{"title":"Role of MgAl2O4 and γ-Al2O3 Supports in Modulating Oxygen Activity of LaFeO3 for Methane Oxidation","authors":"Minsu Park, Hyemin An, Siwon Lee","doi":"10.1007/s10562-025-05091-9","DOIUrl":null,"url":null,"abstract":"<div><p>Developing advanced methane conversion catalysts is essential for reducing methane emissions and enhancing gas turbine performance. In this study, LaFeO<sub>3</sub> perovskite catalysts supported on high-surface-area γ-Al<sub>2</sub>O<sub>3</sub> and MgAl<sub>2</sub>O<sub>4</sub> were synthesized via the sol-gel method and evaluated for methane oxidation. Structural and compositional analyses confirmed the successful incorporation of LaFeO<sub>3</sub> on MgAl<sub>2</sub>O<sub>4</sub>, whereas its formation on γ-Al<sub>2</sub>O<sub>3</sub> was limited by interactions with underlying support, leading to secondary phase formation. Quantitative modeling based on rate equations revealed the contributions of two oxygen species (i.e., surface oxygen and lattice oxygen) to the reaction, elucidating catalyst-specific reaction pathways. The MgAl<sub>2</sub>O<sub>4</sub>-supported LaFeO<sub>3</sub> exhibited enhanced methane oxidation performance compared to conventional LaFeO<sub>3</sub> due to the increased participation of both lattice and surface oxygen species in the reaction. In contrast, the γ-Al<sub>2</sub>O<sub>3</sub>-supported LaFeO<sub>3</sub> catalyst performed similarly to bulk LaFeO<sub>3</sub>, likely due to Al-induced secondary phases that suppressed oxygen availability. These findings offer novel insights into optimizing methane oxidation catalysts through rational material design.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 8","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis Letters","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10562-025-05091-9","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Developing advanced methane conversion catalysts is essential for reducing methane emissions and enhancing gas turbine performance. In this study, LaFeO3 perovskite catalysts supported on high-surface-area γ-Al2O3 and MgAl2O4 were synthesized via the sol-gel method and evaluated for methane oxidation. Structural and compositional analyses confirmed the successful incorporation of LaFeO3 on MgAl2O4, whereas its formation on γ-Al2O3 was limited by interactions with underlying support, leading to secondary phase formation. Quantitative modeling based on rate equations revealed the contributions of two oxygen species (i.e., surface oxygen and lattice oxygen) to the reaction, elucidating catalyst-specific reaction pathways. The MgAl2O4-supported LaFeO3 exhibited enhanced methane oxidation performance compared to conventional LaFeO3 due to the increased participation of both lattice and surface oxygen species in the reaction. In contrast, the γ-Al2O3-supported LaFeO3 catalyst performed similarly to bulk LaFeO3, likely due to Al-induced secondary phases that suppressed oxygen availability. These findings offer novel insights into optimizing methane oxidation catalysts through rational material design.
期刊介绍：
Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.
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