Abstract:
The catalytic activity of bimetallic Au-Cu/CeO2-ZrO2 catalysts was studied for oxidative steam reforming of methanol (OSRM). Various variables, such as support composition (Ce/(Ce+Zr) atomic ratio), support preparation, Au/Cu atomic ratio, total metal loading, and calcination temperature were investigated. The catalysts were characterized by using Brunauer-Emmett-Teller (BET) surface area measurement, X-ray diffraction (XRD), temperature-programmed reduction (TPR), atomic absorption spectroscopy (AAS), FT-Raman spectroscopy, UV-visible, and temperature-programmed oxidation (TPO). Catalytic activity of the prepared catalysts was investigated under atmospheric pressure at a reaction temperature ranging from 200 ℃ to 400 ℃. The 5 wt% 3AulCu/Ce0.75Zr0.25O2 calcined at 300℃ exhibited the highest catalytic activity with 99.6% methanol conversion and 62.4% hydrogen yield. Moreover, the 5 wt% 3AulCu/ Ce0.75Zr0.25O2 showed stable catalytic performance at 350 ℃ for 21 h. This may be related to the Au-Cu alloy structure, as confirmed by XRD patterns.
