Noble metal nanomaterials have attracted mounting research attention for applications in diverse fields of catalysis, biology, and nanotechnology. In the present study, we have undertaken a detailed investigation on synthesis, characterization, and catalytic activity studies for CO oxidation by nanogold catalysts supported over CeO 2 and CeO 2 -ZrO 2 (1 : 1 mole ratio). The support systems were prepared by modified, simple precipitation technique and the Au supported samples were synthesized using depositionprecipitation with urea method. The physicochemical characterization was performed by XRD, ICP-AES, BET surface area, FT-IR, UV-Vis DRS, Raman Spectroscopy, TEM, and XPS techniques. Au/CeO 2 catalyst showed more than 80% CO conversions at 30 ∘ C, whereas Au/CeO 2 -ZrO 2 exhibited ∼100% CO conversion at that temperature. The catalytic performance of Au catalysts is highly dependent on the nature of the support.
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