【摘要】 近年来,氧化铈（CeO₂）形貌控制合成的研究已成为稀土研究的重要组成部分。采用溶菌酶为模板,硝酸铈作为铈源,碳酸钾为沉淀剂,使用简单的水热反应和热处理制备了具有三维船形形貌的CeO₂材料对制备的CeO₂材料进行XRD、SEM、TEM和N₂吸附等的结构表征,结果表明,船形氧化铈为椭圆结构,整个三维结构由许多CeO₂晶粒组装堆积而成,晶粒尺寸为（8～10）nm,比表面积为32.2 m²·g^-1。并在CeO₂上进行CO催化氧化模型反应研究,考察了该材料在CO催化氧化中的应用,发现船形CeO₂的CO催化氧化起燃温度T₅₀和完全转化温度T₁₀₀分别为230℃和250℃,具有较高的CO催化氧化活性。更多还原

【Abstract】 Synthesis of CeO₂ with controllable morphology has attracted much attention and become an important part of rare-earth researches.In this paper,CeO₂ with novel navicular morphology was synthesized via simple hydrothermal treatment,using lysozyme as the template,cerous nitrate as the cerium source and potassium carbonate as the precipitant,and characterized by XRD,SEM,TEM and N₂-adsorption. The resuhs showed that the navicular CeO₂ had an elliptical structure,with the overall three-dimensional structure assembled by many CeO₂ crystals with grain size of （8-10） nm and surface area of 32.2 m²·g^-1. Activity of the navicular CeO₂ was investigated using CO catalytic oxidation as the probe reaction,with ignition temperature T₅₀ of 230 ℃ and complete conversion temperature T₁₀₀ of 250 ℃.更多还原