INFLUENCE OF MGO LOADING ON THE STRUCTURE AND CATALYTIC PERFORMANCE OF PD GAMMA-AL2O3, .2. COMPETITIVE ADSORPTION PROPERTIES OF PALLADIUM CATIONS ON MGO/GAMMA-AL2O3/

Partitioning adsorption properties of palladium cations on composite s upports of MgO/gamma-Al2O3 were explored by IR, TPR and catalytic perf ormance tests for CO oxidation. The experimental results revealed that palladium cations in conventional impregnation was dispersed complete ly on gamma-Al2O3, when the amount of MgO in the samples was lower tha n 5%. For the catalysts prepared by double impregnation, part of palla dium dispersed on MgO phase due to the complexing action of EDTA. Pd-M gO interaction suppressed the reaction of CO oxidation.