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从沸石结构扩张，拓扑转换所想到的... Nature 全文赏析 已有4人参与
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近来，Nature 刊文RHO沸石家族接连增添了两个新的成员PST-20，PST-25, 即材料的空间维度扩展来构造新结构的材料~~ Title: A zeolite family with expanding structural complexity and embedded isoreticular structures Authors: Peng Guo,Jiho Shin, Alex G. Greenaway, Jung Gi Min, Jie Su, Hyun June Choi, Leifeng Liu, Paul A. Cox, Suk Bong Hong, Paul A. Wright & Xiaodong Zou Abstract: The prediction and synthesis of new crystal structures enable the targeted preparation of materials with desired properties. Among porous solids, this has been achieved for metal–organic frameworks1, 2, 3, but not for the more widely applicable zeolites4, 5, where new materials are usually discovered using exploratory synthesis. Although millions of hypothetical zeolite structures have been proposed6, 7, not enough is known about their synthesis mechanism to allow any given structure to be prepared. Here we present an approach that combines structure solution with structure prediction, and inspires the targeted synthesis of new super-complex zeolites. We used electron diffraction to identify a family of related structures and to discover the structural ‘coding’ within them. This allowed us to determine the complex, and previously unknown, structure of zeolite ZSM-25 (ref. 8), which has the largest unit-cell volume of all known zeolites (91,554 cubic ångströms) and demonstrates selective CO2 adsorption. By extending our method, we were able to predict other members of a family of increasingly complex, but structurally related, zeolites and to synthesize two more-complex zeolites in the family, PST-20 and PST-25, with much larger cell volumes (166,988 and 275,178 cubic ångströms, respectively) and similar selective adsorption properties. Members of this family have the same symmetry, but an expanding unit cell, and are related by hitherto unrecognized structural principles; we call these family members embedded isoreticular zeolite structures. Download link: http://www.nature.com/nature/jou ... ll/nature14575.html Structure Evolution:  -------------------------------------------------------------------------------------------------------------------------------------------a) 从沸石的构造方式来讲，常见的沸石一般是有基本构筑基元来构筑比如说d4r,d6r，sod, lta 等等..或是近几年比较火的沸石本身的就是二维材料，通过重新引入有机材料还有填充分子进行固化形成空间维度不一的材料比如IPC-1~4，UTL, MWW，FER或是有机无机杂化材料等等...对比这篇文章中的实例似乎有提供了一种从三维空间维度来构造多孔材料的一种新的方法... b) 另外上述文章中得到的材料的孔的开度为8MR，所以此材料用在CO2 分离或是MTO可能有着不错的效果； 欢迎大家拍砖~~~  |
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2015-07-28 20:31:44, 4.17 M
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