Co-Mn oxides supported on hierarchical macro-mesoporous silica for CO and VOCs oxidation

The hierarchical macro-mesoporous silica (MMS) was used for a first time as support catalysts oxidation reactions. synthesized by the emulsions templating mechanism and modified separately or simultaneously using cobalt manganese oxides. obtained materials were characterized different physicochemical methods tested in of CO n-hexane combustion modification MMS does not change significantly mesopores characteristics; however, its pores are partially blocked For Co-MM sample agglomerates consisting Co3O4 with average size 100?150 nm small spherical aggregates, encapsulated formed. amorphous oxide preferentially fills up Mn-MM sample. Mixed Co-Mn phases situated mesoporous network formed bi-component samples. No significant is observed either texture, structural features after reaction. highest catalytic activity related to predomination Co3+ species on surface more accessible particles located outside mesopores. encapsulation mixed oxides responsible lower comparison that mono-component