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We have found that physical mixing (solid grinding, SG) of dimethylgold(III) acetylacetonate (Me₂Au(acac)) adsorbed on SiO₂ with potassium t-butoxide (KO^tBu) significantly improved the catalytic activity for CO oxidation at low temperature, and T_1/2 (the temperature at 50% CO conversion) became extremely low such as −43 °C. We have also developed an alternative Au complex for SG, and 2-(p-tolyl)pyridinebis(trifluoroacetate)gold(III) (AuTFA) could be adsorbed on metal oxide (MO_x) supports by physical mixing of AuTFA with MO_x in air at room temperature for 20 min, and small Au nanoparticles (NPs) were deposited after calcination. The sizes of Au NPs were almost the same as those prepared using Me₂Au(acac) and smaller than those prepared by DP for Al₂O₃ and TiO₂ supports. In addition, grinding AuTFA adsorbed on SiO₂ with KO^tBu was also effective for reducing the size of Au particles and gave Au …