Abstract
USY (Ultra Stable Y-type Zeolite) supported Pd-Pt catalysts (Pd-Pt/USY) are efficient for deep dearomatization of diesel fuel, and they show higher activity than monometallic Pd catalysts The in-situ XAFS (X-ray absorption Fine Structure) technique was applied to structural analysis of Pd and Pd-Pt particles supported on USY to elucidate the effect of Pt. During reduction, monometallic Pd and Pt particles gathered to form a Pd-Pt alloy particle. Upon exposure to H2S Pt atoms were almost completely sulfided, whereas, some part of the Pd atoms remained as metallic particles. It is concluded that Pt atoms were localized on the surface of metal particles in Pd-Pt/USY.
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