Abstract
Nanocrystalline materials are associated with high surface area and reactivity. Gas condensation techniques have been developed to synthesize such systems with a unique control of stoichiometry and dispersion. The high concentrations of oxygen vacancies and surface adsorbed species in nanocrystalline CeO 2− x were found to greatly enhance catalytic activity in SO 2 reduction and CO oxidation. By having an ultrahigh dispersion of Cu on nanocrystalline CeO 2− x , we have further demonstrated the possibility of tailoring intimate synergistic effects between different components in a nanocomposite material. The resulting supported base metal system has an unusually high thermal stability and could selectively catalyze SO 2 reduction and CO oxidation at significantly lower temperatures (420 °C and 80 °C, respectively). The high redox activity of the nanocrystalline CeO 2− x -based system is tied to the microstructure, surface chemistry, and electrical conductivity of this advanced catalyst.
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