TY - JOUR
T1 - Optimizing low-temperature CO oxidation under realistic combustion conditions
T2 - The impact of CeO2 morphology on Au/CeO2 catalysts
AU - Wang, Jing
AU - Liu, Wei
AU - Hu, Yandong
AU - Song, Lei
AU - Hu, Yuan
AU - Hou, Yanbei
AU - Hu, Weizhao
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/4/5
Y1 - 2025/4/5
N2 - 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.
AB - 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.
KW - Au/CeO
KW - CO elimination
KW - Morphology effect
KW - Real-world combustion conditions
UR - http://www.scopus.com/inward/record.url?scp=85214646564&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2025.137182
DO - 10.1016/j.jhazmat.2025.137182
M3 - Article
AN - SCOPUS:85214646564
SN - 0304-3894
VL - 487
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 137182
ER -