Effect of Cu and Fe Loading on the NH₃-SCR Denitration Performance of Acid-Modified Rare Earth Concentrate Catalysts AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:X701[环境科学与工程—环境工程];TQ426[化学工程]

Citation Information:

The rare earth concentrate was treated by ball milling and sulfuric acid leaching,and then Cu and Fe were loaded on the mineral surface by hydrothermal method to prepare modified rare earth concentrate catalysts.The effects of Cu and Fe mass ratio,roasting temperature and other factors on the performance of the catalyst were studied.By XRD,SEM,EDS,BET,H2-TPR and XPS,the surface morphology,micro-structure,redox ability and element valence distribution of the catalyst were analyzed,and the mechanism of denitration performance improvement was clarified.The results show that the loading of Cu and Fe on the rare earth concentrate catalyst treated by ball milling and acidification modification can effectively im-prove the denitration performance of the catalyst.When the mass ratio of Cu to Fe is 0.75∶1,the NO_x conversion rate of the catalyst is the highest,reaching 96%at the flue gas temperature of 350°C,which is 77 percentage points higher than that of the raw ore.The introduction of Cu species helps to improve the denitration activity of the catalyst in the low temperature stage.After loading Cu and Fe,the relative con-tent of Fe³⁺ on the surface of the catalyst increases,and Fe₂O₃ can act as active sites to improve the deni-tration performance of the catalyst.The relative content of lattice oxygen increases,and the valence change of Ce on the mineral surface is not inhibited,ensuring the conversion of oxygen species.