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Contributions of Support Effect to Impregnated Cobalt CeO2 and SiO2 Catalysts

Supported transition metal oxides catalysts with high catalytic activity have gained great attention. Despite noble metal catalysts present superior low temperature activities, their manufacturing cost is also higher and they are easy to be deactivated. Among the various transition metal oxides, cobalt oxide (Co3O4) has shown promising activity for CO oxidation, decomposition of N2O and methanol steam reforming [1]. For most heterogeneous catalysts, supporting material plays a critical role on the catalyst activity, however, the underlying mechanism seems only preliminary. It was found that the cobalt oxides supported on the reducible metal oxides, such as TiO2 and CeO2, exhibited higher synergism and promoted catalytic activity compared with those supported on the irreducible metal oxides, like SiO2. In this study, a comparative investigation was conducted between Co3O4 impregnated on ceria (CeO2) nanorods and silica (SiO2) nanospheres support to understand the effect of support reducibility and surface defects, and the metal oxide/support interactions during redox cycling.