Oxidative steam reforming of methanol over monometallic gold (Au) and bimetallic Au-copper (Cu) supported on ceria-zirconia (CeO2-ZrO2) was examined over the temperature range of 200-400 degrees C in a fixed-bed reactor. The composition of CeO2-ZrO2 supports was also studied for their catalytic activity. The Au/Ce0.75Zr0.25O2 catalyst exhibited the highest methanol (CH3OH) conversion level (96.7%) and hydrogen (H-2) yield (59.7%) due to the formation of a homogeneous Ce1-xZrxO2 solid solution. When Cu was introduced in the Au catalysts, all of the bimetallic catalysts presented a better stability for CH3OH conversion as well as H-2 yield in comparison to the monometallic catalysts, which was due to the partial electron transfer from Cu to Au metals. The performance of the Au-Cu/Ce0.75Zr0.25O2 catalysts, which was evaluated under identical conditions, was ranked in the order: 3Au1Cu > 1Au3Cu > 1Au1Cu. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.