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|Title:||Thermal and hydrothermal stability of framework-substituted MCM-41 mesoporous materials|
|Authors:||Chen, L.Y. |
|Source:||Chen, L.Y.,Jaenicke, S.,Chuah, G.K. (1997). Thermal and hydrothermal stability of framework-substituted MCM-41 mesoporous materials. Microporous Materials 12 (4-6) : 323-330. ScholarBank@NUS Repository.|
|Abstract:||The thermal and hydrothermal stability of framework-substituted MCM-41 with a Si/M molar ratio of 40 (M = Al, Ti) is assessed. Si-MCM-41 with 2.5% substitution of Si by either Al or Ti remains mesoporous when calcined in air at temperatures up to 800°C. The pore structure of Si-MCM-41 and Al-MCM-41 collapses at a calcination temperature of above 800°C, while pore collapse occurs at about 100°C higher for Ti-MCM-41. The addition of La2O3 to Al-MCM-41 improves its thermal stability at lower temperatures, but has no effect at higher temperatures. When MCM-41 materials are treated in pure distilled water at 25-100°C for 4 h, Si-MCM-41 suffers a significant loss of BET surface area, while Al-MCM-41 and Ti-MCM-41 are more stable towards such treatment. All the samples investigated are stable in an acidic solution of pH 2, but disintegrate rapidly in a strongly basic medium (pH 12). © 1997 Elsevier Science B.V.|
|Source Title:||Microporous Materials|
|Appears in Collections:||Staff Publications|
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