Synergistic Coupling of the Redox Properties of Supports and Cobalt Oxide Co 3 O 4 for the Complete Oxidation of Volatile Organic Compounds

Cobalt catalysts supported on metal oxides (CeO 2 , TiO 2 and Al 2 O 3 ) were prepared to investigate the effects of the support for the complete oxidation of propene, a model volatile organic compound of hydrocarbon type. The presence of ethylenediamine during the preparation of Co/metal oxides was also studied and compared with a conventionally prepared catalyst. Addition of an aqueous solution of ethylenediamine to a cobalt nitrate solution had a promotional effect on the catalytic performance of the solids. More activated oxygen species are available for propene oxidation due to the highest cobalt dispersion obtained when ethylenediamine is used during the synthesis. But the activation of oxygen species and the reducibility of the catalyst depend on the support used. The Co/CeO 2 catalysts, synthesized by two protocols, presented the highest propene oxidation activity from the series due to the highest synergistic coupling of the redox properties of CeO 2 and Co 3 O 4 . Graphical Abstract