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Hydrothermal stability of CeO2-Al2O3 composites, a structural study and oxygen storage capacities

机译：CeO2-Al2O3复合材料的水热稳定性，结构研究和储氧能力

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摘要

A series of CeO2-Al2O3 composites with different Ce content were prepared. The uniformity of the CeO2 dispersion was confirmed using H-2-TPR and HR-TEM. Two aging treatments were conducted, and the CeO2-Al2O3 composites show superior hydrothermal stability. The sintering of CeO2 and Al2O3 are independent of each other based on XRD and HR-TEM results. On the other hand, the dynamic oxygen storage capacity (DOSC) is mostly activated after 20 h of aging at 750 degrees C, and deactivated after 10 h of aging at 1050 degrees C. Combining the results of structural and DOSC studies, the interaction between CeO2 and Al2O3 can be divided into two parts, (1) a chemical interaction which negatively impacts the DOSC, and (2) a spatial limitation which benefits the sample stability. The former interaction is eliminated after hydrothermal aging at 750 degrees C, while the later one exists even after hydrothermal aging at 1050 degrees C.
机译：制备了一系列不同铈含量的CeO2-Al2O3复合材料。使用H-2-TPR和HR-TEM证实了CeO2分散体的均匀性。进行了两次时效处理，并且CeO2-Al2O3复合材料表现出优异的水热稳定性。根据XRD和HR-TEM结果，CeO2和Al2O3的烧结彼此独立。另一方面，动态储氧能力（DOSC）在750摄氏度时效20小时后大部分被激活，而在1050摄氏度时效10小时后则被取消。结合结构研究和DOSC研究的结果， CeO2和Al2O3可分为两部分，（1）对DOSC产生负面影响的化学相互作用，（2）有益于样品稳定性的空间限制。在750摄氏度的水热老化后，消除了前者的相互作用，而即使在1050摄氏度的水热老化后，仍存在了后者。

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