INOR 690 |
| Mesoporous materials have gathered considerable attention due to their outstanding application to catalyst and separation technology. However, the wall of these materials is normally amorphous. Some surfactants have been chosen to directly synthesize crystalline mesoporous network, which also usually results in partial collapse of porous structures after the extraction of surfactants. Thus, surfactant-free method is tried as an alternative to synthesis of mesoporous materials with a crystalline wall. But few reports about this have been made until now. In this work, mesoporous SnO2 and Al2O3 with crystalline wall were successfully synthesized by a novel surfactant-free method. Complex precursors were synthesized through reaction of metal salts (SnCl4·5H2O, AlCl3·6H2O) and urea in the ethanol thermal process, and then the precursors were calcined to form mesoporous oxide with a crystalline wall. The obtained products were characterized by means of XRD, nitrogen physisorption, TEM, and so on. The results showed that the obtained SnO2 has a high specific surface area (205 m2·g-1) and a narrow pore size distribution (3~9 nm), and the pore wall is composed of nanocrystallites with the particle size of about 3 nm. The obtained Al2O3 also has similar results. These materials with high specific surface area and a crystalline pore wall are expected to improve the performance of metal oxide, and this surfactant-free method can be easily extended to synthesis of other mesoporous metal oxide and will facilitate the industrial production because of its simple process. |
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General
7:00 PM-10:00 PM, Tuesday, 12 September 2006 Moscone Center -- Hall D, Poster
Division of Inorganic Chemistry |