CeO2-Fe2O3催化剂的低浓度CH4催化燃烧性能:Ce/Fe物质的量比的影响

doi:10.11896/cldb.24030162

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Abstract A series of CeO₂-Fe₂O₃ composite oxide catalysts with different Ce/Fe molar ratios were synthesized by hydrothermal method, which were used for lean methane catalytic combustion. The CeO₂-Fe₂O₃ composite oxide catalysts were characterized by N₂ sorption-desorption, XRD, SEM, H₂-TPR, O₂-TPD and XPS. The effects of Ce/Fe molar ratio on the structure, performance, and lean methane catalytic combustion performance of CeO₂-Fe₂O₃ composite oxide catalysts were studied. O₂-TPD results indicate that the mobility of lattice oxygen in CeO₂-Fe₂O₃ composite oxide catalysts improves with the increase of iron molar ratio. XPS results indicate that a small doping amount of Fe³⁺ facilitates the formation of oxygen vacancies whereas a large doping amount of Fe³⁺ annihilates oxygen vacancies. The Ce3Fe1 composite oxide with the highest oxygen vacancy concentration does not have the highest CH₄ conversion. Therefore, the lean methane catalytic combustion activity of CeO₂-Fe₂O₃ composite oxide catalysts is not only related to the content of oxygen vacancies, but also to the lattice oxygen mobility and Fe₂O₃ content of the catalyst. The Ce1Fe1 composite oxide with better lattice oxygen mobility and higher iron content exhibits the highest CH₄ conversion, and CH₄ can be completely converted at 500 ℃.

Key words： ceria ferric oxide lean methane catalytic combustion

Published: 10 May 2025 Online: 2025-04-28

CLC number:

O643

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	Articles by authors
	LI Shuna
	NING Weichen
	LI Xiaojun
	YANG Yi
	ZHENG Han
	ZHANG Yagang

Cite this article:

LI Shuna,NING Weichen,LI Xiaojun, et al. Lean Methane Catalytic Combustion over CeO₂-Fe₂O₃ Catalyst:Effect of Ce/Fe Molar Ratio[J]. Materials Reports, 2025, 39(9): 24030162-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24030162 OR https://www.mater-rep.com/EN/Y2025/V39/I9/24030162

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