FTIR study of low-temperature CO adsorption on Mn-ZSM-5 and MnY zeolites. Effect of the zeolite matrix on the formation of Mn2+(CO)x geminal species

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dc.citation.epage319en_US
dc.citation.issueNumber8en_US
dc.citation.spage313en_US
dc.citation.volumeNumber3en_US
dc.contributor.authorHadjiivanov, K.en_US
dc.contributor.authorIvanova, E.en_US
dc.contributor.authorKantcheva, M.en_US
dc.contributor.authorCiftlikli, E. Z.en_US
dc.contributor.authorKlissurski, D.en_US
dc.contributor.authorDimitrov, L.en_US
dc.contributor.authorKnözinger, H.en_US
dc.date.accessioned2015-07-28T11:57:07Z
dc.date.available2015-07-28T11:57:07Z
dc.date.issued2002-08en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractAdsorption of CO on Mn-ZSM-5 zeolite at 85 K results in formation of physically adsorbed CO, several kinds of H-bonded CO and Mn2+ (CO)(x) geminal species (2202 cm(-1)). Decreasing the coverage during evacuation results in disappearance of the physically adsorbed CO and the H-bonded forms and in conversion of the dicarbonyls to linear Mn2+-CO Species (2214 cm(-1)). The latter are quite stable at 85 K. Coadsorption (CO)-C-12 and (CO)-C-13 reveals that the CO molecules in the geminal polycarbonyls behave as independent oscillators. In contrast, CO adsorption at 85 K on MnNaY zeolite only leads to formation of linear Mn2+-CO species (2210 cm-1) and mono- and di-carbonyls associated with residual sodium cations. The results are interpreted as evidence that site-specified geminal carbonyls are formed with cations possessing an ionic radius bigger than a critical value. This value is different for different positions in various zeolites and is bigger for cations in S-II positions in Y zeolites than is the case of cations in a ZSM-5 matrix. (C) 2002 Elsevier Science B.V. All rights reserved.en_US
dc.identifier.doi10.1016/S1566-7367(02)00140-1en_US
dc.identifier.issn1566-7367
dc.identifier.urihttp://hdl.handle.net/11693/11220
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/S1566-7367(02)00140-1en_US
dc.source.titleCatalysis Communicationsen_US
dc.subjectAdsorptionen_US
dc.subjectCarbon monoxideen_US
dc.subjectGerninal carbonylsen_US
dc.subjectMnYen_US
dc.subjectMn - zsm - 5en_US
dc.titleFTIR study of low-temperature CO adsorption on Mn-ZSM-5 and MnY zeolites. Effect of the zeolite matrix on the formation of Mn2+(CO)x geminal speciesen_US
dc.typeArticleen_US

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