Abstract
Diffuse reflectance IR spectra of CO adsorbed on Pt/Mg(Al)O catalysts were studied at room temperature and different surface coverages of metallic Pt. They show the existence of two types of metallic Pt particles. One type has a normal behavior toward the adsorption of CO, which is probably related to the lower dispersion of Pt. The other type probably corresponds to smaller negatively charged clusters like those found for Pt-loaded alkaline and alkaline-earth forms of zeolites. They are characterized by the very low frequency of the singletone corresponding to the linear form of adsorbed CO and high thermal stability of the bridging complexes of CO with metallic Pt. Such by metal-support interaction modified platinum is likely responsible for high activity and selectivity of Pt/Mg(Al)O catalyst inn-alkanes aromatization.
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