Review of Researches on SCR Catalyst with Low Temperature and high Sulfur Tolerance and Theoretical Design

School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

Abstract

Selective catalytic reduction (SCR) of nitrogen oxides (NO_x) using ammonia (NH₃) is currently the main technology for flue gas denitration. However, the currently widely used commercial catalysts (such as V₂O₅-WO₃ / TiO₂, V₂O₅-MoO₃ / TiO₂, etc.) have the disadvantages of high operating temperature, narrow active temperature window, and high catalytic cost. Therefore, in recent years, researchers have devoted themselves to the development of low-cost and efficient low-temperature SCR catalytic materials. This paper summarizes the research progress of low-temperature (less than 250 °C) selective catalytic reduction of NO_x by unsupported metal oxide catalysts, supported metal oxide catalysts, precious metals, and molecular sieve catalysts. Among them, manganese-based catalysts show good low-temperature selectivity and stability, and have good application prospects. Finally, the research directions of manganese low temperature SCR catalysts are prospected and theoretically designed based on the existing problems.