Effect of Ce Loading on the Reduction of NOx with NH3 over Fe-Beta Catalyst

Abstract

Fe-Beta catalysts play a significant part in denitration performance for NH₃- SCR, and this paper focuses on the effect of Fe-Beta catalysts with different Ce loading on the conversion of NO_x.After the catalyst has been prepared by the impregnation method, the catalyst active component has been tested by passing within reaction gas and the gas component concentration at the outlet end was measured by FTIR. It was found that a proper loading of Ce can enhance the conversion rate of NO_x of the catalyst for improving its low temperature activity. And NO conversion over Ce-Fe-Beta catalyst could reach 100%. The catalyst performance was evaluated with XRD, BET, XPS, NH₃-TPD, H₂-TPR. It could be analyzed that the Fe-Beta performance of NO_x removal decreased when the Ce loading was too high because the catalyst active sites were covered by active component, which reduced the catalyst activity.