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A novel Ce0.485Zr0.485Y0.03O2 composite oxide with surface doping of Y and its application in Pd-only three-way catalyst

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Abstract

The ceria-zirconia compound oxide-supported noble metal Pd (Pd@CZ) is widely used in three-way catalyst. Moreover, the surface structure of CZ plays an important role in catalytic activity of Pd. However, how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a challenge. In this paper, a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in CZ. The precipitate-deposition method is developed to prepare the novel Ce0.485Zr0.485Y0.03O2 composite with surface doping of Y (CZ-Y-S). In addition, the Pd@CZ-Y-S (Pd supported on CZ-Y-S) exhibits superior catalytic activity for HC, CO, and NO oxide, wherein, for CO and C3H6 oxidation, the low-temperature activity of Pd@CZ-Y-S is still 20% higher than that of Pd@CZ-Y-B (Y bulk doping) and commercial Pd@CZ after 1000 °C/4 h aging. The effect mechanism is further studied by density functional theory (DFT) calculation. Compared with Pd@CZ-Y-B, Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of O2. The Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.

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摘要

铈锆复合氧化物（CZ）负载贵金属Pd（Pd@CZ）后可广泛应用于三元催化剂中。此外，CZ的表面结构对Pd的催化活性起着重要的作用。然而，如何调控CZ的表面结构，阐明其构效关系仍然是一个挑战。本文提出了一种通过调节CZ中的Y掺杂位点来开发高活性的Pd@CZ纳米催化剂的策略。采用沉淀沉积法制备了Y表面掺杂（CZ-Y-S）的新型Ce0.485Zr0.485Y0.03O2复合材料。此外，Pd@CZ-Y-S（CZ-Y-S负载Pd）对HC、CO和NO催化氧化具有优越的催化活性。其中，对于CO和丙烯氧化，经过1000℃/4h老化后Pd@CZ-Y-S的低温活性仍然比Pd@CZ-Y-B（Y体相掺杂）和商业Pd@CZ高20%。通过密度泛函理论（DFT）的计算，进一步研究了其反应机理。结果表明，与Pd@CZ-Y-B相比，Pd@CZ-Y-S对O2的吸附强度较弱，使CO氧化物反应能垒较低，有利于反应物OCOO*的活化。Y表面掺杂策略可以为开发具有广泛应用的高效Pd@CZ催化剂提供有价值的思路。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 52204376), Youth Foundation of Hebei Province (No. E2022103007), Young Elite Scientists Sponsorship Program by CAST 2021QNRC001, High Tech Zone Science and Technology Project of Yanjiao (No. YJXM211211), and Youth Fund Project of GRINM (No. G12620223129035).

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  1. Zheng Zhao and Wei-Xin Zhao have contributed equally to this work.

Authors and Affiliations

  1. National Engineering Research Center for Rare Earth, Grirem Advanced Materials Co. Ltd., GRINM Group Corporation Limited, Beijing, 100088, China

    Zheng Zhao, Wei-Xin Zhao, Yong-Qi Zhang, Mei-Sheng Cui, Yong-Ke Hou, Dong-Ming Chen, Juan-Yu Yang, Zong-Yu Feng & Xiao-Wei Huang

  2. Griem Hi-Tech Co. Ltd., Langfang, 065000, China

    Zheng Zhao, Wei-Xin Zhao, Yong-Qi Zhang, Mei-Sheng Cui, Yong-Ke Hou, Dong-Ming Chen, Juan-Yu Yang, Zong-Yu Feng & Xiao-Wei Huang

  3. Rare Earth Functional Materials (Xiong’an) Innovation Venter Co. Ltd., Baoding, 071700, China

    Zheng Zhao, Wei-Xin Zhao, Yong-Qi Zhang, Mei-Sheng Cui, Yong-Ke Hou, Dong-Ming Chen, Juan-Yu Yang, Zong-Yu Feng & Xiao-Wei Huang

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Xiao-Wei Huang is an editorial board member for Rare Metals and was not involved in the editorial review or the decision to publish this article. The authors declare that they have no conflict of interest.

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Zhao, Z., Zhao, WX., Zhang, YQ. et al. A novel Ce0.485Zr0.485Y0.03O2 composite oxide with surface doping of Y and its application in Pd-only three-way catalyst. Rare Met. 43, 749–757 (2024). https://doi.org/10.1007/s12598-023-02495-7

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