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

Jianyu Cai,Zehui Yu,Jian Li

doi:10.3390/catal11070804

Jianyu Cai, Zehui Yu + Show 1 more

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https://doi.org/10.3390/catal11070804

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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.

Highlights

Carbon monoxide (CO) is both a major air pollutant and a potentially valuable resource
Research on supported Pt and other precious metal catalysts is focused on improving the low-temperature catalytic activity by adjusting the particle size of the precious metal particles [12], improving the dispersion of the precious metals on the catalyst support [13], using additives to change the electronic state of the precious metals [14], and adjusting the local structure effect of active sites [15]
°C,their but catalysts did not show catalytic activity at 60at their activity increased with temperature

Summary

Introduction

Carbon monoxide (CO) is both a major air pollutant and a potentially valuable resource. Due to its flammability, explosive limits, and toxicity, CO emissions often cause poisoning and accidental fires [4]. Due to the risks of CO emissions, many countries around the world are increasing the regulation of CO. CO management methods include catalytic oxidation [5,6], adsorption [7], cryogenic separation [8], and co-adsorption [9]. Research on supported Pt and other precious metal catalysts is focused on improving the low-temperature catalytic activity by adjusting the particle size of the precious metal particles [12], improving the dispersion of the precious metals on the catalyst support [13], using additives to change the electronic state of the precious metals [14], and adjusting the local structure effect of active sites [15]

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Conclusion