Dispersing CuSO4 on TiO2 support for efficient simultaneous removal of NO and CO from flue gas

The technology of simultaneous ammonia selective catalytic reduction (NH 3 -SCR) denitration and carbon monoxide (CO) oxidation is a proposed approach for synergistic purification of nitrogen oxides (NO x ) and CO from flue gas. However, the lack of highly efficient catalysts has hindered the widespread adoption and application of this technology. Herein, a series of CuSO 4 /TiO 2 (denoted CuS/Ti-X, X means calcination temperature at 400, 500, and 600 °C) catalysts was prepared to investigate their performance for simultaneous NH 3 -SCR denitration and CO oxidation. The results show that dispersing CuSO 4 on TiO 2 carrier induces the formation of surface Cu-O defect structure and reduces the stability of the Cu-O-S structure, which gives CuS/Ti-X catalysts a good redox property. Hence, the CuS/Ti-500 catalyst exhibits good catalytic activity in simultaneous removal of NO and CO, even in the presence of SO 2 . Reaction process investigation demonstrated that the presence of NO and NH 3 inhibits the adsorption of CO and consumes active oxygen species, thereby suppressing the CO oxidation reaction. In contrast, CO can promote the activation of NH 3 via activating the redox sites, which is conducive to the NH 3 -SCR reaction via the E-R mechanism. This study provides new insights into the strategic design of dual-functional sulfur-resistant catalysts for flue gas purification.