Promotion Effect of Alkali Metals on Pt/Co-CeO2 Nanorod Catalysts for Low-Temperature CO Oxidation

IF 3.8 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2025-04-15 DOI:10.1021/acs.iecr.4c04731

Yanbo Deng, Jiacheng Gao, Anmin Zhao, Wenjia Song, Wenhua Yin, Jiaxi He, Lei Yang, Li Yuan, Yuan Wang, Like Ouyang

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Abstract

Cerium-based materials show great potential in the field of CO catalytic oxidation. Introducing transition metals into CeO₂ can effectively increase its oxygen vacancy concentration and adjust the surface and interface structures of the catalyst. Additionally, optimizing the electronic structure of the Pt active site through alkali metals can further improve the CO oxidation activity and stability. In this work, systematic characterization techniques including XRD, TEM, and BET confirmed the uniform dispersion of alkali metals and noble metal Pt on Co-CeO₂ nanorods. Surface studies revealed that the alkali metals facilitated electron transfer from the support to the Pt active sites. In addition, in situ DRIFTS spectroscopy confirmed that CO catalysis oxidation on the Pt/K/Co-CeO₂ catalyst predominantly follows the MvK mechanism, with carbonates serving as key intermediates. The activation of gas-phase O₂ by abundant oxygen vacancies facilitates the generation of active oxygen species, thereby enhancing the level of CO oxidation. This study reveals promising perspectives for improving the catalysis activity of supported metal catalysts in CO oxidation through alkali metal modification.

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碱金属对Pt/ CO - ceo2纳米棒催化剂低温CO氧化的促进作用

铈基材料在CO催化氧化领域具有广阔的应用前景。在CeO2中引入过渡金属可以有效地提高其氧空位浓度，调节催化剂的表面和界面结构。此外，通过碱金属优化Pt活性位点的电子结构可以进一步提高CO的氧化活性和稳定性。通过XRD、TEM、BET等系统表征技术，证实了碱金属和贵金属Pt在Co-CeO2纳米棒上的均匀分散。表面研究表明，碱金属促进电子从载体转移到Pt活性位点。此外，原位漂移光谱证实，CO在Pt/K/ CO - ceo2催化剂上的催化氧化主要遵循MvK机制，碳酸盐作为关键中间体。丰富的氧空位对气相O2的活化促进了活性氧的生成，从而提高了CO氧化水平。本研究为通过碱金属改性提高负载型金属催化剂的CO氧化活性开辟了广阔的前景。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.