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Promoted Hydrothermal Stability of Pd/CeO2 Catalyst by Ba Doping

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Abstract

In this study, a group of Ba-doped Pd/CeO2 catalysts were prepared by impregnation method and hydrothermally aged at 750 °C for 20 h to investigate the effect of Ba addition on the hydrothermal stability of Pd/CeO2. The hydrothermal stability of Pd/CeO2 was promoted when doped with a moderate amount of Ba. Particularly, the aged catalyst with optimal 1.0 wt% Ba addition showed a significant improvement in CO oxidation activity, even when cofeeding water and carbon dioxide, presenting superior hydrothermal stability. The positive effects of Ba addition on inhibiting the sintering of CeO2 and aggregation of Pd during hydrothermal aging were proposed by combining with the structural properties, DRIFTS and XPS characterizations. More importantly, the Ba addition favored the preserving of oxidized Pd2+ and active oxygens, which played an important role in the enhanced CO oxidation activity of Ba-doped catalysts.

Graphical Abstract

Ba addition promoted the hydrothermal stability of Pd/CeO2 catalyst for CO oxidation by the steric effect on Pd.

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Acknowledgements

The work was financially supported by the National Key Research and Development Program (2017YFC0211303) and the National Natural Science Foundation of China (Grant No. 21576207).

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin, 300072, People’s Republic of China

    Jingjing Xie, Jun Wang, Hui Wang, Hang Li, Jianqiang Wang & Meiqing Shen

  2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People’s Republic of China

    Meiqing Shen

  3. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, People’s Republic of China

    Meiqing Shen

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  1. Jingjing Xie
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  2. Jun Wang
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  3. Hui Wang
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  4. Hang Li
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  5. Jianqiang Wang
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  6. Meiqing Shen
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Correspondence to Meiqing Shen.

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Xie, J., Wang, J., Wang, H. et al. Promoted Hydrothermal Stability of Pd/CeO2 Catalyst by Ba Doping. Catal Lett 148, 2596–2607 (2018). https://doi.org/10.1007/s10562-018-2426-0

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  • DOI: https://doi.org/10.1007/s10562-018-2426-0

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