Abstract CeO2 aerogel (CeO2-A), nanorod (CeO2-R) and nanoflake (CeO2-F) were prepared via sol-gel, hydrothermal and coprecipitation methods, respectively. The effect of morphology and structure of CeO2 on the catalytic performance in toluene combustion reaction was investigated based on structure analysis provided by characterization. The results revealed that the activity of both CeO2-R and CeO2-F was inferior to that of CeO2-A, due to smaller specific surface area and only exposure of (111) crystal plane dominantly detected from their TEM images for CeO2-R and CeO2-F. While, the CeO2-A had a larger specific surface area and more exposed (111) and (100) facet, which contributed to exposure and formation of more oxygen vacancies and further to the adsorption of more gaseous oxygen. In addition, highly mobile lattice oxygen was another critical factor for influencing the catalytic performance of CeO2, which was beneficial to the redox cycle of Ce3+/Ce4+ and could further accelerate the toluene combustion. As a result, the CeO2-A catalyst exhibited the superior performance in toluene catalytic combustion with t50 of 223°C and t90 of 239°C, respectively, owing to the larger specific surface area, higher exposure of reactive crystal plane and stronger mobility of lattice oxygen.

中文翻译：

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制备方法对CeO2甲苯燃烧结构及催化性能的影响

摘要 分别采用溶胶-凝胶法、水热法和共沉淀法制备了CeO2气凝胶（CeO2-A）、纳米棒（CeO2-R）和纳米薄片（CeO2-F）。基于表征提供的结构分析，研究了CeO2的形貌和结构对甲苯燃烧反应催化性能的影响。结果表明，由于比表面积较小，CeO2-R 和 CeO2-F 的活性均低于 CeO2-A，并且从 CeO2-R 的 TEM 图像中主要检测到 (111) 晶面的暴露， CeO2-F。而CeO2-A具有更大的比表面积和更多的暴露（111）和（100）晶面，这有助于暴露和形成更多的氧空位并进一步吸附更多的气态氧。此外，高迁移率的晶格氧是影响CeO2催化性能的另一个关键因素，有利于Ce3+/Ce4+的氧化还原循环，可以进一步加速甲苯的燃烧。结果表明，CeO2-A 催化剂在甲苯催化燃烧中表现出优异的性能，t50 分别为 223 ℃和 t90 为 239 ℃，这是由于更大的比表面积、更高的反应晶面暴露和更强的流动性。晶格氧。