Abstract In this paper, the formation mechanism of mesoporous CeO2 synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion, as well as the structure-activity relationship between them were studied in depth. The self-assembly process and physicochemical properties of CeO2 were characterized by thermogravimetry analyzer, powder X-ray diffraction, N2 adsorption/desorption, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy techniques. Characterization results show that Ce-MOF is completely decomposed into pure mesoporous CeO2 when the decomposition temperature is higher than 400 °C. At this threshold temperature, CeO2 (400) has the largest specific surface area and pore volume of 114 m2/g and 0.152 cm3/g, respectively. CeO2 (400) exhibits very high catalytic activity for benzene combustion, which can completely catalyze the degradation of benzene at 260 °C. Meanwhile, the mesoporous CeO2 (400) supported Pt nanocrystalline catalysts were prepared by high temperature solution-phase reduction method. Pt/CeO2 (400) can completely degrade benzene at about 200 °C and represent high durability and good water-resistance for benzene combustion during 100 h of continuous reaction.

中文翻译：

---

Ce-MOF热分解合成CeO2的机理及苯催化燃烧性能

摘要 本文深入研究了Ce-MOF热分解合成介孔CeO2的形成机理及其苯催化燃烧性能，以及它们之间的构效关系。通过热重分析仪、粉末X射线衍射、N2吸附/解吸、高分辨率透射电子显微镜和X射线光电子能谱技术对CeO2的自组装过程和理化性质进行了表征。表征结果表明，当分解温度高于400℃时，Ce-MOF完全分解为纯介孔CeO2。在此阈值温度下，CeO2 (400) 的比表面积和孔体积最大，分别为 114 m2/g 和 0.152 cm3/g。CeO2(400)对苯的燃烧表现出非常高的催化活性，在260℃下可以完全催化苯的降解。同时，采用高温溶液相还原法制备了介孔CeO2(400)负载的Pt纳米晶催化剂。Pt/CeO2 (400) 可以在 200 °C 左右完全降解苯，并且在 100 小时的连续反应过程中，苯燃烧具有高耐久性和良好的耐水性。