Abstract
A series of mono- and bimetallic copper-cerium catalysts based on ZSM-5 zeolite with different aluminium content (SiO2/Al2O3 = 30 and 55) was synthesised by incipient wetness impregnation. The copper content was 0–4.3 wt %, and cerium loading varied in the range from 0 to 6 wt %. The obtained composites have been investigated by low temperature N2 sorption, XPS, EPR spectroscopy, UV-vis diffuse reflectance spectroscopy, DRIFT spectroscopy of adsorbed CO and tested in the reaction of catalytic oxidation of CO with oxygen. In the systems under study а pronounced synergistic effect of catalytic action of copper and cerium is observed, associated with the redox interaction between the metals. With an increase in the proportion of cerium in bimetallic systems from Сu : Ce = 6 to Сu : Ce = 1, the catalytic activity of the composites grows monotonically. The most active catalysts show 50% CO conversion at temperatures of 90–100°C. Decrease in the aluminium content in the zeolite contributes to higher catalytic activity. It has been shown that Cu+ ions bound to the surface of CeO2 particles play a key role in catalysis.
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