頁籤選單縮合
題 名 | The Synthesis and Application of the Mesoporous Molecular Sieves MCM-41--A Review |
---|---|
作 者 | 林弘萍; 鄭雅如; 林宗榮; 李豐穎; 陳長林; 王志龍; 鄭淑芬; 劉尚斌; 萬本儒; 牟中原; 湯致遠; 林錦燕; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 46:3 1999.06[民88.06] |
頁 次 | 頁495-507 |
分類號 | 340 |
關鍵詞 | M41S; MCM-41; Mesoporous molecular sieves; Delayed neutralization; Hierarchical order; Tubules; Hollow spheres; |
語 文 | 英文(English) |
英文摘要 | We report a "delayed neutralization" process for the preparation of highly-ordered aluminosilicate MCM-41 molecular sieves with high thermal and hydrothermal stability, and sharp pore size distribution. However, the structural order and pore sizes are dependent on the carbon chain length. In the mixture surfactant systems, the pore size of the MCM-41 materials could be fine-tuned. The pore size can be extended from 2.5 to 4.5 nm by adding a suitable amount of hydrocarbons. The tubular morphology of the MCM-41 material of 0.3 to 10 micrometers diameter, where the wall consists of coaxial cylindrical pores of nanometers MCM-41, can be obtained by careful control of the surfactant-water content and the rate of condensation of silica. An optimum condition for automatic synthesis of the hierarchical TWT structure has been accomplished. The addition of 1-alkanols as cosurfactant would not only improve the order of the MCM4l hexagonal structure but also promote the formation of micrometer-sized hierarchical materials, for example: tubules- within-tubule and uniform-sized hollow spheres of diameter 5.0 ± 1.0 μm. However, the inside of the micron spheres has intricate structures possessing various topological genus ranks. The MCM-41 is a good supporter for Molybdenum oxide catalysts. The rate of deactivation in the catalytic reaction of ethylbenzene dehydrogenation to styrene increases in the order: M□<M□<SiO□. The physically mixed samples have higher catalytic activity than impregnated ones. |
本系統中英文摘要資訊取自各篇刊載內容。