合成及鑑定高水熱穩定性中孔分子篩MCM-41

Synthesis and characterization of mesoporous molecular sieves MCM-41 with high hydrothermal stability

周書賢(Shu-Hsien Chou)

指導教授 ： 鄭吉豐

中原大學/理學院/化學研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300688

摘要

在150 ~ 180℃高溫(不含擴孔劑) 反應時間由1 hour ~ 8 days，合成中孔分子篩，單位經格a0隨者反應時間的增加而變大但變化逐漸趨緩，而孔洞大小在165℃反應2天達到最大值43.6 Å，之後隨著反應時間的增加，孔洞逐漸變小，當反應7天時產生最厚管壁36.1 Å，並做一系列水熱穩定性測試，其水熱穩定度可維持14天以上，其表面積還能維持在水熱前的90﹪，為文獻中所未見，且證明管壁的增厚和水熱穩定性的增加，主要原因為反應時間的延長，但165℃為一關鍵溫度。進而提供一個簡單的合成方法，來改善不易克服的中孔分子篩低水熱穩定度。

關鍵字

水熱穩定性 ； 中孔分子篩

並列摘要

These studies suggest that wall thickness of siliceous MCM-41 can be controlled systematically up to 36.1 Å simply under mild TMAOH concentration at 165℃ for 1 to 7 days.
MCM-41 with the wall thickness of 36.1 Å prepared at 165℃ for 7 days shows outstanding hydrothermal stability. M-165-7d after 7 days of hydrothermal treatment at 100℃ reserves 62﹪of (100) X-ray peak intensity and 90﹪of surface area compared to original M-165-7d. After further hydrothermal treatment for one week, M-165-7d-14d still has 52﹪of (100) X-ray peak intensity and 90﹪of surface area.
It demonstrates remarkable hydrothermal stability of MCM-41 synthesized at this study and facilitates practical applications of mesoporous molecular sieves in future that most mesostructure of calcined MCM-41 with thick wall was retained even after hydrothermal treatment at 100℃ for 14 days.

並列關鍵字

hydrothermal stability ； mesoporous

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