Insights into the Morphological Effect of Co3O4 Crystallite on Catalytic Oxidation of Vinyl Chloride

Co3O4catalysts of cube and sphere shapes were prepared by one-step hydrothermal synthesis with different controlled amounts of Co(NO3)2·6H2O and NaOH. The morphological effects on both physicochemical properties and catalytic activities of vinyl chloride oxidation were investigated by material characterization and performance evaluation. The obtained results showed that the morphology, resulting in the exposure difference of crystal planes, significantly affected the catalytic property. The catalytic activity for vinyl chloride oxidation followed a descending order of Co3O4cube (Co3O4-c) > Co3O4sphere (Co3O4-s) > Co3O4commercial (Co3O4-com). The cube-shaped Co3O4presented higher catalytic activity and stability than Co3O4spheres despite their similar crystallographic structures as well as physicochemical and redox properties. Accordingly, the different catalytic behaviors should be attributed to a morphological effect. The Co3O4cube with a preferential exposure of (001) plane presented higher abundance of surface Co2+cations and adsorbed oxygen species, which acted as the active sites responsible for the improvement of its catalytic activity.Keywords:Co3O4;morphological effect;crystal plane;catalytic oxidation;vinyl chloride