Effect of Porogen on Acid-Activated Rare Earth Tailings-Based Molded NH₃-SCR Denitration Catalyst AITranslate

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Chinese Library Classification Number:TQ426.98[化学工程]

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To enhance the denitration performance of acid-activated molded NH₃-SCR denitration catalysts,using rare earth tailings as raw materials,various porogens(starch,polyethylene glycol,ammonium carbonate,activated carbon)were added to the sulfuric acid-activated and microwave-treated powdered catalyst,and then NH₃-SCR denitration catalysts were prepared by extrusion molding.The effects of different types and dosages of porogens on the denitration activity,compressive strength,specific surface area,pore structure,phase composition,and redox capacity of the catalysts were investigated using NH₃-SCR tests,Xray diffraction,specific surface area measurement,and H₂ temperature-programmed reduction.The optimal type and dosage of porogen were determined accordingly.The results show that adding 5.0%by mass of polyethylene glycol results in the relatively optimal denitration performance of the molded catalyst,which exhibits a specific surface area of 3.70 m²/g,a total pore volume of 0.0308 cm³/g,and a denitration efficiency of 74.0%at 350℃.It also demonstrates high N₂ selectivity,compressive strength,and redox capacity.Compared to the catalyst without any porogen,the denitration performance is significantly improved.