Synthesis and characterization of Co-Fe nanoparticles supported on mesoporous silicas

► Co-Fe samples supported on both SBA-15 and HMS mesoporous silicas were obtained. ► Co-Fe/HMS and Co-Fe/SBA-15 samples presented Co3O4 (cubic) and CoFe2O4 (cubic) phases. ► Co is lesser reduced than Fe in bimetallic samples. ► Co-Fe/HMS and Co-Fe/SBA-15 presented great mechanical stability. ► Bimetallic samples revealed smaller particles than the monometallic ones.