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Purely Physisorption‐Based CO‐Selective Gate‐Opening in Microporous Organically Pillared Layered Silicates
Author(s) -
Herling Markus M.,
Rieß Martin,
Sato Hiroshi,
Li Liangchun,
Martin Thomas,
Kalo Hussein,
Matsuda Ryotaro,
Kitagawa Susumu,
Breu Josef
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201710717
Subject(s) - microporous material , physisorption , molecule , superstructure , adsorption , materials science , octane , chemical engineering , nanotechnology , chemistry , chemical physics , organic chemistry , composite material , thermodynamics , engineering , physics
Separation of gas molecules with similar physical and chemical properties is challenging but nevertheless highly relevant for chemical processing. By introducing the elliptically shaped molecule, 1,4‐dimethyl‐1,4‐diazabicyclo[2.2.2]octane, into the interlayer space of a layered silicate, a two‐dimensional microporous network with narrow pore size distribution is generated (MOPS‐5). The regular arrangement of the pillar molecules in MOPS‐5 was confirmed by the occurrence of a 10 band related to a long‐range pseudo‐hexagonal superstructure of pillar molecules in the interlayer space. Whereas with MOPS‐5 for CO 2 adsorption, gate‐opening occurs at constant volume by freezing pillar rotation, for CO the interlayer space is expanded at gate‐opening and a classical interdigitated layer type of gate‐opening is observed. The selective nature of the gate‐opening might be used for separation of CO and N 2 by pressure swing adsorption.