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DC Field | Value | Language |
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dc.citation.endPage | 93 | - |
dc.citation.startPage | 85 | - |
dc.citation.title | JOURNAL OF CATALYSIS | - |
dc.citation.volume | 336 | - |
dc.contributor.author | Hu, Jian Zhi | - |
dc.contributor.author | Xu, Suochang | - |
dc.contributor.author | Kwak, Jahun | - |
dc.contributor.author | Hu, mary Y | - |
dc.contributor.author | Wan, Chuan | - |
dc.contributor.author | Zhao, Zhenchao | - |
dc.contributor.author | Szanyi, Janos | - |
dc.contributor.author | Bao, Xinho | - |
dc.contributor.author | Han, Xiuwen | - |
dc.contributor.author | Wang, Yong | - |
dc.contributor.author | Peden, Charles H. F. | - |
dc.date.accessioned | 2023-12-22T00:06:36Z | - |
dc.date.available | 2023-12-22T00:06:36Z | - |
dc.date.created | 2016-02-15 | - |
dc.date.issued | 2016-04 | - |
dc.description.abstract | High field quantitative 27Al single pulse (SP) MAS NMR combined with temperature programmed desorption (TPD) of ethanol is used to study the surface of γ-Al2O3 during phase transformation processes induced by calcination in the temperature range of 500-1300 °C. Following ethanol adsorption, ethylene is generated during TPD with a desorption temperature above 200 °C. The amount of ethylene decreases monotonically with increasing calcination temperature prior to TPD. Significantly, 27Al SP MAS NMR reveals that the amount of penta-coordinated Al3+ ions also decreases with increasing calcination temperature. A quantitative (within experimental error) correlation between the amount of penta-coordinated Al3+ ions and the amount of strongly adsorbed ethanol molecules (i.e., the ones that convert to ethylene during TPD) is obtained. These results provide good evidence for a proposal that the penta-coordinated aluminum sites are the catalytic active sites on alumina surfaces during ethanol dehydration reaction across the entire course of γ-to-α Al2O3 phase transformations. | - |
dc.identifier.bibliographicCitation | JOURNAL OF CATALYSIS, v.336, pp.85 - 93 | - |
dc.identifier.doi | 10.1016/j.jcat.2016.01.006 | - |
dc.identifier.issn | 0021-9517 | - |
dc.identifier.scopusid | 2-s2.0-84957589546 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/18795 | - |
dc.identifier.url | http://www.sciencedirect.com/science/article/pii/S0021951716000191 | - |
dc.identifier.wosid | 000371944100009 | - |
dc.language | 영어 | - |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | - |
dc.title | High field Al-27 MAS NMR and TPD studies of active sites in ethanol dehydration using thermally treated transitional aluminas as catalysts | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical; Engineering, Chemical | - |
dc.relation.journalResearchArea | Chemistry; Engineering | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | Penta-coordinated alumina | - |
dc.subject.keywordAuthor | Al-27 MAS NMR | - |
dc.subject.keywordAuthor | High magnetic field | - |
dc.subject.keywordAuthor | TPD | - |
dc.subject.keywordPlus | PENTACOORDINATED AL3+ IONS | - |
dc.subject.keywordPlus | GAMMA-ALUMINA | - |
dc.subject.keywordPlus | PHASE-TRANSFORMATION | - |
dc.subject.keywordPlus | DELTA-ALUMINA | - |
dc.subject.keywordPlus | GAMMA-AL2O3 | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | MORPHOLOGY | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | SUPPORT | - |
dc.subject.keywordPlus | ACIDITY | - |
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