In order to improve the CO catalytic oxidation performance of a Pt/TiO2 catalyst, a series of Pt/TiO2 catalysts were prepared via an impregnation method in this study, and various characterization methods were used to explore the effect of TiO2 calcination pretreatment on the CO catalytic oxidation performance of the catalysts. The results revealed that Pt/TiO2 (700 °C) prepared by TiO2 after calcination pretreatment at 700 °C exhibits a superior CO oxidation activity at low temperatures. After calcination pretreatment, the catalyst exhibited a suitable specific surface area and pore structure, which is beneficial to the diffusion of reactants and reaction products. At the same time, the proportion of adsorbed oxygen on the catalyst surface was increased, which promoted the oxidation of CO. After calcination pretreatment, the adsorption capacity of the catalyst for CO and CO2 decreased, which was beneficial for the simultaneous inhibition of the CO self-poisoning of Pt sites. In addition, the Pt species exhibited a higher degree of dispersion and a smaller particle size, thereby increasing the CO oxidation activity of the Pt/TiO2 (700 °C) catalyst.

A series of Pt/TiO2 catalysts were prepared by the impregnation (IM), dry ball mill (DB), or wet ball mill (WB) methods, and their catalytic activity for the oxidation of CO was evaluated. The structure and redox properties of the catalysts were investigated by N2 desorption, XRD, SEM, TEM, XPS, H2-TPR, SO2-TPD, and CO chemisorption analysis. It was determined that the preparation method affects the physical structure of the catalyst and the particle size and dispersion of Pt on the catalyst surface. The catalyst prepared by the impregnation method had a more suitable physical structure than the other catalysts, with a smaller particle size, a higher dispersion of Pt on the surface, and the lowest strength of SO2 adsorption. Pt/TiO2(IM) catalysts presented the best catalytic activity for the oxidation of CO in simulated sintering flue gas at 140 °C, as well as better sulfur and water resistance with simulated sintering flue gas containing 50 ppm of SO2 and 15% water vapor.

In this study, carbon monoxide catalytic oxidant MoSnCoOx was prepared by coprecipitating method to investigate the effect of MoO3 addition amount on catalyst activity. Meanwhile, the sulfur and water resistance of the catalysts were researched by simulating the industrial conditions of sintering smoke emission. The samples were studied using BET, XRD, SEM and H2-TPR techniques. The results revealed that catalyst added with 0.5% MoO3 had better activity than the original Sn9Co91O2 catalyst and its efficiency reached 98.04% at 70 °C. After 21 h reaction with sulfur and water in the flue gas, the catalyst efficiency only decreased to 89.75%. According to the results of characterization, Mo0.5Sn9Co90.5O2 catalyst could better resist sulfur and water, because the presence of MoO3 not only reduced the crystallinity of the catalyst, but it also increases the specific surface area and oxidation capacity.

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.