Active sites and their individual turnover frequencies for ethylene hydrogenation on reduced graphene aerogel

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dc.authorid0000-0001-9136-6988
dc.contributor.authorKurtoğlu-Öztulum, Samira Fatma
dc.contributor.authorYalçın, Kaan
dc.contributor.authorSaraç Öztun, F. Eylül
dc.contributor.authorKanat, Gizem Hasibe
dc.contributor.authorÜnal, Uğur
dc.contributor.authorUzun, Alper
dc.date.accessioned2024-03-21T06:14:39Z
dc.date.available2024-03-21T06:14:39Z
dc.date.issued2024
dc.departmentTAÜ, Fen Fakültesi, Malzeme Bilimi ve Teknolojileri Bölümüen_US
dc.description.abstractGraphene aerogel (GA) was reduced at various temperatures to prepare a series of reduced graphene aerogels (rGAs) with different surface characteristics. Detailed characterization demonstrated that an increase in the thermal reduction temperature leads to an increase in surface area accompanied by an increase in surface density of defect sites formed by the removal of the oxygen-containing functional groups. rGA samples were then tested for ethylene hydrogenation under identical conditions. A comparison of catalytic performances of each catalyst demonstrated that the rGA sample prepared by reduction in Ar at 900 °C (rGA-900) provides the highest performance compared with others prepared at lower temperatures. Next, we analyzed the per-gram activity of each catalyst as a sum of individual contributions from different defect sites quantified by Raman spectroscopy and CHNS-O analysis to determine the individual turnover frequencies (TOFs) of each active site. This analysis identified polyene-like structures and interstitial defects associated with amorphous sp2 bonded carbon atoms as the dominant active sites responsible for hydrogenation. A comparison of their TOFs further indicated that the polyene-like structures provide approximately ten times higher TOF compared to those associated with the amorphous carbon defects. These results, identifying the dominant active centers and quantifying their corresponding TOFs, provide opportunities toward the rational design of GA-based carbocatalysts.
dc.identifier.citationKurtoğlu-Öztulum, Samira F., Yalçın, K., Saraç Öztun, F. E., Kanat, Gizem H., Ünal, U., Uzun, A. (2024). Active sites and their individual turnover frequencies for ethylene hydrogenation on reduced graphene aerogel. Langmuir, Şubat.
dc.identifier.doi10.1021/acs.langmuir.3c02848
dc.identifier.issn0743-7463
dc.identifier.issueŞubaten_US
dc.identifier.scopus2-s2.0-85185899021
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://hdl.handle.net/20.500.12846/890
dc.identifier.wosWOS:001174418900001
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.ispartofLangmuir
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectDefectsen_US
dc.subjectHydrocarbonsen_US
dc.subjectHydrogenationen_US
dc.subjectRedox reactionsen_US
dc.subjectTwo dimensional materialsen_US
dc.titleActive sites and their individual turnover frequencies for ethylene hydrogenation on reduced graphene aerogel
dc.typeArticle

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