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Realization approach of Pd-only three-way catalysts with high catalytic performance and thermal stability

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Abstract

Pd-only three-way catalyst (TWC), Pd supported on washcoating (the mixture of alumina and Ce-Zr solid solution)/cordierite, was prepared and its catalytic performance and the operation window (λ-value) at 450 °C were evaluated with the simulated automotive exhaust feed gas. Surfactants such as Tween-80 and Span-20 were added in the process of preparing the catalyst in order to improve the thermal stability and catalytic performance of Pd-only TWC. The fresh and aged catalysts at 1000 °C for 4 h were characterized by low-temperature N2 adsorption, XRD, XPS, and H2-TPR techniques. The results show that the presence of surfactants in the synthesis slurry could influence the physicochemical properties of the final Pd-only TWC. The FTS catalyst prepared with the mixed surfactant of Tween-80 and Span-20 exhibited excellent three-way catalytic performance. After being aged at 1000 °C for 4 h, the catalytic performances of Pd-only TWCs slightly decreased, but the FTS catalyst still demonstrated higher catalytic performance and better thermal stability compared with the Pd-only catalysts prepared with single surfactant or without any surfactant. And the FTS catalyst has a wider λ value (operation window) than other catalysts, even after being aged at 1000 °C.

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Authors and Affiliations

  1. Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, China

    Yutao Ren, Qun Shen, Yun Guo, Yanqin Wang, Yanglong Guo, Xueqing Gong & Guanzhong Lu

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  1. Yutao Ren
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  2. Qun Shen
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  3. Yun Guo
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  4. Yanqin Wang
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  5. Yanglong Guo
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  6. Xueqing Gong
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  7. Guanzhong Lu
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Correspondence to Guanzhong Lu.

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Ren, Y., Shen, Q., Guo, Y. et al. Realization approach of Pd-only three-way catalysts with high catalytic performance and thermal stability. Sci. China Chem. 58, 123–130 (2015). https://doi.org/10.1007/s11426-014-5276-7

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  • DOI: https://doi.org/10.1007/s11426-014-5276-7

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