Optimizing low-temperature CO oxidation under realistic combustion conditions: The impact of CeO2 morphology on Au/CeO2 catalysts

Jing Wang, Wei Liu, Yandong Hu, Lei Song, Yuan Hu, Yanbei Hou, Weizhao Hu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of carbon monoxide oxidation catalysts for complex gas environments faces significant challenges in fire scenarios. Only a few representative gases are used as interfering components in simulated real smoke under laboratory conditions, which cannot accurately reflect the performance of catalysts in a real fire. Herein, Au/CeO2 catalysts with high activity were prepared by adjusting the morphology (rod, cube, polyhedron and irregular particles) and exposed crystal surface ratio of CeO2. Rod-like Au/CeO2 (Au/CeO2-NR) achieved 99 % CO conversion at 25 °C and demonstrated excellent water resistance. This excellent activity originates from the high oxygen vacancy concentration of the CeO2-NR and the interaction between Au species and the carrier. A testbed was established by connecting a steady-state tube furnace with a catalytic fixed-bed reactor to evaluate the CO elimination performance of the catalyst under realistic combustion conditions. Despite competitive adsorption of small molecules (H2O, acetone, etc.) on the active sites, Au/CeO2-NR eliminates carbon monoxide in real combustion atmospheres at only 60 °C. This study provides a method for evaluating the catalytic activity of CO in realistic environments, which is promising for practical use in application scenarios dealing with toxic fumes.

Original languageEnglish
Article number137182
JournalJournal of Hazardous Materials
Volume487
DOIs
Publication statusPublished - 5 Apr 2025
Externally publishedYes

Keywords

  • Au/CeO
  • CO elimination
  • Morphology effect
  • Real-world combustion conditions

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Wang, J., Liu, W., Hu, Y., Song, L., Hu, Y., Hou, Y., & Hu, W. (2025). Optimizing low-temperature CO oxidation under realistic combustion conditions: The impact of CeO2 morphology on Au/CeO2 catalysts. Journal of Hazardous Materials, 487, Article 137182. https://doi.org/10.1016/j.jhazmat.2025.137182