Research advances in oxidation catalysts for CO in sintered flue gas

WANG Zhifeng; LI Xiaoman; SHEN Kai; ZHANG Yaping

doi:10.13205/j.hjgc.202609009

Volume 44 Issue 9

Sep. 2026

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WANG Zhifeng, LI Xiaoman, SHEN Kai, ZHANG Yaping. Research advances in oxidation catalysts for CO in sintered flue gas[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(9): 79-90. doi: 10.13205/j.hjgc.202609009

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WANG Zhifeng, LI Xiaoman, SHEN Kai, ZHANG Yaping. Research advances in oxidation catalysts for CO in sintered flue gas[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(9): 79-90. doi: 10.13205/j.hjgc.202609009

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Research advances in oxidation catalysts for CO in sintered flue gas

doi: 10.13205/j.hjgc.202609009

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Received Date: 2025-05-12
Available Online: 2026-11-05

Abstract

Abstract

Sintering flue gas is the main source of CO emissions in the iron and steel industry， and its high toxicity and impact on atmospheric quality have prompted China to set strict emission standards. Catalytic oxidation has become a mainstream technology due to its high efficiency and low energy consumption， but the poisoning problem of catalysts under complex flue gas components （e.g.， SO₂， H₂O） restricts its application. In this paper， the research progress of noble metal （Pt， Pd， Au） and non-precious metal （Cu， Mn， Fe） catalysts is systematically reviewed， and their CO oxidizing activity and anti-poisoning performance are compared. Although the noble metal catalysts have excellent activity， they are usually costly； the non-precious metal catalysts can be significantly improved by carrier modification （e.g.， CeO₂， TiO₂） and doping （e.g.， Mn， V）， which can bring the performance close to the level of the noble metals. Poisoning mechanism analysis showed that SO₂ inhibits the reaction by forming sulfides to cover the active site or competing adsorption， while H₂O affects the catalytic efficiency by competing adsorption or altering the distribution of oxygen species. Anti-toxicity strategies include optimization of carriers （e.g.， CeO₂ preferentially binds SO₂）， construction of bimetallic synergistic systems （e.g.， Cu-V composite oxides）， and surface capping techniques （e.g.， isolation of the active site by SiO₂ shell layers）. Challenges such as low-temperature activity， high humidity adaptability， and stability need to be further addressed in the future to promote the industrial application of non-precious metal catalysts.
- sintering flue gas,
- CO oxidation,
- catalyst poisoning,
- sulfur resistance

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References

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