CeO2形貌结构对催化湿式空气氧化苯酚性能的影响

采用水热法、沉淀法和溶胶凝胶法制备了3种不同形貌的CeO₂催化材料，并将其用于湿式空气氧化苯酚水溶液过程中，探讨了CeO₂形貌结构对催化湿式氧化苯酚水溶液性能的影响.采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、程序升温还原（TPR）等手段对CeO₂催化材料进行了表征.结果表明，水热法制备的CeO₂催化材料表现出较好催化性能，主要原因是水热法合成的CeO₂呈现交错的纳米棒状结构，主要暴露（220）晶面，且沿着（220）晶向生长.在反应温度为200℃、空气压力为2MPa、苯酚初始浓度500mg/L的条件下，最终（240min）COD的去除率为95.5%.

Effect of morphology on the performance of CeO2 for catalytic wet air oxidation of phenol

Three CeO₂ catalytic materials with different morphologies were prepared with hydrothermal method, precipitation method and sol-gel method, and then used in Catalytic Wet Air Oxidation (CWAO) of phenol aqueous solution. The effect of CeO₂ morphology and structure on the performance of CWAO of phenol aqueous solution was investigated. The CeO₂ catalytic materials were characterized via SEM, TEM, XRD and TPR. The results indicated that the CeO₂ catalytic material synthesized with the hydrothermal method exhibited the best catalytic activity mainly due to the nanorod morphology, which exposed (220) crystal surface, growing along (220) crystal direction. Under the reaction conditions of temperature of 200℃, the air pressure of 2MPa, and the initial concentration of phenol at 500mg/L, the final COD removal rate (240min) could reach as high as 95.5%.