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Structure, morphology and reducibility of ceria-doped zirconia

Abstract : Zr1-xCexOx has been prepared by hydrolysis, in neutral medium, starting from rough ZrO2 and CeO2 materials as simple and cheaper synthesis method compared to sol-gel routes. The oxy-hydroxide precursors thus obtained were calcined under air at 450 °C, 900 °C and 1200 °C. The impact of those thermal treatments on the structure, texture and related redox properties has been investigated. Higher specific surface area than those observed on ceria were observed after calcination at low temperature, i.e., 450 °C. Above that temperature thermal sintering occurs having a detrimental effect on the specific surface area related to crystal growth more accentuated on CeO2. The formation of several Zrsingle bondCe mixed oxide phases formed by incorporation and substitution of Zr in the structure of ceria was characterized. A complete loss of specific surface area is noticeable after calcination at 1200 °C. XRD and SEM analysis revealed the formation of two mixed oxides structure, i.e. Ce2Zr2O7.04 and Ce2Zr2O7 corresponding to different redox behavior evidenced from H2-TPR experiments.
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https://hal.univ-lille.fr/hal-03153607
Contributeur : Lilloa Université de Lille <>
Soumis le : vendredi 26 février 2021 - 15:15:50
Dernière modification le : samedi 27 février 2021 - 03:19:21

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Koubra Aribi, Zohra Soltani, Madani Ghelamallah, Pascal Granger. Structure, morphology and reducibility of ceria-doped zirconia. Journal of Molecular Structure, Elsevier, 2018, Journal of Molecular Structure, 1156, pp.369-376. ⟨10.1016/j.molstruc.2017.11.104⟩. ⟨hal-03153607⟩

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