J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic.
EaStCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, UK.
Nat Chem. 2016 Jan;8(1):58-62. doi: 10.1038/nchem.2374. Epub 2015 Oct 26.
Zeolites are porous aluminosilicate materials that have found applications in many different technologies. However, although simulations suggest that there are millions of possible zeolite topologies, only a little over 200 zeolite frameworks of all compositions are currently known, of which about 50 are pure silica materials. This is known as the zeolite conundrum--why have so few of all the possible structures been made? Several criteria have been formulated to explain why most zeolites are unfeasible synthesis targets. Here we demonstrate the synthesis of two such 'unfeasible' zeolites, IPC-9 and IPC-10, through the assembly-disassembly-organization-reassembly mechanism. These new high-silica zeolites have rare characteristics, such as windows that comprise odd-membered rings. Their synthesis opens up the possibility of preparing other zeolites that have not been accessible by traditional solvothermal synthetic methods. We envisage that these findings may lead to a step change in the number and types of zeolites available for future applications.
沸石是多孔的硅铝酸盐材料，已在许多不同的技术中得到应用。然而，尽管模拟表明沸石可能存在数百万种拓扑结构，但目前仅知道约 200 种不同组成的沸石骨架，其中约 50 种是纯二氧化硅材料。这就是沸石之谜——为什么只有少数的可能结构被合成出来？已经制定了几个标准来解释为什么大多数沸石都是不可行的合成目标。在这里，我们通过组装-解组装-组织-再组装机制展示了两种这样的“不可行”沸石，IPC-9 和 IPC-10 的合成。这些新的高硅沸石具有罕见的特征，例如由奇数个环组成的窗口。它们的合成开辟了制备其他通过传统溶剂热合成方法无法获得的沸石的可能性。我们设想，这些发现可能会使未来应用的沸石数量和类型发生重大变化。
