Abstract Nano-sheets Al2O3 supported CeO2-Fe2O3 binary oxides were prepared by the vacuum impregnation method. The structural and textural properties were characterized by pertinent techniques, and the materials were evaluated as catalysts for the oxidative dehydrogenation of ethylbenzene with carbon dioxide (CO2-ODEB). The characterization results show that all samples maintain the hierarchical structure, and CeO2-like and Fe2O3-like solid solutions were formed when changing the Ce-to-Fe molar ratio. The catalytic performances indicate that CeO2-Fe2O3 binary oxides were effective for CO2-ODEB, and the activity is determined by mobile oxygen, which can facilitate the dehydrogenation process. The DFT studies further identified the reaction pathway and rate determining step. The inter-transmission of oxygen species and the presence of CO2 refill the oxygen vacancies and restore the redox cycle of CeO2-Fe2O3 binary oxides.

中文翻译：

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乙苯与CO2在负载型CeO2-Fe2O3二元氧化物上氧化脱氢的研究

摘要 采用真空浸渍法制备了纳米片Al2O3负载的CeO2-Fe2O3二元氧化物。通过相关技术表征了结构和质地特性，并评估了该材料作为乙苯与二氧化碳氧化脱氢 (CO2-ODEB) 的催化剂。表征结果表明，所有样品均保持分级结构，改变Ce-Fe摩尔比时形成类CeO2和类Fe2O3固溶体。催化性能表明CeO2-Fe2O3二元氧化物对CO2-ODEB有效，其活性由流动氧决定，可促进脱氢过程。DFT 研究进一步确定了反应途径和速率确定步骤。