【摘要】 采用一步水热法制备了不同形貌的CeO₂，通过控制CeO₂的表观形貌实现其表面特定晶面（（200）或（110））的暴露，从而有效调控材料表面Ce³⁺, Ce⁴⁺和活性氧的浓度，提升材料中氧空位的浓度，增强CeO₂的低温可还原性能和表面晶格氧的移动能力。其中，暴露（111）晶面的球状CeO₂具有最快的低温反应速率和最佳的低温催化活性(T₉₀=368℃)，加速1,2-二氯乙烷分子中C-Cl的活化转化，使1,2-二氯乙烷快速转化为碳酸盐和羧酸盐类物质，进而进一步深度氧化并完全转化为CO₂和H₂O等无害物质。更多还原

【Abstract】 Different morphologies of CeO₂ were prepared by a one-step hydrothermal method. By controlling the apparent morphology of CeO₂ to achieve the exposure of its specific crystalline surface（（200） or（110））, the concentration of Ce³⁺, Ce⁴⁺ and reactive oxygen on the material surface was regulated to increase the concentration of oxygen vacancies in the material and enhance the low-temperature reducibility of CeO₂ and the mobility of surface lattice oxygen. Among them, the spherical CeO₂ with exposed（111） crystal surface has the fastest low-temperature reaction rate and the best low-temperature catalytic activity(T₉₀=368 ℃), which can effectively promote the activated conversion of C-Cl in 1,2-dichloroethane molecules, resulting in the rapid combustion of 1,2-dichloroethane to carbonates and carboxylates, and then promote the deep oxidation process of 1,2-dichloroethane.更多还原