Effect of Preparation Methods on the Performance of Pt/TiO2 Catalysts for the Catalytic Oxidation of Carbon Monoxide in Simulated Sintering Flue Gas

Abstract

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.

Weak Metal–Support Interaction over CuO/TiO2 Catalyst Governed Low-Temperature Toluene Oxidation

“…However, the H 2 uptake toward α peak over CuO/TiO 2 (imp) (0.8 μmol·g −1 ) is remarkably higher than that over CuO-TiO 2 (coll) (0.16 μmol·g −1 ). This finding indicates plentiful reducible oxygen species [ 56 , 57 ] associated with abundant well-dispersed CuO species in the former sample, which contributes to its superior catalytic performance. In addition, the β peak temperature of CuO/TiO 2 (imp) is 11 °C lower than that of CuO-TiO 2 (coll), which also indicates that the interaction between CuO and TiO 2 in the CuO/TiO 2 (imp) is weak, making oxygen species easier to reduce.…”

“…In addition, two reduction peaks over 300 °C are correlated with TiO 2 , which are denoted by δ and ε, respectively. According to the literatures [ 50 , 55 , 56 ], they could correspond to the reduction in lattice oxygen species of TiO 2 .…”

Effect of TiO2 Calcination Pretreatment on the Performance of Pt/TiO2 Catalyst for CO Oxidation

“…The further improvement in the low-temperature activity of precious metal catalysts, enhancement of catalyst stability, and reduction in the amount of precious metal are imperative to promoting practical applications of precious metal catalysts. Since the study on Pt-catalyzed CO oxidation by Langmuir [12], several researchers have conducted research on Pt catalysts [13][14][15][16][17][18].…”