Purely Physisorption‐Based CO‐Selective Gate‐Opening in Microporous Organically Pillared Layered Silicates

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‐dimen...

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Bibliographic Details
Published in:Angewandte Chemie 2018-01, Vol.130 (2), p.573-577
Main Authors: Herling, Markus M., Rieß, Martin, Sato, Hiroshi, Li, Liangchun, Martin, Thomas, Kalo, Hussein, Matsuda, Ryotaro, Kitagawa, Susumu, Breu, Josef
Format: Article
Language:English
Subjects:
Adsorption
Carbon dioxide
Chemical properties
Chemistry
CO-Adsorption
Freezing
Gastrennung
Gate-Opening
Interlayers
Mikroporöse Materialien
Mopping
Physisorption
Pore size
Pore size distribution
Porosity
Pressure swing adsorption
Separation
Silicates
Size distribution
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Summary: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 CO2 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 N2 by pressure swing adsorption. MOPS (kurz für „microporous organically pillared layered silicates”) sind in der Lage, zwei physikalisch sehr ähnliche Gase, CO und N2, durch eine selektive Porenöffnung zu unterscheiden. „Gate‐Opening“ scheint ein allgemeines Merkmal von MOPS zu sein, wobei die Selektivität einfach über das hochmodulare Design der MOPS eingestellt werden kann.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201710717