PROCEEDINGS of the 28th Ibero-American Catalysis Congress

Cobalt-manganese mixed oxides supported on three-dimensional macro-mesoporous ordered alumina (CoMnOx/3DOM-Al2O3) were synthesized and characterized to evaluate their catalytic activity in the oxidation of toluene, a model molecule of volatile organic compounds. The 3DOM-alumina support was prepared by employing PMMA microspheres as hard template and F-127 as soft template. While Co-M oxide was supported to alumina (3DOM-Al2O}), by incipient wet impregnation method. By XRD, and Raman spectroscopy methods, the incorporation of manganese into the spinel structure of cobalt oxide was evidenced. The size of the PMMA microspheres (294 nm) was determined by SEM and the size of the macropores (~180 nm) and mesopores (~ 9 nm) of the alumina was determined by TEM. In addition, the conservation of macropores and mesopores was evidenced after impregnating the alumina. The tests (H2-TPR) indicate a decrease in the reduction temperatures with the incorporation of manganese. This suggests an improvement in the redox properties, due to the incorporation of Mn, which could be reflected in a decrease in the oxidation temperature of toluene. Additionally, the XPS results show the presence of cobalt, manganese, aluminum and 3 species of oxygens.