负载型复合氧化物催化剂催化燃烧氯苯性能研究

A series of supported Mn-Ce-Zr composite oxide catalysts are prepared by sedimentation-precipitation method to investigate the effects of support, molar ratio and load on the performance of catalytic combustion of chlorobenzene. The physical and chemical properties of the catalysts are characterized by X-ray diffraction (XRD), Brunner-Emmet-Teller (BET) measurements, hydrogen temperature-programmed reduction (H₂-TPR) and scanning electron microscope (SEM). The results show that the catalyst with cordierite honeycomb ceramic as the support, the molar ratio of manganese-ceria-zirconium at 4:1:1 and the loading capacity at 30%wt show the optimal catalytic oxidation performance, and the conversion rate of chlorobenzene at 325 ℃ can reach 99%. It is found that this is closely related to the excellent REDOX performance of the catalyst and the homogeneous distribution of the active components on the support. In addition, a preliminary comparative study on the catalytic combustion performance of the catalysts on CVOCs with different structural properties is also carried out.