DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ryoo, Ryong | - |
dc.contributor.author | Ko, Chang Hyun | - |
dc.contributor.author | Howe, Russell F. | - |
dc.date.accessioned | 2009-09-15T05:29:25Z | - |
dc.date.available | 2009-09-15T05:29:25Z | - |
dc.date.issued | 1997-07 | - |
dc.identifier.citation | Chemistry of Materials, Vol.9, No.7, pp.1607-1613 | en |
dc.identifier.issn | 0897-4756 | - |
dc.identifier.uri | http://hdl.handle.net/10203/11232 | - |
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. | en |
dc.description.sponsorship | R.R. is grateful for financial support from the Australian Research Council for sabbatical leave from KAIST at UNSW to perform the present research. | en |
dc.language.iso | en_US | en |
dc.publisher | American Chemical Society | en |
dc.subject | THERMAL-STABILITY | en |
dc.title | Imaging the Distribution of Framework Aluminum in Mesoporous Molecular Sieve MCM-41 | en |
dc.type | Article | en |
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