Yatsymyrskyy A. The adsorption-catalytic and physicochemical properties of the supported Pd and Pd-Ag catalyst for CO oxidation

Catalytic activity was investigated in CO oxidation of the supporters such as diamonds, ZrО2, mechanochemical activated ZrО2, YSZ (yttria stabilised zirconia). It was shown that YSZ has maximum and diamond has minimum activity. Al2O3 are not active under the same conditions. A TDS and XPS investigation of supporter surface was conducted. The influence of OH-groups on the catalytic activity was established. The catalytic properties of a supported Pd, Pd-Ag catalysts were investigated. It was shown that catalytic activity of the supported catalysts is decreased by set of supporters such as Al2O3, diamond, PAC (pit activated charcoal), graphite, ZrО2. The kinetics of the CO oxidation was investigated on supported Pd, Pd-Ag catalysts. Mechanism of CO oxidation on Pd-Ag catalysts was suggested. Kinetic equation, which was obtained from this mechanism, agrees well with experiment. It was shown that electronic state of palladium depends on its dispersion and supporter influence. They have noticeable influenceto its catalytic activity. High catalytic activity of Pd-Ag catalysts is caused by generation of the ensembles . These ensembles adsorb CO weakly.