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

Guangxi Wei; Meiqing Shen; Hang Li; Hui Wang; Jianqiang Wang; Jun Wang

doi:10.1039/C5RA15731E

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

Guangxi Wei,^a Meiqing Shen,^abc Hang Li,^a Hui Wang,^a Jianqiang Wang^a and Jun Wang*^a

* Corresponding authors

^a Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China
E-mail: wangjun@tju.edu.cn
Tel: +86 22 27407002

^b Collaborative Innovation Centre of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China

^c State Key Laboratory of Engines, Tianjin University, Tianjin 300072, PR China

Abstract

A series of CeO₂–Al₂O₃ composites with different Ce content were prepared. The uniformity of the CeO₂ dispersion was confirmed using H₂-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 °C, and deactivated after 10 h of aging at 1050 °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 °C, while the later one exists even after hydrothermal aging at 1050 °C.

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Article information

DOI: https://doi.org/10.1039/C5RA15731E
Article type: Paper
Submitted: 06 Aug 2015
Accepted: 14 Sep 2015
First published: 14 Sep 2015

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RSC Adv., 2015,5, 80933-80938

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

G. Wei, M. Shen, H. Li, H. Wang, J. Wang and J. Wang, RSC Adv., 2015, 5, 80933 DOI: 10.1039/C5RA15731E

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