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首页> 外文期刊>Catalysis science & technology >Facile synthesis of catalytically active CeO2 for soot combustion
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Facile synthesis of catalytically active CeO2 for soot combustion

机译：催化活性CEO 2的便利合成用于烟灰燃烧

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Pure ceria catalysts were prepared by a facile modified homogeneous co-precipitation method, and their catalytic performance was evaluated in the soot oxidation reaction. The structure and textural properties of the synthesized catalysts were characterized via XRD, N-2 adsorption/desorption, TG-DSC-MS, H-2-TPR, FE-SEM, HR-TEM and XPS techniques. It is shown that CeO2 samples prepared by the improved co-precipitation method exhibit obviously better catalytic activity than those prepared by the conventional co-precipitation method. The CeO2-CP4-F sample shows the best activity, for which the peak temperature, T-p, values of soot combustion are about 465 degrees C in O-2 stream gas and 430 degrees C in a NO/O-2 stream under soot/catalyst "loose contact" conditions. Moreover, after high temperature aging, the activity of CeO2-CP4-A becomes even better, for which the T-p value of soot combustion is lowered to 445 degrees C in O-2 air gas. The catalytic activity is not well associated with the physicochemical properties of BET surface area, particle size and reducibility at low temperatures. The number of lattice oxygen and its mobility in the series of CeO2 may be the crucial factor to decide the overall catalytic performance. According to the HRTEM result, the excellent migration of lattice oxygen may result from the preferential exposure of more-reactive planes, which may be the essential reason to explain the good performance of CeO2 catalysts in soot oxidation.
机译：纯陶瓷催化剂是通过简化的修饰均质共沉淀法制备的，并在烟灰氧化反应中评估了它们的催化性能。通过XRD，N-2吸附/解吸，TG-DSC-MS，H-2-TPR，FE-SEM，HR-TEM和XPS技术来表征合成催化剂的结构和纹理特性。结果表明，通过改进的共沉淀法制备的CEO2样品显然比传统的共沉淀方法更好地表现出更好的催化活性。 CEO2-CP4-F样品显示了最佳活性，在O-2流气中，峰值温度，T-P，T-P值约为465度C，在烟灰下的NO/O-2流中为430度C。催化剂“松散接触”条件。此外，在高温衰老之后，CEO2-CP4-A的活性变得更好，在O-2空气中，烟灰燃烧的T-P值降低至445摄氏度。该催化活性与低温下BET表面积，粒径和降低性的物理化学特性没有很好的相关性。晶格氧的数量及其在CEO2系列中的迁移率可能是决定整体催化性能的关键因素。根据HRTEM的结果，晶格氧的出色迁移可能是由于更具反应性平面的优先暴露而导致的，这可能是解释CEO2催化剂在烟灰氧化中良好性能的基本原因。

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