Abstract
Two percent ( Pt + Re) Al 2O 3 catalysts prepared by co-impregnation of Al 2O 3 with H 2PtCl 6 and Re 2O 7 and generally reduced by hydrogen at 500 °C were mainly investigated by thermogravimetry (H 2O 2 cycles at 25 °C), electron microscopy, and infrared spectroscopy (chemisorption of CO at 25 °C). The greater reducibility in the presence of Pt of oxygen chemisorbed by Re, and the vCO frequency shifts of the PtCO and ReCO species against the percentage of Re indicated a strong interaction between both metals. Most probably Pt and Re are alloyed. The H 2O 2 cycles at 25 °C allowed the determination of the overall dispersion of the (Pt + Re) phase while the optical density of the infrared band of CO adsorbed on platinum gave some information about the surface concentration of Pt in the (Pt + Re) phase.
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