SiC-SupportedPolymetallic Oxide Catalysts for EnhancedLow-Temperature SCR Denitration

The increasing need to control NOx emissions from industrial processes and vehicles has driven the development of efficient low-temperature SCR catalysts. In this study, FeCoMnCeSm catalysts were synthesized using an ultrasound-assisted impregnation method and supported on SiC. The resulting FeCoMnCeSm/SiC catalyst exhibited excellent low-temperature denitration performance and superior resistance to H₂O and SO₂ poisoning. The FeCoMnCeSm/SiC catalyst achieved 80% NO conversion at 80 °C and full conversion in the 100–200 °C range. Comprehensive characterization of the catalysts using XRD, BET, XPS, H₂-TPR, and NH₃-TPD revealed that the SiC-supported catalyst had higher porosity and a greater number of surface acidic sites, leading to improved oxygen chemisorption, NH₃/NO adsorption, and enhanced redox properties. The catalyst also maintained a stable number of acidic sites after SO₂ exposure, underscoring its durability in harsh industrial environments. These findings highlight the potential of FeCoMnCeSm/SiC as a highly efficient and robust catalyst for low-temperature SCR applications.