Synergic Effects Between Doped Transitional Metals and CeO2Catalysts with 3D Multi-tubular Interconnected Structure Towards Efficient Soot Oxidation

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-07-09 DOI:10.1007/s10562-025-05103-8

Gang Yu, Xiao Cheng, Jiateng Hu, Qianqian Yang, Hongya Wu, Zhigang Yang, Shengjian Qin, Guanglei Zhang

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Abstract

The effective catalyst-soot contact remains a formidable challenge that hinders the full exploitation of their intrinsic activities towards soot oxidation, while the role of catalysts with varying morphologies on the transfer path of active species rembioains a subject of debate. Thus, we fabricated a series of transition metal-doped CeO₂ catalysts with a three-dimensional (3D) multi-tubular interconnected structure using loofah sponge as a bio-template for soot oxidation in the present work. All the catalysts exhibit superior catalytic activity and stability, among which Ce-Mn catalyst possesses the highest specific surface area (68.90 m²/g) and the largest number of oxygen-active species due to the synergistic redox effects between CeO_x and MnO_x, demonstrates the lowest T₅₀ value of 358 °C under tight contact mode. A comparative study was conducted on the catalytic activity of CeO₂ catalysts doped with different transition metal ions under loose contact and close contact conditions. It was observed that the Ce-Cu catalyst exhibited the smallest differential value (ΔT₅₀ = 26 °C) and a remarkably high relative contact degree (DRC = 0.93).It is evident that the Ce-Cu samples exhibit the highest transfer efficiency of oxygen-active species, owing to their 3D multi-tubular interconnected framework, which significantly enhances the contact degree between the catalyst and soot particles. This research offers a comprehensive understanding of the evolution process of active oxygen species, providing guidance for the precise design of efficient CeO₂ catalysts with specific morphology tailored for soot combustion.

Graphical Abstract

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掺杂过渡金属与三维多管互联结构ceo2催化剂协同氧化烟尘的研究

催化剂与煤烟的有效接触仍然是一个巨大的挑战，阻碍了其内在活性对煤烟氧化的充分利用，而不同形态的催化剂在活性物质转移路径上的作用仍然是一个有争议的话题。因此，本研究以丝瓜海绵为生物模板，制备了一系列具有三维（3D）多管互联结构的过渡金属掺杂CeO2催化剂。所有催化剂均表现出优异的催化活性和稳定性，其中Ce-Mn催化剂由于CeOx和MnOx之间的协同氧化还原作用，具有最高的比表面积（68.90 m²/g）和最多的氧活性物质，在紧密接触模式下T50值最低，为358℃。对比研究了掺杂不同过渡金属离子的CeO2催化剂在松散接触和紧密接触条件下的催化活性。Ce-Cu催化剂的差值最小（ΔT50 = 26°C），相对接触度较高（DRC = 0.93）。结果表明，Ce-Cu样品表现出最高的氧活性物质转移效率，这是因为其三维多管状互联框架显著增强了催化剂与烟灰颗粒之间的接触程度。该研究为全面了解活性氧的演化过程提供了依据，为精确设计适合烟尘燃烧的具有特定形态的高效CeO2催化剂提供了指导。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.