Mesoporous Molecular Sieves MCM-41 with a Hollow Tubular Morphology
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- 作者：Hong-Ping Lin ; Soofin Cheng ; and Chung-Yuan Mou
- 刊名：Chemistry of Materials
- 出版年：1998
- 出版时间：February 1998
- 年：1998
- 卷：10
- 期：2
- 页码：581 - 589
- 全文大小：336K
- 年卷期：v.10,no.2(February 1998)
- ISSN：1520-5002
文摘
The synthesis of the MCM-41 materials with novel hollowtubular morphology in highalkaline condition was studied in detail. The tubular structurecan be obtained in a narrowrange of water/C16TMAB molar ratio, in which lamellarmembranes consisting of thehexagonal arrangement of rod micelles exist. Tubular structuresresult from a membrane-to-tubules transformation. Adding a proper amount of salts into thesynthesis gel of higherwater/C16TMAB molar ratio can help forming tubularstructure. Temperature of the reactionsystem has to be controlled near 30 
C in order to obtain the tubularMCM-41. Incorporationof aluminum into the framework affects the morphology and crystallinityof resultant MCM-41 products. But the stirring rate does not have an appreciableeffect on the formation oftubular morphology. The sample synthesized with theC16TMACl-silicate system with asuitable water content leads to about 70% in tubular morphology, andthe hexagonal structureof MCM-41 channels was formed from a lamellar intermediate.Surfactants with shortercarbon chain length (n < 16) would inhibit the formation oftubular morphology. The productof the C12TMAB-silicate system was in particulateform and that of C14TMAB-silicate inbroken tubular morphology.
C in order to obtain the tubularMCM-41. Incorporationof aluminum into the framework affects the morphology and crystallinityof resultant MCM-41 products. But the stirring rate does not have an appreciableeffect on the formation oftubular morphology. The sample synthesized with theC16TMACl-silicate system with asuitable water content leads to about 70% in tubular morphology, andthe hexagonal structureof MCM-41 channels was formed from a lamellar intermediate.Surfactants with shortercarbon chain length (n < 16) would inhibit the formation oftubular morphology. The productof the C12TMAB-silicate system was in particulateform and that of C14TMAB-silicate inbroken tubular morphology.