Xuan Dien, LuongLuongXuan DienMurayama, ToruToruMurayamaTUAN HUNG NGUYENDuc Truong, QuangQuangDuc TruongDang Chinh, HuynhHuynhDang ChinhYoshimura, MashamichiMashamichiYoshimuraHaruta, MasatakeMasatakeHarutaIshida, TamaoTamaoIshida2025-09-242025-09-242022https://www.scopus.com/inward/record.uri?eid=2-s2.0-85126979078&doi=10.1016%2Fj.jcat.2022.03.008&partnerID=40&md5=5414d1f75bb45d80bedfb8d000b0bb40https://scholars.lib.ntu.edu.tw/handle/123456789/732306Gold nanoparticles supported on titania (Au/TiO<inf>2</inf>) catalysts were prepared by solid grinding (SG) method using a halide-free nonvolatile organogold complex, bis(phenyl)boroxinato(4-tolylpyridyl)gold(III), abbreviated as AuBO, followed by calcination. Density functional theory (DFT) calculation revealed that AuBO was adsorbed on TiO<inf>2</inf> by hydrogen bonding with the surface hydroxy group of TiO<inf>2</inf> and that the adsorption energy was lower than those of other gold precursors. The obtained catalyst (AuBO/TiO<inf>2</inf>) showed higher catalytic activity for CO oxidation than did Au/TiO<inf>2</inf> prepared by conventional deposition–precipitation method and by SG using other organogold complexes. Furthermore, grinding of the gold precursor with potassium tert-butoxide followed by calcination (AuBO/K-TiO<inf>2</inf>) improved the catalytic activity and 100% CO conversion reached at ? 23 °C (temperature at which 50% CO conversion occurs, T<inf>1/2</inf> = ? 39 °C) as compared to AuBO/TiO<inf>2</inf> (T<inf>1/2</inf> = ? 28 °C). Potassium tert-butoxide facilitated the decomposition of AuBO adsorbed on TiO<inf>2</inf>, and increased surface basicity contributed to the improved catalytic activity. AuBO/K-TiO<inf>2</inf> also exhibited high catalyst stability for CO oxidation at room temperature.Co OxidationGold ClustersGold NanoparticlesSolid GrindingCalcinationCatalyst ActivityCatalyst SupportsCatalytic OxidationDensity Functional TheoryFiber Optic SensorsGold CompoundsGrinding (machining)Hydrogen BondsMetal NanoparticlesPotassium CompoundsPrecipitation (chemical)Titanium DioxideAu/tio 2Co ConversionCo OxidationGold ClustersGold PrecursorNonvolatileOrganogold ComplexesPotassium Tert-butoxideSolid Grinding]+ CatalystGold Nanoparticlesjournal article10.1016/j.jcat.2022.03.0082-s2.0-85126979078