TiO2-coated CeCoOx-PVP catalysts derived from Prussian blue analogue for synergistic elimination of NOx and o-DCB: The coupling of redox and acidity.

[Display omitted] • Prussian blue analogue derived CeCoO x -PVP@TiO 2 catalyst is prepared for synergistic elimination of NO x and o -DCB. • The addition of PVP enhances the low-temperature redox properties of the catalysts. • TiO 2 coating enhances the acidity of the catalysts and protects the CeCoO x core. • 90% of NO x conversion and 92% of o -DCB conversion are obtained at 300 ℃. Achieving efficient selective catalytic reduction (SCR) of NO x and catalytic oxidation of dioxins (o-dichlorobenzene as a model) on one catalyst is still a big challenge. In order to balance the N 2 selectivity of SCR and the catalytic oxidation of dioxins, the catalysts with suitable redox properties and acidity need to be designed. Herein, we synthesized Prussian blue analogue (PBA)-derived CeCoO x oxides for the simultaneous removal of NO x and o -DCB by a co-precipitation method. The crystallization rate of PBA was slowed down by the addition of Polyvinylpyrrolidone (PVP), which increased the oxides size, enhanced the crystallinity of oxides and the uniformity of the surface elements distribution. These structural effects enhanced the low-temperature redox performance of the catalysts, and thus improved o -DCB conversion and CO 2 selectivity. Furthermore, the PBA structure was coated by introducing TiO 2 , which improved the amounts of medium-acids and the mobility of oxygen species, thus increasing the mid-and high-temperature SCR performance and N 2 selectivity. In addition, the H 2 O resistance and stability of the catalysts were enhanced due to the protective effect of the TiO 2 coating on the PBA core. The optimized CeCoO x -PVP@TiO 2 catalyst exhibited stable bifunctional removal efficiencies for NO x and o -DCB, with 90% NO x conversion and 92% o -DCB conversion at 300 ℃. The possible reaction mechanisms for NH 3 -SCR and the catalytic oxidation of o -DCB over the CeCoO x -PVP@TiO 2 catalyst were proposed based on in situ DRIFTS experiments. This work provides an efficient strategy to design advanced catalysts for the elimination of dioxins and NO x. [ABSTRACT FROM AUTHOR]