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材料导报  2025, Vol. 39 Issue (9): 24030162-7    https://doi.org/10.11896/cldb.24030162
  无机非金属及其复合材料 |
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
李树娜1,*, 宁威臣1, 李小军1, 杨毅1, 郑含1, 张亚刚2
1 西安邮电大学理学院,西安 710121
2 西安科技大学化学与化工学院,西安 710054
Lean Methane Catalytic Combustion over CeO2-Fe2O3 Catalyst:Effect of Ce/Fe Molar Ratio
LI Shuna1,*, NING Weichen1, LI Xiaojun1, YANG Yi1, ZHENG Han1, ZHANG Yagang2
1 School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
2 College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
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摘要 采用水热合成法,通过改变Ce/Fe物质的量比制备了一系列CeO2-Fe2O3复合氧化物催化剂,并将其用于低浓度CH4催化燃烧,利用N2吸脱附、XRD、SEM、H2-TPR、O2-TPD及XPS等技术对催化剂进行表征,研究了Ce/Fe物质的量比对CeO2-Fe2O3复合氧化物催化剂结构、性能及低浓度CH4催化燃烧反应性能的影响。O2-TPD分析结果表明,随着铁摩尔分数的增加,CeO2-Fe2O3复合氧化物体相晶格氧的流动性变好;XPS分析结果表明,少量Fe3+的掺入有利于氧空位的形成,而大量Fe3+的引入则会导致氧空位湮灭。氧空位浓度最高的Ce3Fe1复合氧化物不具有最高的CH4转化率。因此,CeO2-Fe2O3复合氧化物催化剂的低浓度CH4催化燃烧活性除与氧空位的含量有关外,还与催化剂的晶格氧流动性及Fe2O3的含量等因素有关;晶格氧流动性更好、铁含量更高的Ce1Fe1复合氧化物呈现出最高的CH4转化率,500 ℃时可将CH4完全转化。
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李树娜
宁威臣
李小军
杨毅
郑含
张亚刚
关键词:  CeO2  Fe2O3  低浓度甲烷  催化燃烧    
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
出版日期:  2025-05-10      发布日期:  2025-04-28
ZTFLH:  O643  
基金资助: 国家自然科学基金(22178285);陕西省自然科学基金(2021JM-508;2021JM-387);2023年国家级大学生创新创业训练计划项目(202311664018)
通讯作者:  *李树娜,博士,西安邮电大学副教授、硕士研究生导师。主要从事微纳米材料的形貌调控及催化性能研究。lishuna165@126.com   
引用本文:    
李树娜, 宁威臣, 李小军, 杨毅, 郑含, 张亚刚. 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[J]. 材料导报, 2025, 39(9): 24030162-7.
LI Shuna, NING Weichen, LI Xiaojun, YANG Yi, ZHENG Han, ZHANG Yagang. Lean Methane Catalytic Combustion over CeO2-Fe2O3 Catalyst:Effect of Ce/Fe Molar Ratio. Materials Reports, 2025, 39(9): 24030162-7.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.24030162  或          https://www.mater-rep.com/CN/Y2025/V39/I9/24030162
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