State of platinum in zirconia and sulfated zirconia catalysts

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1996 English Publisher:Springer Science and Business Media LLCJournal:Catalysis Letters, volume 40, pages 167-173 (issn: 1011-372X, eissn: 1572-879X,

Authors: Dennis E. Sparks; Ram Srinivasan; Burtron H. Davis;

doi: 10.1007/bf00815278

State of platinum in zirconia and sulfated zirconia catalysts

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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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