Ionic liquids and eutectic mixtures as solvent and template in synthesis of zeolite analogues
Ionic liquids and eutectic mixtures as solvent and template in synthesis of zeolite analogues
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DOI：
10.1038/nature02860
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发表时间：
2004-08-26
期刊：
影响因子：
64.8
通讯作者：
Morris, RE
中科院分区：
文献类型：
--
作者：
Cooper, ER;Andrews, CD;Morris, RE
与合成多孔材料（1）相关的挑战意味着新种类的沸石（沸石型）-例如铝硅酸盐沸石（2，3）和沸石类似物（4）-以及制备已知沸石型的新方法（5）仍然非常重要。通常，这些材料是在密封的高压釜中在自生压力下用水作为溶剂水热制备的（6）。反应混合物通常包括有机模板或“结构导向剂”，其将合成途径导向特定结构。本文报道了用离子液体（7）和低共熔混合物（8）制备磷酸铝沸石类似物。咪唑类离子液体同时作为溶剂和模板剂，在不同的实验条件下得到四种沸石骨架。材料的结构特征可以追溯到所使用的溶剂化学。由于离子液体的蒸气压极低，合成在环境压力下进行，消除了与高水热压力相关的安全问题。离子液体也可以再循环用于进一步使用。氯化胆碱/尿素低共熔混合物（8）也用于制备新的沸石型骨架。
The challenges associated with synthesizing porous materials(1) mean that new classes of zeolites (zeotypes)-such as aluminosilicate zeolites(2,3) and zeolite analogues(4)-together with new methods of preparing known zeotypes(5), continue to be of great importance. Normally these materials are prepared hydrothermally with water as the solvent in a sealed autoclave under autogenous pressure(6). The reaction mixture usually includes an organic template or 'structure-directing agent' that guides the synthesis pathway towards particular structures. Here we report the preparation of aluminophosphate zeolite analogues by using ionic liquids(7) and eutectic mixtures(8). An imidazolium-based ionic liquid acts as both solvent and template, leading to four zeotype frameworks under different experimental conditions. The structural characteristics of the materials can be traced back to the solvent chemistry used. Because of the vanishingly low vapour pressure of ionic liquids, synthesis takes place at ambient pressure, eliminating safety concerns associated with high hydrothermal pressures. The ionic liquid can also be recycled for further use. A choline chloride/urea eutectic mixture(8) is also used in the preparation of a new zeotype framework.