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CeO2–ZrO2–Al2O3 Modified by Selective Doping with SrO for Improved Pd-Only Three-Way Catalyst

  • Chemical Kinetics and Catalysis
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Abstract

Composite CeO2–ZrO2–Al2O3 (CZA) modified by selective doping with SrO was prepared by simple coprecipitation method. The characterization results reveal that the structural property of the modified sample is fundamentally different from that of undoped CZA, the doped SrO can selectively combine with Al2O3 and act as a stabilizer, meanwhile homogeneous CZ solid solution is formed which appears insusceptible to Al2O3. Consequently more lattice defects are created in CZAS, which facilitate the improvement of oxygen mobility. The UV–Vis DRS and XPS results demonstrate that after doping with SrO, the supported catalyst Pd/CZAS possesses higher surface Pd and Ce3+ concentrations, which consequently leads to improved reducibility and catalytic performance. Furthermore, the synergistic effect between CeO2–ZrO2 and SrO–Al2O3 helps improve the thermal stability of Pd/CZAS. As a result, after aging treatment, Pd/CZASa still maintains improved structural, textural, morphological and reduction properties along with enhanced three-way catalytic performance.

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Authors and Affiliations

  1. College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, 610106, China

    Li Lan, Hongmei Li, Weiwei Yang, Dayu Liu & Wei Wang

  2. Key laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China

    Li Lan, Hongmei Li, Maochu Gong & Yaoqiang Chen

  3. Sinocat Environmental Protection Co., Ltd., Chengdu, 611731, China

    Shanhu Chen

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  1. Li Lan
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  2. Hongmei Li
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  3. Shanhu Chen
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  4. Weiwei Yang
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Correspondence to Hongmei Li.

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Lan, L., Li, H., Chen, S. et al. CeO2–ZrO2–Al2O3 Modified by Selective Doping with SrO for Improved Pd-Only Three-Way Catalyst. Russ. J. Phys. Chem. 92, 696–705 (2018). https://doi.org/10.1134/S0036024418040179

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  • DOI: https://doi.org/10.1134/S0036024418040179

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