Abstract
The various wt% of Cs promoted CuOx/CeO2−δ catalysts were prepared by impregnation method and examined for CO oxidation. The 0.1 wt% Cs doped CuOx/CeO2−δ showed a maximum CO oxidation (22%) compared to the CuOx/CeO2−δ (9%) at light off temperature (40 oC). The plausible CO oxidation mechanism has explained using characterization techniques like ATR-FTIR, XPS, XRD, SEM, H2-TPR, and HRTEM. The formation of Cs2O was responsible for the stabilization of Cu1+ species. The Cs doping increases the electron density on the catalyst surface due to the charge diffusion. The Cs addition in CuCe leads to the formation of smaller Cu1+ species, CuO nanorod, Ce3+ and adsorbed oxygen. The role of these species for CO oxidation at a lower temperature is explained in detail with plausible mechanism. The synergistic interaction of Cs with CuCe leads to the increase in CO conversion rate with decrease in the activation energy.
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