Mn-Ce-Co复合氧化物催化剂的制备及其催化燃烧氯苯性能研究

A series of Mn-Ce-Co composite oxide catalysts with different Mn contents were prepared by sol-gel method. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Brunauer Emmett Teller(BET), hydrogen temperature programmed reduction (H₂-TPR) and X-ray photoelectron spectroscopy (XPS). The effect of Mn content and calcination temperature on the catalytic performance of the catalyst for the combustion of chlorobenzene was investigated. The results show that the addition of proper amount of Mn promotes the entry of Co into the CeO₂ cubic fluorite structure to form a Mn-Ce-Co-O ternary solid solution, which increases the specific surface area of the catalyst and the surface active oxygen species, thereby enhancing the oxidizing ability of the catalyst. In addition, a suitable calcination temperature causes the catalyst to change to an amorphous state, further increasing the specific surface area of the catalyst and the dispersion of the active component, thereby increasing the activity of the catalyst.