Application Research on Pd-Co-Ti Catalyst for Purifying CO in Flue Gas of Hot-blast Stove in Steel Rolling Mill

The Pd-Co-Ti catalyst was successfully prepared by the method of impregnation-precipitation-ball milling. The structure and redox properties of Pd-Co-Ti catalyst was investigated by N22 desorption, X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and H22-TPR. The results show that the Pd-Co-Ti catalyst has a large specific surface area and a rich pore structure, and there are Co33O44 and anatase TiO22 crystals in the catalyst. The synergistic effect of Pd and Co improves the redox ability of Pd-Co-Ti catalyst. The catalyst is used to treat CO in the flue gas of rolling mills. It runs for 168 hours at a space velocity of 30,000 cm33/(g⋅⋅h) and a temperature of 280∘∘C, and the CO removal rate is basically maintained at more than 90%. The ratio of inlet CO content and O22 content affects the catalyst CO removal efficiency. When the ratio is greater than 0.5, the CO removal efficiency has a downward trend. The results of this study are of great significance to the practical application of CO oxidation technology.