关键词: cobalt catalysts , carrier porosity , catalysis property , calcination temperature , oxidation of carbon monoxide , cobalt catalysts, carrier porosity, catalysis property, calcination temperature, oxidation of carbon monoxide

Abstract: Abstract The catalysis properties of cobalt oxide catalysts supported on three silica carrier with different pore size (7.7 nm, 14.0 nm, and 27.0 nm) were investigated. The samples were prepared by incipient wetness impregnation. The effects of calcination temperature on the catalyst surface properties, catalyst micro structure properties and catalytic performance for the oxidation of carbon monoxide were also studied. Catalysts were characterized by nitrogen adsorption, XRD, XPS, FTIR, H2-TPR and O2-TPD. The properties and diameter of cobalt species strongly depended on the pore size of silica carrier. While the silica pore size increased from 7.7 nm to 27.0 nm, the Co3O4 crystal size increased from 8.5 nm to 13.5 nm. A new discovery was found that the Co3O4 spinel crystal structure was obtained at a low calcination temperature (150 ℃) with a higher Co3O4 surface dispersion and more amounts of surface active species which led to a higher activity for the oxidation of carbon monoxide.