Atjayutpokin T.Eaimsumang S.Smith S.M.Boonyuen S.Luengnaruemitchai A.Mahidol University2023-06-182023-06-182022-12-01Materials Today Communications Vol.33 (2022)https://repository.li.mahidol.ac.th/handle/20.500.14594/85068Gold (Au) nanoparticles (NPs) and Au-copper (ii) oxide (CuO) supported on titania (TiO2) catalysts prepared by deposition-precipitation were investigated for the oxidative steam reforming of methanol (OSRM) and CO oxidation reactions. The effect of sodium borohydride (NaBH4) as a reducing agent during the Au catalyst preparation was studied. Characterization by high-resolution transmission electron microscopy established that an optimal NaBH4 quantity provided small Au NPs of less than 5 nm diameter with a uniform distribution that exhibited a higher catalytic activity than the others in the OSRM. The Au-CuO catalysts formed with different metal atomic ratios were also synthesized and compared for their catalytic activities in the OSRM and CO oxidation reactions with those from Au/TiO2 and Cu/TiO2. All Au-CuO catalysts achieved the highest methanol conversion at 400 °C, whereas the monometallic Au provided an almost five-fold higher catalytic CO oxidation activity due to the possession of smaller particles than in the other catalysts.Materials ScienceArticleSCOPUS10.1016/j.mtcomm.2022.1050192-s2.0-8514270246723524928