CuCeOx/VMT powder and monolithic catalyst for CO-selective catalytic reduction of NO with CO

Abstract

CO-selective catalytic reduction (CO-SCR) can effectively remove NO_x and CO in flue gas. In this study, a two-dimensional natural mineral vermiculite (VMT) was used as a carrier, and CuCeO_x/VMT was prepared using a coprecipitation-assisted isometric impregnation method. The effects of different calcination environments on the performance of the CuCeO_x/VMT powder catalyst CO-SCR were studied. Additionally, the reaction mechanism of N₂O produced during the reaction of the CuCe/VMT(M) catalyst was discussed for denitrification and removal of nitrogen oxides at low temperatures, and a monolithic-shaped catalyst was prepared. The results showed that CuCe/VMT(M) had an excellent specific surface area of 110.57 m² g⁻¹, abundant oxygen vacancy, and low-temperature CO-SCR performance, which follows the E–R reaction mechanism. At 250 °C, the NO conversion rate could reach 94.5%. The corresponding monolithic-shaped catalyst had a load of 148.2 kg m⁻³. At 250 °C, the GHSV was 2666.6 h⁻¹, and the NO conversion rate could reach 96.8%.