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Ionic liquids and eutectic mixtures as solvent and template in synthesis of zeolite analogues

机译:离子液体和低共熔混合物作为合成沸石类似物的溶剂和模板

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摘要

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.
机译:合成多孔材料(1)带来的挑战意味着,新型沸石(沸石)(例如铝硅酸盐沸石(2,3)和沸石类似物(4))与制备已知沸石的新方法(5)一起继续非常重要。通常,这些材料是在自生压力下,在密封的高压釜中以水为溶剂水热制备的(6)。反应混合物通常包括有机模板或“结构导向剂”,其引导合成途径向特定结构发展。在这里,我们报告通过使用离子液体(7)和低共熔混合物(8)来制备铝磷酸盐沸石类似物。基于咪唑鎓的离子液体既充当溶剂又充当模板,从而在不同的实验条件下产生四个zeo型骨架。材料的结构特征可以追溯到所用的溶剂化学。由于离子液体的蒸汽压几乎消失,合成在环境压力下进行,从而消除了与高水热压有关的安全隐患。离子液体也可以再循环以进一步使用。氯化胆碱/脲共晶混合物(8)也用于制备新的分子筛骨架。

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