Preparation and Characterization of Au Supported MO_x-Al2O3 (M = Mn, Cu) Powders for Low-Temperature CO O_xidation

摘要

MO_x-Al2O3 (M = Mn, Cu) powders were synthesized by the spray pyrolysis process and then used as a support for Au/(Mn,Cu) O_x-Al2O3 catalysts preparation via the deposition-precipitation method. Gold catalysts on oxide supports were tested for oxidation of CO. The samples were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), and via determination of specific surface area by the BET method. The SEM results showed that all catalysts have a small-dimension circular shape of particles. Catalysts obtained with the spray-pyrolysis method were found to have great specific surface areas. Gold catalyst containing copper oxide on alumina is shown to be more active than manganese oxide on the same support.