Nb改性铈基催化剂脱硝协同氯苯脱除实验研究
Experimental study on Nb-modified cerium-based catalyst for collaborative removal of NOx and chlorobenzene
Based on cerium-based catalysts,experimental research is conducted on composite multi-component metal oxides catalysts for collaborative removal of NOx and chlorobenzene.Results show that the CeMn system catalysts added with manganese oxides present a significant advantage in low-temperature catalytic oxidation.Furthermore,the doping of niobium oxides can significantly enhance the performance of the CeMn catalyst for collaborative removal of NOx and chlorobenzene.The CeMnNb catalyst with a Ce/Nb molar ratio of 2 achieves a removal rate of 97.2% for chlorobenzene and a removal rate of 88.3% for NOx at 280℃.Characterization analysis results reveal that the addition of Nb element increases the specific surface area of CeMnNb catalyst significantly to 97.729 m2/g while makes its total pore volume reach 0.258 8 cm3/g.After doping modification,the catalyst’s surface pore structure is optimized,MnNb2O6 solid solution is constructed successfully,and the number of weak/strong acid sites and oxygen-containing functional groups increases simultaneously,resulting in the optimal low-temperature oxidation performance.
氮氧化物 / 协同脱除 / 催化剂 / 复合金属氧化物 / 氯苯
nitrogen oxides / collaborative removal / catalyst / composite metal oxides / chlorobenzene
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国家重点研发计划(2022YFB4100301)
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