Preparation and characterization of Co-Fe-Cu mixed oxides via hydrotalcite-like precursors for toluene catalytic oxidation

摘要

Different Co_(2-x)Cu_xFe_1 hydrotalcites with x = 0, 0.5, 1, 1.5 and 2 have been synthesized in order to be used as precursors of mixed oxides for total toluene oxidation. The formation of hydrotalcite phase has been evidenced for x < 1 and its decomposition at 500°C led to Co_3O_4 and/or CoFe_2O_4 spinels. At 500°C, besides the Co-Fe spinels, CuO formation has been related for x ≥1. The presence of CuO phase was not the determining parameter since a catalytic synergetic effect has been obtained for Co_(1.5)Cu_(0.5)Fe_1 sample.