Study on wet air oxidation of phenol catalyzed by LaFeO3 perovskite
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摘要: 本研究采用固相球磨法制备了四种不同球磨时间的LaFeO3钙钛矿催化材料,并将其用于催化湿式氧化苯酚反应,探讨了球磨时间对LaFeO3钙钛矿催化剂催化湿式氧化苯酚水溶液性能的影响。采用XRD、H2-TPR、TG-DTA、FT-IR、N2物理吸附、XPS等手段对LaFeO3钙钛矿催化材料进行了表征。结果表明,在反应温度为200 ℃、空气压力5 MPa、苯酚初始浓度4000 mg/L时,经过240 min的催化氧化反应后LaFeO3-6催化材料最终的COD去除率为94.5%。Abstract: In this paper, four kinds of LaFeO3 perovskite catalytic materials with different ball milling time were prepared by solid phase milling method and used to catalyze the wet air oxidation of phenol. The effect of milling time on the performance of LaFeO3 perovskite catalyst for wet air oxidation of phenol aqueous solution was investigated. LaFeO3 perovskite catalytic materials were characterized by XRD, H2-TPR, TG-DTA, FT-IR, N2 physical adsorption and XPS. The results show that when the reaction temperature is 200 ℃, the air pressure is 5 MPa and the initial concentration of phenol is 4000 mg/L, the final COD removal rate of LaFeO3-6 catalytic material is 94.5% after catalytic oxidation of 240 min.
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Key words:
- phenol /
- LaFeO3 perovskite /
- catalytic wet air oxidation /
- COD removal rate
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表 1 LaFeO3-t的结构参数表
Table 1 Structural parameters of LaFeO3-t
Catalyst LaFeO3-4 LaFeO3-6 LaFeO3-8 LaFeO3-10 Specific surface area /(m2·g−1) 15.8 18.2 14.7 14.7 Pore volume /(cm3·g−1) 0.10 0.08 0.08 0.09 Average crystallite size /nm 20.7 18.9 20.0 20.9 表 2 LaFeO3-t催化材料的还原峰位置
Table 2 Reduction of LaFeO3-t catalyst
Catalyst Peak temperature t/℃ α peak β peak γ peak LaFeO3-4 371 467 673 LaFeO3-6 333 436 601 LaFeO3-8 351 448 616 LaFeO3-10 353 451 636 表 3 LaFeO3-t催化剂中O 1s XPS曲线拟合
Table 3 O 1s XPS curve-fitting results of LaFeO3-t catalysts
Catalyst Oads/(Oads+OLa-O-CO3+Olatt)(%) LaFeO3-4 37.4 LaFeO3-6 40.6 LaFeO3-8 40.3 LaFeO3-10 39.5 表 4 催化材料的重复使用性
Table 4 Repetition of the catalyst
Reuse time 1 2 3 4 COD removal rate/% 94.5 91.7 88.2 85.8 -
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