Design and performance optimization of a bifunctional catalyst in sintering flue gas denitrification reactor
WANG Jiaqing
LAI Zhiqiang
LI Xinqiang
WANG Yan
JIAO Yang
SU Wei
CHEN Lijuan
Abstract：Under the dual background of"ultra-low emission"and"double carbon",the iron and steel industry has put forward a new process to reduce pollution and carbon emissions in the treatment of sintering flue gas.The existing SCR denitrification reactor can be used to achieve catalytic synergistic removal of NOx and CO,but currently lacks efficient,stable,and adaptable dual-function catalysts for flue gas treatment.A series of m％CuCeOx/γ-Al2O3catalysts were designed by ultrasound-assisted isovolumetric impregnation method using γ-Al2O3 as the carrier and Cu-Ce composite oxides as the active component.The best performing catalysts were screened by optimization of loading and Cu:Ce molar ratio,and the NOx conversion was higher than 75％and CO conversion was higher than 99％at 200℃.The nature of Cu-Ce oxide loading on catalyst performance enhancement has been explored through various characterizations.On the one hand,Cu doping into the CeO2 lattice strengthens the interaction between Cu and Ce,resulting in the formation of richer oxygen vacancies in the composite oxide,which promotes the NOx reduction and CO oxidation reaction rates.On the other hand,Cu-Ce loading enhanced the number and strength of low-temperature acidic sites of the catalyst,which enhanced the SCR denitrification performance by promoting NH3 adsorption at low temperature.This study verified the feasibility of synergistic catalytic removal of NOx and CO from sintered flue gas and provided a new idea for the design of bifunctional catalysts.
Keywords：sintering flue gasdenitrification reactorbifunctional catalystisovolumetric impregnationper-formance optimization
Publication Date：2025-11-20
Online Publishing Date：2026-01-06(First online date of this platform, not the publication date of the document)
Pages：6( 69-74 )