La2O3掺入对提升CuMnOx/堇青石催化氧化氯苯性能的研究OA

Chlorine-containing volatile organic compounds(Cl-VOCs)pose significant environmental risks and have received considerable attention due to their widespread sources,strong toxicity,difficulty in degradation,and the tendency to produce polychlorinated by-products.Among current treatment methods,catalytic oxidation technology has emerged as the dominant approach for Cl-VOC removal,owing to its advantages such as low ignition temperature,low energy consumption,high efficiency and absence of secondary pollution.In this study,a series of CuMnOx/cordierite catalysts doped with La2O3 were prepared using the citric acid complexation method for the catalytic oxidation of chlorobenzene.The effects of the molar ratio of Cu/Mn,the incorporation amount of La2O3,the loading of CuMnOx and the calcination temperature on the oxidation performance of the catalysts were investigated.The physicochemical properties of the catalyst were characterized by XRD,BET,H2-TPR,O2-TPD,XPS,and in-situ DRIFTs techniques.The results revealed that the addition of La2O3 significantly enhanced the oxidation activity of the catalyst,with performance improving as the doping concentration increased.The temperature of the H2 reduction peak gradually decreased,facilitating O-desorption and promoting the generation of active oxygen.The CuMn3LaOx/cordierite prepared by calcination at 500℃exhibited the highest performance,with T99=300℃.The synergistic effect among CuMn2O4,MnO2 and La2O3,namely the oxygen migration among Cu2+/Cu,Mn4+/Mn3+and La3+/La,was an important reason for the good performance of this catalyst,and the high specific surface area and pore volume of the catalyst further enhancd its oxidation activity.Meanwhile,the repeatability,stability and possible oxidation mechanism of the catalyst were investigated.The catalyst demonstrated good stability throughout testing,with no evidence of catalytic deactivation or poisoning.