ИСТИНА

CO oxidation is one of the most studied reactions both in terms of analyzing the key stages of heterogeneous catalytic processes and for the purpose of application for the removal of hazardous environmental pollutants. Modified zeolites containing two different metals may differ from mixed oxides in the mechanism of the synergistic effect in catalysis.Series of catalysts based on Co/Сe and Cu/Ce-modified zeolites ZSM-5 (Si/Al=15, 27.5 and 40) have been synthesized by sequential incipient wetness impregnation with 1.7 – 4 wt. % Сo, 2.6 - 4 wt. % Cu and 0 – 6 wt. % Ce. The total concentration of introduced metals was chosen in order to minimize the formation of oxides on the surface. The catalytic oxidation of carbon monoxide is carried out on modified Co/Ce/ZSM-5 and Cu/Ce/ZSM-5 zeolites at the temperatures of 50–200 °C. Based on TEM, XPS, UV-vis-DRS, DRIFTS and in situ CO-reduction studies the nature of active sites was revealed and the relationship between structure and catalytic performance was established. In the systems under study а pronounced synergistic effect of catalytic action of cobalt (or copper) and cerium is observed, associated with the various redox interaction between the metals.