Effect of Combined Mn-Fe Loading and Sulphuric Acid Acidification on NH₃-SCR Denitration Performance of Synthetic(Ce,La)CO₃F AITranslate

2宋忠贤,张秋林,宁平,刘昕,樊洁,黄真真.Introduction manner of sulfate acid for improving the performance of SO_4^(2–)/CeO_2 on selective catalytic reduction of NO by NH_3[J].稀土学报：英文版,2016,34(7):667-674. 被引量：8

7Wenjie Zhang,Dongxia Feng,Xian Xie,Xiong Tong,Yunpeng Du,Yang Cao.Solvent extraction and separation of light rare earths from chloride media using HDEHP-P350 system[J].稀土学报：英文版,2022,40(2):328-337. 被引量：2

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Chinese Library Classification Number:TQ426[化学工程]

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Bayan Obo bastnaesite was selected as the research object,and according to its Ce/La mass ratio,(Ce,La)CO₃F crystal grains were synthesized by hydrothermal method to study their NH₃-SCR denitration performance.The results show that(Ce,La)CO₃F synthesized by adding excess NaHCO₃has better catalytic effect.After roasted at 500℃,the(Ce,La)CO₃F grains have the best denitration effect,and the NO_x conversion rate is 34%at the catalytic reaction temperature of 200℃.The combined action of Mn-Fe loading and sulfuric acid acidification can excite the active components of(Ce,La)CO₃F catalyst.After the catalyst with the combined action is roasted at 400℃,the NO_x conversion rate of 93%is obtained at the catalytic reaction temperature of 250℃.The reaction mechanism of(Ce,La)CO₃F catalyst was explored by in-situ infrared technology.The results show that the surface reaction of Mn-Fe loaded and sulfuric acid acidified(Ce,La)CO₃F catalyst mainly follows the E-R mechanism.The reactive species are NH⁺₄/NH₃(a)generated by NH₃(g)adsorption on the catalyst surface and NO,which undergo a series of intermediate reactions to produce N₂ and H₂O.This study can provide theoretical guidance for the use of rare earth concentrates as denitration catalysts.