysts in H2 at 450‡C does not produce Pt crystallites large enough to detect by XRD.
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