Preparation and Characterization of Palladium-Gold/4A Zeolite Catalyst

Abstract

Palladium-Gold(Pd-Au)/4A zeolite catalyst was prepared by using 4A zeolite as carrier and Pd-Au as active components. The structure of Pd-Au/4A zeolite catalyst was characterized by a combination of atomic absorption spectrometry (AAS), scanning electron microscopy (SEM) and X-ray diffraction (XRD).The AAS testing showed that Pd and Au supported rate were increased up to the maximum 93.88% and 90.22% respectively at the ratio of Pd/Au=1.16. The SEM analysis results indicated that Pd-Au alloy particles of 4A zeolite catalyst can grown up and reunited obviously through before and after reaction. The XRD analysis results showed that diffraction peak of Pd(111), Pd(200), Au(111) and Au(200) became sharp gradually with the extension of reaction time, crystalline phase composition and grain size of catalyst became bigger gradually. The catalytic activity of the Pd-Au /4A zeolite catalyst was elaborated in vinyl acetate synthesis and the results showed that Pd-Au/4A zeolite catalyst has excellent catalytic activity.