Precursor effects in preparation CeO2-ZrO2-Al2O3 materials

In this work, a series of CeO2-ZrO2-Al2O3 (CZA) materials were prepared by deposition-precipitation method, among that, the Al(NO3)(3).9H(2)O, pseudo-boehmite and Al2O3 were worked as aluminum precursor, respectively. The results of N-2 adsorption-desorption, H-2-TPR, TEM-mapping, XRD, and XPS show that the aluminum precursor has an impact on interaction between Al2O3 and CeO2-ZrO2 (CZ), resulting in differences in textural, structural and reduction properties of CZA materials. The CZA material from Al(NO3)(3).9H(2)O displays superior textural properties and thermal stability due to the uniform distribution of Ce, Zr and Al. However, its reducing performance is limited own to stronger interactions among the components. On the contrary, the interaction between ZrO2 and Al2O3 is weaker when aluminum precursor is pseudo-boehmite or Al2O3, it facilitates the improvement of the reducing properties, but the obtained CZA material with a poor thermal stability due to the mechanical-like mixing mode between Ce-Zr and Al. Especially, the CZA deriving from pseudo-boehmite, possesses more oxygen vacancies and O beta after aging, so it displays better redox performance.

Automated summary

In this study, CeO2-ZrO2-Al2O3 (CZA) materials were prepared using the deposition-precipitation method, where different aluminum precursors affected the textural, structural, and reduction properties of the materials. CZA material derived from Al(NO3)(3).9H(2)O exhibited superior textural properties and thermal stability but limited reducing performance, while those from pseudo-boehmite or Al2O3 showed improved reducing properties but poor thermal stability. Materials from pseudo-boehmite demonstrated better redox performance due to more oxygen vacancies and O beta after aging.