DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ryoo, Ryong | ko |
dc.contributor.author | Ko, CH | ko |
dc.contributor.author | Howe, RF | ko |
dc.date.accessioned | 2013-03-02T19:22:49Z | - |
dc.date.available | 2013-03-02T19:22:49Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1997 | - |
dc.identifier.citation | CHEMISTRY OF MATERIALS, v.9, no.7, pp.1607 - 1613 | - |
dc.identifier.issn | 0897-4756 | - |
dc.identifier.uri | http://hdl.handle.net/10203/75138 | - |
dc.description.abstract | The distribution of framework aluminum inside micrometer-size particles of the mesoporous molecular sieve MCM-41 has been investigated using transmission electron microscopic (TEM) images, after supporting platinum clusters inside the aluminum-containing region selectively via the ion exchange of Pt(NH3)(4)(2+). The TEM images show that the framework aluminum becomes distributed homogeneously inside the resultant MCM-41 particles if sodium aluminate is added to the reaction mixture, consisting of an aqueous solution of hexadecyltrimethylammonium (HTA) chloride and sodium silicate, before the formation of the surfactant-silicate mesostructure. On the other hand, the framework aluminum can be incorporated into the outer region within MCM-41 particles if the aluminum source is added after completing the formation of the mesostructure. The thickness of the aluminum-containing region, which results from the aluminum diffusion into the surfactant-silicate mesostructure, can be controlled by the diffusion time and the concentration of the aluminum source. In addition, powder X-ray diffraction indicates that the structural order is unproved when the aluminum source is added after the formation of the surfactant-silicate mesostructure, rather than before. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Imaging the distribution of framework aluminum in mesoporous molecular sieve MCM-41 | - |
dc.type | Article | - |
dc.identifier.wosid | A1997XL71100017 | - |
dc.identifier.scopusid | 2-s2.0-0000962218 | - |
dc.type.rims | ART | - |
dc.citation.volume | 9 | - |
dc.citation.issue | 7 | - |
dc.citation.beginningpage | 1607 | - |
dc.citation.endingpage | 1613 | - |
dc.citation.publicationname | CHEMISTRY OF MATERIALS | - |
dc.identifier.doi | 10.1021/cm9700110 | - |
dc.contributor.localauthor | Ryoo, Ryong | - |
dc.contributor.nonIdAuthor | Ko, CH | - |
dc.contributor.nonIdAuthor | Howe, RF | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | THERMAL-STABILITY | - |
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