Preparation of Supported Palladium Catalyst for Selective Hydrogenation of Phenylacetylene by Double Impregnation Method

Abstract

In this paper, Pd-Pb/CaCO₃ catalysts for selective hydrogenation of phenylacetylene were prepared by double impregnation method, which was compared with those prepared by conventional impregnation method, and the results showed that the addition of a certain amount of EDTA could improve the catalytic selectivity significantly. When impregnation ratio was 10 g CaCO₃/10 mL EDTA, absorption rate of hydrogen was moderate and selectivity was highest (95.9 %). This was possible due to the fact that the addition of EDTA leads to a balanced increase of terrace type surface.