DC Field | Value | Language |
---|---|---|
dc.contributor.author | KIM, JM | ko |
dc.contributor.author | KWAK, JH | ko |
dc.contributor.author | JUN, S | ko |
dc.contributor.author | Ryoo, Ryong | ko |
dc.date.accessioned | 2009-11-12T02:05:04Z | - |
dc.date.available | 2009-11-12T02:05:04Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1995-11 | - |
dc.identifier.citation | JOURNAL OF PHYSICAL CHEMISTRY, v.99, no.45, pp.16742 - 16747 | - |
dc.identifier.issn | 0022-3654 | - |
dc.identifier.uri | http://hdl.handle.net/10203/12465 | - |
dc.description.abstract | Mesoporous molecular sieve MCM-41 with a Si/Al ratio of 39 was obtained by hydrothermal synthesis with a gel composition of 6 SiO2:0.1 Al2O3:1 hexadecyltrimethylammonium chloride:0.25 dodecyltrimethylammonium bromide:0.25 tetrapropylammonium bromide:0.15 (NH4)(2)0:1.5 Na2O:300 H2O. The MCM-41 sample incorporating aluminum (AlMCM-41) was calcined in O-2 flow at 813 K and subsequently ion exchanged with Na+, K+, Ca2+, and Y3+. Th, ion exchange levels have been increased as high as 0.41 Na/Al, 0.36 K/A1, 0.37 Ca/A1 and 0.39 Y/A1, respectively. Hydrothermal stability of the ion exchanged A1MCM-41 materials has been investigated with X-ray powder diffraction pattern, BET specific surface area, and magic-angle spinning Al-27 NMR spectroscopy, after the samples were heated for 2 h at various temperatures in O-2 flow saturated with water vapor at room temperature. The hydrothermal stability of the AlMCM-41 has been found to extend to the following temperatures depending on ion exchange: Y3+ (1170 K) approximate to Ca2+ > Na+ (1070 K) approximate to as calcined AlMCM-41 > pure-silica MCM-41 (980 K). | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | LIQUID-CRYSTAL TEMPLATE | - |
dc.title | ION-EXCHANGE AND THERMAL-STABILITY OF MCM-41 | - |
dc.type | Article | - |
dc.identifier.wosid | A1995TD90000039 | - |
dc.identifier.scopusid | 2-s2.0-33751154431 | - |
dc.type.rims | ART | - |
dc.citation.volume | 99 | - |
dc.citation.issue | 45 | - |
dc.citation.beginningpage | 16742 | - |
dc.citation.endingpage | 16747 | - |
dc.citation.publicationname | JOURNAL OF PHYSICAL CHEMISTRY | - |
dc.identifier.doi | 10.1021/j100045a039 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Ryoo, Ryong | - |
dc.contributor.nonIdAuthor | KIM, JM | - |
dc.contributor.nonIdAuthor | KWAK, JH | - |
dc.contributor.nonIdAuthor | JUN, S | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | LIQUID-CRYSTAL TEMPLATE | - |
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