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DC Field | Value | Language |
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dc.citation.endPage | 17530 | - |
dc.citation.number | 32 | - |
dc.citation.startPage | 17522 | - |
dc.citation.title | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | - |
dc.citation.volume | 60 | - |
dc.contributor.author | Khivantsev, Konstantin | - |
dc.contributor.author | Jaegers, Nicholas R. | - |
dc.contributor.author | Kwak, Ja-Hun | - |
dc.contributor.author | Szanyi, Janos | - |
dc.contributor.author | Kovarik, Libor | - |
dc.date.accessioned | 2023-12-21T15:37:12Z | - |
dc.date.available | 2023-12-21T15:37:12Z | - |
dc.date.created | 2021-07-23 | - |
dc.date.issued | 2021-08 | - |
dc.description.abstract | gamma-alumina is one of the oldest and most important commercial catalytic materials with high surface area and stability. These attributes enabled its use as the first commercial large-scale heterogeneous catalyst for ethanol dehydration. Despite progress in materials characterization the nature of the specific sites on the surface of gamma-alumina that are responsible for its unique catalytic properties has remained obscure and controversial. By using combined infrared spectroscopy, electron microscopy and solid-state nuclear magnetic resonance measurements we identify the octahedral, amphoteric (O)(5)Al(VI)-OH sites on the (100) segments of massively restructured (110) facets on typical rhombus-platelet gamma-alumina as well as the (100) segments of irrational surfaces (invariably always present in all gamma-alumina samples) responsible for its unique catalytic activity. Such (O)(5)Al(VI)-OH sites are also present on the macroscopically defined (100) facets of gamma-alumina with elongated/rod-like geometry. The mechanism by which these sites lose -OH groups upon thermal dehydroxylation resulting in coordinatively unsaturated penta-coordinate Al+3O5 sites is clarified. These coordinatively unsaturated penta-coordinate Al sites produce well-defined thermally stable Al-carbonyl complexes. Our findings contribute to the understanding of the nature of coordinatively unsaturated Al sites on the surface of gamma-alumina and their role as catalytically active sites. | - |
dc.identifier.bibliographicCitation | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.60, no.32, pp.17522 - 17530 | - |
dc.identifier.doi | 10.1002/anie.202102106 | - |
dc.identifier.issn | 1433-7851 | - |
dc.identifier.scopusid | 2-s2.0-85108781426 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53313 | - |
dc.identifier.url | https://onlinelibrary.wiley.com/doi/10.1002/anie.202102106 | - |
dc.identifier.wosid | 000667812600001 | - |
dc.language | 영어 | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.title | Precise Identification and Characterization of Catalytically Active Sites on the Surface of gamma-Alumina** | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.type.docType | Article; Early Access | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | alumina | - |
dc.subject.keywordAuthor | electron microscopy | - |
dc.subject.keywordAuthor | ethanol dehydration | - |
dc.subject.keywordAuthor | heterogeneous catalysis | - |
dc.subject.keywordAuthor | solid-state NMR spectroscopy | - |
dc.subject.keywordPlus | TEMPERATURE | - |
dc.subject.keywordPlus | GAMMA-AL2O3 | - |
dc.subject.keywordPlus | REACTIVITY | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | CATIONS | - |
dc.subject.keywordPlus | NMR | - |
dc.subject.keywordPlus | IR | - |
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