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Peer-reviewedCC BY 4.0Catalysts

Roles of Ru Loading in Modulating Soot Oxidation Activity and Sulfur Resistance of Ru/Al2O3 Catalysts

  • Jinhao Li1
  • Zejun Liu1,2
  • Xiaodong Wu1
  • Changlong Zheng1
  • Rui Ran1
  • Lun Hua3
  • Jianli Jia2
  1. 1Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  2. 2School of Chemical and Environmental Engineering, China University of Mining and Technology Beijing, Beijing 100083, China
  3. 3Suzhou Automotive Research Institute, Tsinghua University, Suzhou 215200, China
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Abstract

Ru loading affects both the activity and sulfur resistance of supported Ru catalysts, but the corresponding influencing mechanisms remain unclear. In this study, Ru/Al2O3 catalysts with actual Ru loadings of 0.08–3.77 wt% were prepared and subjected to sulfur poisoning at 350 °C. With increasing Ru loading, the arithmetic mean RuO2 particle diameter grows from 12 to 38 nm, accompanied by a decrease in Ru dispersion. Under loose contact in 10% O2/N2, the fresh catalysts exhibit a volcano-shaped dependence of soot oxidation activity on Ru loading, with 1.91RuAl showing the lowest T50 of 459 °C. Isothermal measurements show that the apparent turnover frequency decreases monotonically at higher Ru loadings, suggesting a balance between the number of accessible Ru sites and their average activity. After sulfur poisoning, the activity increases monotonically with Ru loading, while the change in T50 decreases from +28 to −3 °C. The sulfur content approaches a plateau of approximately 2 wt%, accompanied by a decreasing S/Ru mass ratio. H2-TPR results indicate interactions between Ru species and deposited aluminum sulfate. These findings suggest that Ru loading modifies the balance between sulfate coverage and the promoting effect of adjacent sulfate species. Optimizing Ru loading therefore requires consideration of both fresh soot oxidation activity and the response to sulfur deposition.

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Cite

BibTeXRIS
BibTeX
@article{li2026roles,
  title = {{Roles of Ru Loading in Modulating Soot Oxidation Activity and Sulfur Resistance of Ru/Al2O3 Catalysts}},
  author = {Jinhao Li and Zejun Liu and Xiaodong Wu and Changlong Zheng and Rui Ran and Lun Hua and Jianli Jia},
  journal = {Catalysts},
  year = {2026},
  month = oct,
  doi = {10.3390/catal16110940},
  url = {https://www.mdpi.com/2073-4344/16/11/940},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Roles of Ru Loading in Modulating Soot Oxidation Activity and Sulfur Resistance of Ru/Al2O3 Catalysts
AU  - Jinhao Li
AU  - Zejun Liu
AU  - Xiaodong Wu
AU  - Changlong Zheng
AU  - Rui Ran
AU  - Lun Hua
AU  - Jianli Jia
PY  - 2026
DA  - 2026/10/23
JO  - Catalysts
DO  - 10.3390/catal16110940
UR  - https://www.mdpi.com/2073-4344/16/11/940
AB  - Ru loading affects both the activity and sulfur resistance of supported Ru catalysts, but the corresponding influencing mechanisms remain unclear. In this study, Ru/Al2O3 catalysts with actual Ru loadings of 0.08–3.77 wt% were prepared and subjected to sulfur poisoning at 350 °C. With increasing Ru loading, the arithmetic mean RuO2 particle diameter grows from 12 to 38 nm, accompanied by a decrease in Ru dispersion. Under loose contact in 10% O2/N2, the fresh catalysts exhibit a volcano-shaped dependence of soot oxidation activity on Ru loading, with 1.91RuAl showing the lowest T50 of 459 °C. Isothermal measurements show that the apparent turnover frequency decreases monotonically at higher Ru loadings, suggesting a balance between the number of accessible Ru sites and their average activity. After sulfur poisoning, the activity increases monotonically with Ru loading, while the change in T50 decreases from +28 to −3 °C. The sulfur content approaches a plateau of approximately 2 wt%, accompanied by a decreasing S/Ru mass ratio. H2-TPR results indicate interactions between Ru species and deposited aluminum sulfate. These findings suggest that Ru loading modifies the balance between sulfate coverage and the promoting effect of adjacent sulfate species. Optimizing Ru loading therefore requires consideration of both fresh soot oxidation activity and the response to sulfur deposition.
SN  - 2073-4344
ER  -