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제목   [15.8월] [NATURE] 홍석봉 교수 연구실 A Zeolite Family with Expanding Structural Complexity and Embedded Isoreticular Structures   이름  관리자
날짜  2015-12-01 11:42:08 조회  1205 추천  0
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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

Journal: Nature

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 metalorganic frameworks, but not for the more widely applicable zeolites, where new materials are usually discovered using exploratory synthesis. Although millions of hypothetical zeolite structures have been proposed, 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, which has the largest unit-cell volume of all known zeolites (91,554 Å3) 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 Å3, 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.


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