Cerium-containing MCM-41 materials as selective acylation and alkylation catalysts
Cerium-containing MCM-41 materials as selective acylation and alkylation catalysts
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DOI：
10.1016/j.cattod.2004.07.009
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发表时间：
2004-11
期刊：
影响因子：
5.3
通讯作者：
M. D. Kadgaonkar;S. Laha;R. Pandey;P. Kumar;S. P. Mirajkar;R. Kumar
中科院分区：
文献类型：
--
作者：
M. D. Kadgaonkar;S. Laha;R. Pandey;P. Kumar;S. P. Mirajkar;R. Kumar
采用常压下磁力搅拌将凝胶回流24-36h，水热法合成Ce-MCM-41、Al-MCM-41和ce - Al-MCM-41型介孔材料。对样品进行了全面的表征，以获得结构和织构性能，表明存在有序的m41s型材料。Ce-MCM-41样品用于醇类、硫醇类、酚类和胺类的催化酰化，具有良好的活性和选择性，对双功能化合物的选择性单功能酰化具有较高的化学选择性。非常重要的是，使用Ce-MCM-41作为固体催化剂，可以实现胆固醇、ergesterol和β-谷甾醇等大分子的酰化。Ce和Al在Ce - Al - mcm -41中的存在具有协同效应，Ce - Al - mcm -41样品比Si/Al或Si/Ce摩尔比相当的Ce - Al - mcm -41或Al - mcm -41样品对萘的烷基化反应更有效。
The synthesis of Ce–MCM-41, Al–MCM-41 and Ce–Al–MCM-41-type mesoporous materials was carried out hydrothermally by refluxing the gel with magnetic stirring under atmospheric pressure for 24–36h. The samples were characterized thoroughly in order to obtain the structural and textural properties, which reveal the presence of well-ordered M41S-type materials. The Ce–MCM-41 samples were used for catalytic acylation of alcohols, thiols, phenols and amines show good activity and selectivity including high chemoselectivity towards selective monofunctional acylation of bifunctional compounds. Quite importantly the acylation of bulky molecules such as cholesterol, ergesterol and β-sitosterol could be achieved using Ce–MCM-41 as solid catalyst. The presence of Ce along with Al in Ce–Al–MCM-41 was found to have synergistic effect as Ce–Al–MCM-41samples were more active catalysts for alkylation of naphthalene compared to either Ce–MCM-41 or Al–MCM-41 with comparable Si/Al or Si/Ce molar ratio.