DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Kyoungsoo | ko |
dc.contributor.author | Ryoo, Ryong | ko |
dc.contributor.author | Jang, Hee-Dong | ko |
dc.contributor.author | Choi, Minkee | ko |
dc.date.accessioned | 2013-03-12T08:15:27Z | - |
dc.date.available | 2013-03-12T08:15:27Z | - |
dc.date.created | 2012-06-11 | - |
dc.date.created | 2012-06-11 | - |
dc.date.issued | 2012-04 | - |
dc.identifier.citation | JOURNAL OF CATALYSIS, v.288, pp.115 - 123 | - |
dc.identifier.issn | 0021-9517 | - |
dc.identifier.uri | http://hdl.handle.net/10203/101749 | - |
dc.description.abstract | The distribution, acid strength, and steam stability of internal and external acid sites were systematically investigated for nanocrystalline MFI zeolites with different crystallite size (2-300 nm), which were obtained using gemini-surfactants having different alkyl chain lengths. FT-IR spectroscopy using pyridine and 2,6-di-tert-butylpyridine as a base probe revealed that the concentration of external acid sites increased with a decreasing crystallite size. The external sites were weaker than the internal sites in acid strength, but could still catalyze n-octane cracking reactions that require the strongest acid strength among various acid-catalyzed reactions. Most notably, the external acid sites of zeolites exhibited remarkably higher steam stability at 873 K than the internal acid sites. Such an observation was supported by the catalytic results in methanol to dimethylether (DME) and gasoline conversion, and the Claisen-Schmidt condensation involving bulky molecules. (C) 2012 Elsevier Inc. All rights reserved. | - |
dc.language | English | - |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | - |
dc.subject | MESOPOROUS MOLECULAR-SIEVES | - |
dc.subject | POROUS MATERIALS | - |
dc.subject | SINGLE-CRYSTALS | - |
dc.subject | SURFACTANT | - |
dc.subject | ZSM-5 | - |
dc.subject | CRYSTALLIZATION | - |
dc.subject | ISOMERIZATION | - |
dc.subject | DESILICATION | - |
dc.subject | STABILITIES | - |
dc.subject | ADSORPTION | - |
dc.title | Spatial distribution, strength, and dealumination behavior of acid sites in nanocrystalline MFI zeolites and their catalytic consequences | - |
dc.type | Article | - |
dc.identifier.wosid | 000302435600013 | - |
dc.identifier.scopusid | 2-s2.0-84858077818 | - |
dc.type.rims | ART | - |
dc.citation.volume | 288 | - |
dc.citation.beginningpage | 115 | - |
dc.citation.endingpage | 123 | - |
dc.citation.publicationname | JOURNAL OF CATALYSIS | - |
dc.identifier.doi | 10.1016/j.jcat.2012.01.009 | - |
dc.contributor.localauthor | Ryoo, Ryong | - |
dc.contributor.localauthor | Choi, Minkee | - |
dc.contributor.nonIdAuthor | Jang, Hee-Dong | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Nanocrystalline zeolite | - |
dc.subject.keywordAuthor | Hierarchical zeolite | - |
dc.subject.keywordAuthor | Acidity | - |
dc.subject.keywordAuthor | Dealumination | - |
dc.subject.keywordAuthor | Hydrothermal stability | - |
dc.subject.keywordAuthor | Steaming | - |
dc.subject.keywordAuthor | MTG | - |
dc.subject.keywordAuthor | Cracking | - |
dc.subject.keywordPlus | MESOPOROUS MOLECULAR-SIEVES | - |
dc.subject.keywordPlus | POROUS MATERIALS | - |
dc.subject.keywordPlus | SINGLE-CRYSTALS | - |
dc.subject.keywordPlus | SURFACTANT | - |
dc.subject.keywordPlus | ZSM-5 | - |
dc.subject.keywordPlus | CRYSTALLIZATION | - |
dc.subject.keywordPlus | ISOMERIZATION | - |
dc.subject.keywordPlus | DESILICATION | - |
dc.subject.keywordPlus | STABILITIES | - |
dc.subject.keywordPlus | ADSORPTION | - |
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