Enhancing SO2 resistance in vanadium catalysts with tungsten disulfide for NH3-SCR

Abstract

NOx emissions are a major environmental issue, and NH3-SCR is a key method for their control. V-based catalysts perform well at high temperatures; however, SO2-poisoning remains a critical issue for NH3-SCR catalysts under low-temperature conditions. In this study, we develop an effective strategy of loading a stable sulfide twodimensional (2D) material, WS2, to enhance the SO2 resistance of existing commercial V/Ti catalysts. In-situ DRIFTS analysis and spent SO2-poisoning catalyst analyses are conducted to clarify the enhanced SO2 resistance mechanism. These findings demonstrate that the superior SO2 resistance can be attributed to the suppression of SO2 by WS2. Therefore, WS2 loading inhibits the SO2 adsorption and protects the NH3 species adsorption, thereby enhancing the SO2 resistance and low-temperature activity. This research can be utilized without changing the catalyst synthesis process, allowing it to be applied to current commercial catalysts, thereby underscoring its remarkable potential for industrial applications.