CuW/CeZr Catalysts: A Dual-Function Catalyst for Selective Catalytic Reduction of NO and CO Oxidation Under Oxygen-Rich Conditions

Abstract

In this study, a series of CuW/CeZr (denoted as xCu–yW–CZ hereafter) catalysts with both NO reduction and CO oxidation activity was synthesized by the co-impregnation method, aiming for simultaneous removal of NO and CO under oxygen-rich conditions. Characterizations including N2 adsorption and desorption, XRD, SEM, H2–TPR, and NH3–TPD were used to interpret the influence of WO3/CuO loading amount on catalytic activity. The results suggested that the addition of WO3 species increased the surface acidity of the catalyst while weakening its redox property. On the contrary, the addition of CuO species greatly enhanced the redox property of the catalyst while hardly changing its surface acidity. Notably, too high content CuO was prone to aggregate, which was unfavorable to catalytic activity. Consequently, 5Cu–10W–CZ with 5 wt% CuO and 10 wt% WO3 presented the most optimal catalytic activity because of high components dispersion, appropriate redox property, and surface acidity. A novel dual-function catalyst (CuW/CeO2–ZrO2) that can simultaneously catalyze NH3–SCR reaction and CO oxidation reaction, was synthesized by the co-impregnation method, aiming for simultaneous removal of NO and CO under oxygen-rich conditions.