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Nature and Redox Properties of Iron Sites in Zeolites Revealed by Mossbauer Spectroscopy
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SYSNO ASEP 0580141 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nature and Redox Properties of Iron Sites in Zeolites Revealed by Mossbauer Spectroscopy Author(s) Kornas, Agnieszka (UFCH-W) ORCID, RID
Mlekodaj, Kinga (UFCH-W) RID, ORCID
Tabor, Edyta (UFCH-W) RID, ORCIDArticle number e202300543 Source Title ChemPlusChem. - : Wiley - ISSN 2192-6506
Roč. 89, č. 5 (2024)Number of pages 19 s. Language eng - English Country US - United States Keywords n2o decomposition ; fe-fer ; catalytic-activity ; methane hydroxylation ; selective oxidation ; fezsm-5 catalyst ; nitrous-oxide ; active-sites ; acid sites ; al atoms ; Mossbauer spectroscopy ; zeolites ; methane ; iron sites ; N2O decomposition Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GF21-45567L GA ČR - Czech Science Foundation (CSF) GA22-06737S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFCH-W - RVO:61388955 UT WOS 001116949500001 EID SCOPUS 85178900991 DOI 10.1002/cplu.202300543 Annotation Iron-containing zeolite-based catalysts play a pivotal role in environmental processes aimed at mitigating the release of harmful greenhouse gases, such as nitrous oxide (N2O) and methane (CH4). Despite the rich iron chemistry in zeolites, only a fraction of iron species that exhibit an open coordination sphere and possess the ability for electron transfer are responsible for activating reagents. In addition, the splitting of molecular oxygen is facilitated by bare iron cations embedded in zeolitic matrices. Mössbauer spectroscopy is the ideal tool for investigating the valency and geometry of iron species in zeolites because it leaves no iron forms silent and provides insights into in-situ processes. This review is dedicated to the utilization of Mössbauer spectroscopy to elucidate the nature of the extra-framework iron centers in ferrierite (FER), beta-structured (*BEA), and ZSM-5 zeolite (MFI) zeolites, which are active in N2O decomposition and CH4 oxidation through using the active oxygen derived from N2O and O-2. In this work, a structured summary of the Mössbauer parameters established over the last two decades is presented, characterizing the specific iron active centers and intermediates formed upon iron's interaction with N2O/O-2 and CH4. Additionally, the impact of preparation methods, iron loading, and the long-term stability on iron speciation and its redox behavior under reaction conditions is discussed. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0348907
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