Purely Physisorption-based CO-Selective Gate-Opening in Microporous Organically Pillared Layered Silicates

Titelangaben

Herling, Markus M. ; Rieß, Martin ; Sato, Hiroshi ; Li, Liangchun ; Martin, Thomas ; Kalo, Hussein ; Matsuda, Ryotaro ; Kitagawa, Susumu ; Breu, Josef:
Purely Physisorption-based CO-Selective Gate-Opening in Microporous Organically Pillared Layered Silicates.
In: Angewandte Chemie International Edition. Bd. 57 (2018) Heft 2 . - S. 564-568.
ISSN 1521-3773
DOI: https://doi.org/10.1002/ange.201710717

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Abstract

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-Dimethly-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. While 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.