Dispersion State of Palladium on Zeolite Y and Catalytic Activities

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Abstract
Correlatios between the dispefsion state of palladium on, zeolite Y and their catalytic activities were studied. Palladium catalysts on zeolite Y were prepared by calcinations of Pd(NH8)2+-NaY in a1r and subsequently reducing in hydrogon strea. An electron microscopy was used to determine the size distribution, the average diameter of palladium particles and the number of palladium particles per unit are. The fact was revealed that the size distribution of palladium particle was controlled by the calcination temperature. The catalytic activities of these catalysts for dehydrogenation of cyclohexane were reasonably interpreted in terms of the total surface area of palladium particles per unit area of zeolites. For oxidation of propylene In the presence of steam, however, this interpretation was not applicable. Some informations on the mechanism of agglomeration of palladium ions on zeolite Y were obtained by the use of differential thermal analysis and X-ray diffraction method.

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