Thermal stability of Ru-based catalysts for soot oxidation: Strong metal-support interactions and reaction scenarios

IF 9.6 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2026-10-01 Epub Date: 2025-09-22 DOI:10.1016/j.jre.2025.09.030

Changlong Zheng, Dawei Pang, Baofang Jin, Xiaodong Wu, Jinhao Li, Shuang Liu, Rui Ran, Duan Weng

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引用次数: 0

Abstract

Typically, soot oxidation catalysts require high thermal stability to ensure long-term durability. This study investigated the thermal stability of Ru catalysts supported on CeO₂ and Al₂O₃, along with their soot oxidation performance under O₂ and NO atmospheres. The results demonstrate that the fresh Ru/Al₂O₃ catalyst exhibits higher soot oxidation activity than fresh Ru/CeO₂ in both O₂ and NO environments, likely due to the higher oxygen activation and NO oxidation abilities. However, after prolonged thermal aging, Ru/Al₂O₃ suffers from severe sintering of RuO₂ particles, accompanied by partial volatilization of Ru species. This degradation leads to a significant decrease in soot oxidation activity under O₂, as the loss of active sites and reduced redox capability weakens the ability of catalyst to activate oxygen. In contrast, Ru/CeO₂ maintains relatively stable activity in O₂ due to the formation of Ru–O–Ce interfacial bonds, which effectively anchors Ru nanoparticles and suppresses their agglomeration during thermal aging. Interestingly, in the presence of NO, both catalysts show similar degrees of deactivation after thermal aging. This suggests that “NO₂-assisted” soot oxidation mechanism may partially compensate for the loss of active sites, resulting in comparable activity decay trends for Ru/Al₂O₃ and Ru/CeO₂ despite their differing thermal stabilities. These findings highlight the critical role of metal-support interactions in governing the thermal stability of Ru-based soot oxidation catalysts. This investigation provides a theoretical basis for the further design and preparation of highly efficient and stable soot oxidation catalysts.

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煤烟氧化钌基催化剂的热稳定性：强金属支撑相互作用和反应情景

通常，煤烟氧化催化剂需要高热稳定性以确保长期耐用性。研究了CeO2和Al2O3负载Ru催化剂的热稳定性，以及在O2和NO气氛下的烟尘氧化性能。结果表明，在O2和NO环境下，新鲜Ru/Al2O3催化剂表现出比新鲜Ru/CeO2更高的烟尘氧化活性，这可能是由于更高的氧活化和NO氧化能力。然而，经过长时间的热时效后，Ru/Al2O3发生了严重的RuO2颗粒烧结，并伴有部分Ru物质的挥发。这种降解导致烟灰在O2下的氧化活性显著下降，因为活性位点的损失和氧化还原能力的降低削弱了催化剂的活性氧能力。相比之下，Ru/CeO2在O2中保持相对稳定的活性是由于Ru - o - ce界面键的形成，这有效地锚定了Ru纳米颗粒并抑制了它们在热老化过程中的团聚。有趣的是，在NO的存在下，两种催化剂在热老化后表现出相似的失活程度。这表明“no2辅助”烟灰氧化机制可能部分补偿了活性位点的损失，导致Ru/Al2O3和Ru/CeO2的活性衰减趋势相似，尽管它们的热稳定性不同。这些发现强调了金属-载体相互作用在控制钌基烟尘氧化催化剂热稳定性中的关键作用。本研究为进一步设计和制备高效稳定的煤烟氧化催化剂提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.