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Performance and reaction path of NO removal by Ir, Co, and Ce–Fe/AC catalysts in the coupled CO + NH3 process at medium and low temperatures
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DOI：10.1007/s11164-026-06084-y.png)
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Abstract
En 中文
In this study, the effects of iron/activated carbon (Fe/AC) catalysts modified with iridium (Ir), cobalt (Co), and cerium (Ce) on the NO removal performance through the coupled CO + NH3 process at medium and low temperatures were investigated. Then, 1.0Ir, Co, and Ce-12.5Fe/AC catalysts were prepared, and the reaction pathway for the coupled NO removal process was proposed based on ex situ characterization results and previously reported catalytic mechanisms. The results showed that, when compared at the same reaction temperature, the 1.0Co-12.5Fe/AC catalyst exhibited the highest NO removal activity in the coupled CO + NH3 process. The 1.0Ir-12.5Fe/AC and the 1.0Ce-12.5Fe/AC catalysts exhibited the highest NO removal activity at the medium-temperature stage and the high-temperature stage, respectively. The subsequent loading of the second metal partially blocked the catalyst pores, thus reducing the specific surface area to varying degrees. The bimetallic loading intensified the catalyst γ-Fe2O3 diffraction peaks, increased the crystallinity, and deteriorated the dispersion. Additionally, it significantly increased the proportion of Fe2+, and the redox reactions occurred between Ir and Fe, Co and Fe, and Ce and Fe. The Oβ content after the second metal loading was significantly higher than that of the single-metal loading, thereby improving the NO removal activity of the catalysts.
Keywords:
Ir
Co
And Ce–Fe/AC catalysts
Activated carbon
Medium and low temperatures
Coupled CO + NH3 process
NO removal mechanism
Journal
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3.5
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634
Citations:
9.9K
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