DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wasowicz, T | - |
dc.contributor.author | Kim, SJ | - |
dc.contributor.author | Hong, SB | - |
dc.contributor.author | Kevan, L | - |
dc.date.accessioned | 2016-04-01T08:18:14Z | - |
dc.date.available | 2016-04-01T08:18:14Z | - |
dc.date.created | 2010-01-06 | - |
dc.date.issued | 1996-09-26 | - |
dc.identifier.issn | 0022-3654 | - |
dc.identifier.other | 1996-OAK-0000019650 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/27672 | - |
dc.description.abstract | The silicoaluminophosphate type 18 (SAPO-18) is a medium-pore molecular sieve and is of interest as heterogeneous catalysts. A SAPO-18 material was synthesized with an Al:P:Si ratio of 10:9:1 with the silica substituting selectively for the phosphorus sites, thus giving a negatively charged framework. Divalent copper ion exchanged into SAPO-18 from an aqueous solution was used as a spin probe to examine its location in SAPO-18 and its interaction with small molecular adsorbates. To monior the Cu(II) interactions with the local environment, electron spin resonance (ESR) and three-pulse electron spin echo modulation (ESEM) were used. ESEM has been used to detect P-31 modulation to determine the distance and number of P-31 from the Cu(II) ion at various stages of hydration of the material. It was found that in freshly ion-exchanged Cu-SAPO-II at 400 degrees C the Cu(II) is directly coordinated to a hexagonal window inside of the pear-shaped large cavity in SAPO-18. Using deuterium-labeled adsorbates including D2O, ND3, CD3OH, and CH3OD and analyzing the D-2 modulation, the distances between the Cu(II) and the adsorbed molecules are derived. Additionally, the interaction with ND3 ammonia is supported by ESR results obtained fur Cu(II)-(NH3)-N-15 for which the N-15 hyperfine interaction is resolved and reveals the number of interacting N-15. The results show that rehydration involves coordination by three water molecules in a six-membered ring of the framework. For methanol, steric hindrances limit the coordination of only two molecules to Cu(II). Results for ammonia show that the Cu(II) forms a complex with four ammonia molecules most probably in square-planar arrangement. | - |
dc.description.statementofresponsibility | X | - |
dc.language | English | - |
dc.publisher | American Chemical Society | - |
dc.relation.isPartOf | JOURNAL OF PHYSICAL CHEMISTRY | - |
dc.subject | ADSORBATE INTERACTION | - |
dc.subject | CU(II) LOCATION | - |
dc.subject | CATALYST | - |
dc.subject | METHANOL | - |
dc.subject | CONVERSION | - |
dc.subject | PERFORMANCE | - |
dc.subject | SAPO-18 | - |
dc.subject | ETHENE | - |
dc.title | Electron Spin Resonance and Electron Spin Echo Modulation Studies of Cu(II)-Exchanged Silicoaluminophosphate Type 18 Molecular Sieve | - |
dc.type | Article | - |
dc.contributor.college | 환경공학부 | - |
dc.identifier.doi | 10.1021/jp961550f | - |
dc.author.google | Wasowicz, T | - |
dc.author.google | Kim, SJ | - |
dc.author.google | Hong, SB | - |
dc.author.google | Kevan, L | - |
dc.relation.volume | 100 | - |
dc.relation.issue | 39 | - |
dc.relation.startpage | 15954 | - |
dc.relation.lastpage | 15960 | - |
dc.contributor.id | 10077624 | - |
dc.relation.journal | JOURNAL OF PHYSICAL CHEMISTRY | - |
dc.relation.index | SCI급, SCOPUS 등재논문 | - |
dc.relation.sci | SCI | - |
dc.collections.name | Journal Papers | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY, v.100, no.39, pp.15954 - 15960 | - |
dc.identifier.wosid | A1996VK04600047 | - |
dc.date.tcdate | 2019-02-01 | - |
dc.citation.endPage | 15960 | - |
dc.citation.number | 39 | - |
dc.citation.startPage | 15954 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY | - |
dc.citation.volume | 100 | - |
dc.contributor.affiliatedAuthor | Hong, SB | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.wostc | 12 | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | ADSORBATE INTERACTION | - |
dc.subject.keywordPlus | CU(II) LOCATION | - |
dc.subject.keywordPlus | CATALYST | - |
dc.subject.keywordPlus | METHANOL | - |
dc.subject.keywordPlus | CONVERSION | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | SAPO-18 | - |
dc.subject.keywordPlus | ETHENE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
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