利用沸石前驅物與 Gemini 界面活性劑合成 含鋁之 MCM-48 中孔洞分子篩;Aluminosilicate MCM-48 mesostructures assembled from dried zeolite precursors and Gemini surfactant

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题名:	利用沸石前驅物與 Gemini 界面活性劑合成含鋁之 MCM-48 中孔洞分子篩;Aluminosilicate MCM-48 mesostructures assembled from dried zeolite precursors and Gemini surfactant
作者:	吳欣茂;Hsin-Mow Wu
贡献者:	化學研究所
关键词:	中孔洞材料;沸石;zeolite;mesoporous
日期:	2004-07-01
上传时间:	2009-09-22 10:12:50 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本實驗已成功地利用乾燥後之 ZSM-5 及 Beta 沸石前驅物與 Gemini 界面活性劑經自我組裝排列的過程，合成出矽鋁比20~∞ 之 MCM-48，所合成的樣品透過各種技術的鑑定，包括粉末 X-ray 繞射、27Al NMR、29Si NMR、傅立葉紅外光光譜、掃描式電子顯微鏡、穿透式電子顯微鏡、氮氣吸脫附儀、感應耦合電漿原子發射光譜儀、催化活性測試和水熱蒸氣測試。結果顯示經由 MFI 及 BEA 沸石前驅物排列而成的 MCM-48 表面積皆可高達1250 m2 g-1以上，而孔徑平均分佈在3.8nm至4.2nm之間。另外經由 MFI 及 BEA 沸石前驅物排列而成之 MCM-48 活性比直接摻鋁之 MCM-48 優越，且水熱蒸氣測試結果也比純矽的 MCM-48 及直接摻鋁的 MCM-48 優秀許多。另外實驗中也發現，只要改變沸石前驅合成之溫度及後來水熱之溫度便可以輕易的控制產物成為 MCM-48 、 MCM-48/ MFI crystals 複合物或是 MFI crystals。 Aluminosilicates with well-ordered MCM-48 mesostructures have been prepared via the assembly of “dried” zeolite precursors with Gemini surfactant. The aluminosilicate MCM-48 materials obtained were characterized by a variety of techniques including powder X-ray diffraction (XRD), 27Al and 29Si magic angle spinning (MAS) NMR, IR, transmission electron microscope (TEM), scanning electron microscope (SEM), nitrogen sorption measurements. The use of Gemini surfactant and the dried zeolite precursor facilitated the incorporation of higher Al contents (Si/Al ratio up to 20) into MCM-48 framework without compromising the integrity of the cubic mesostructure. In comparison to the Al-MCM-48 sample prepared via the direct synthesis, the materials assembled from zeolite precursors showed higher hydrothermal stability and better cumene cracking activities. Although the dried precursors of MFI and BEA zeolites could not be differentiated by all physical measurements made, the catalytic cracking activity of their derived samples did show differences. By varying the temperatures for the preparation of zeolite precursor and for the hydrothermal treatment after surfactant addition, materials ranging from zeolitic MCM-48, zeolite/MCM-48 composite, and pure zeolite nanocrystals could be obtained.
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