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

Abstract

NO_x 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 two-dimensional (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.