V. K. Yatsimirskii

Catalysis of the oxidation of hydrogen by a platinum-acetylacetone complex anchored on silica

By binding platinum ions with acetylacetone immobilized on a silica surface, we have obtained a metal complex catalyst containing Pt(II). We have also studied its catalytic activity in the model reaction of oxidation of hydrogen. We have shown that over the course of the catalytic process, this catalyst exhibits high catalytic activity at room temperatures and displays the “surface memory” effect with respect to a previous reaction. The activity of the grafted Pt complex is significantly higher than the activity of a supported platinum catalyst.

The influence of hydrogen-containing molybdenum and tungsten bronzes on the catalytic activity of palladium composite catalysts for the oxidation of H 2 , CO, and CH 4

The influence of hydrogen-containing molybdenum and tungsten bronzes on the catalytic activity of palladium composite catalysts for the oxidation of H2, CO, and CH4 was studied. It was found that the composite catalysts containing HxMO3 phases (M = W or Mo), which were formed by the reduction of MoO3 and WO3 oxides with hydrogen in the presence of deposited Pd, showed higher catalytic activity in the oxidation of small molecules (H2, CO, and CH4) with excess oxygen than the traditional Pd/Al2O3 deposited catalyst with the same content of the deposited metal. It was shown that the thermal stability of the HxMO3 phases was the limiting factor influencing the activity of these composite catalysts.

Oxidation of Hydrogen on Complexes of Platinum and Palladium with N-Allyl-N´-propylthiourea Immobilized on Silica Surfaces

Complexes of platinum and palladium with N-allyl-N´-propylthiourea immobilized on an SiO2 surface have high catalytic activity in the oxidation of hydrogen in the temperature range 273-373 K after partial destruction of the ligand. The kinetics of the oxidation of hydrogen is in accord with the Eley–Rideal mechanism.

Characteristics of the Oxidation of Carbon Monoxide on Platinum and Palladium Acetylacetonates Immobilized on a Silica Surface

Characteristics of the kinetics of the oxidation of carbon monoxide on acetylacetonates of palladium and platinum immobilized on a silica surface have been studied. The bound metal complexes show no hysteresis in the dependence of the rate of reaction on the concentration of CO and O2 and have a higher catalytic activity than Pt/SiO2 and Pd/SiO2. A mechanism is proposed for the oxidation of carbon monoxide on platinum and palladium complexes bound to a SiO2 surface.