Performance of honeycomb ceramic alumina supported Fe-Cr composite catalyst in the flue gas DeNOx by selective catalytic reduction with CO

Using CO for the selective catalytic reduction (CO-SCR) of NO_x can significantly reduce the De-NO_x cost of boiler flue gas treatment. In this work, the catalytic performance of honeycomb ceramic alumina supported Fe-Cr composite (Fe-Cr/HCA) in the flue gas DeNO_x by CO-SCR was investigated at high temperature and the catalyst preparation parameters like the bimetallic ratio, aging temperature and metal loading amount were optimized. The results indicate that a solid solution of FeCr₂O₄ is formed on the Fe-Cr/HCA catalyst surface and the synergy between Fe₂O₃ and Cr₂O₃ greatly promote the De-NO_x efficiency by CO-SCR. In particular, the Fe-Cr/HCA catalyst, prepared with a Fe/Cr ratio of 1, aging temperature of 300 °C and impregnation for 15 times, exhibits excellent performance in the CO-SCR of NO, where the NO conversion approaches 100% at 400–800 °C under the tested conditions. Additionally, the catalyst impregnated six times can be utilized in practical applications.