Determining the location of Co2+ in zeolites by UV-Vis diffuse reflection spectroscopy : A critical view

dc.bibliographicCitation.firstPage123eng
dc.bibliographicCitation.issue1eng
dc.bibliographicCitation.volume10eng
dc.contributor.authorBellmann, Andrea
dc.contributor.authorRautenberg, Christine
dc.contributor.authorBentrup, Ursula
dc.contributor.authorBrückner, Angelika
dc.date.accessioned2021-09-03T10:07:38Z
dc.date.available2021-09-03T10:07:38Z
dc.date.issued2020
dc.description.abstractUV-Vis spectroscopy as well as in situ FTIR spectroscopy of pyridine and CO adsorption were applied to determine the nature of Co species in microporous, mesoporous, and mixed oxide materials like Co-ZSM-5, Co/Na-ZSM-5, Co/Al-SBA-15, and Co/Al2O3-SiO2. Because all sample types show comparable UV-Vis spectra with a characteristic band triplet, the former described UV-Vis band deconvolution method for determination and quantification of individual cationic sites in the zeolite appears doubtful. This is also confirmed by results of pyridine and CO adsorption revealing that all Co-zeolite samples contain two types of Co2+ species located at exchange positions as well as in oxide-like clusters independent of the Co content, while in Co/Al-SBA-15 and Co/Al2O3-SiO2 only Co2+ species in oxide-like clusters occur. Consequently, the measured UV-Vis spectra represent not exclusively isolated Co2+ species, and the characteristic triplet band is not only related to γ-, β-, and α-type Co2+ sites in the zeolite but also to those dispersed on the surface of different oxide supports. The study demonstrates that for proper characterization of the formed Co species, the use of complementary methods is required. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/6695
dc.identifier.urihttps://doi.org/10.34657/5742
dc.language.isoengeng
dc.publisherBasel : MDPIeng
dc.relation.doihttps://doi.org/10.3390/catal10010123
dc.relation.essn2073-4344
dc.relation.ispartofseriesCatalysts 10 (2020), Nr. 1eng
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subjectCO adsorptioneng
dc.subjectCo-ZSM-5eng
dc.subjectFTIR spectroscopyeng
dc.subjectPyridine adsorptioneng
dc.subjectUV-Vis diffuse reflection spectroscopyeng
dc.subject.ddc540eng
dc.titleDetermining the location of Co2+ in zeolites by UV-Vis diffuse reflection spectroscopy : A critical vieweng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleCatalystseng
tib.accessRightsopenAccesseng
wgl.contributorLIKATeng
wgl.subjectChemieeng
wgl.typeZeitschriftenartikeleng
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