Studies on PtxInyBimetallics in NaY

In a previous paper the preparation and the characterization of PtNaY and PtInNaY were reported. Here, complementary characterization results obtained by studying the TPD of CO by mass spectrometry coupled with IR studies of the adsorbed CO phases indicated no apparent change in the electronic properties of Pt. Comparison of catalytic properties for n -butane hydrogenolysis between PtNaY and PtInNaY indicated that the hydrogenolysis is deeply affected by the addition of In to Pt; the kinetic parameters (apparent activation energy, relative order for butane and for hydrogen) are modified by In addition. These results are explained considering that In is acting more like a diluent of Pt atoms than as an electronic modifier of Pt.