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

Markus M Herling; Martin Rieß; Hiroshi Sato; Liangchun Li; Thomas Martin; Hussein Kalo; Ryotaro Matsuda; Susumu Kitagawa; Josef Breu

doi:10.1002/anie.201710717

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

Angew Chem Int Ed Engl. 2018 Jan 8;57(2):564-568. doi: 10.1002/anie.201710717. Epub 2017 Dec 8.

Authors

Markus M Herling¹, Martin Rieß¹, Hiroshi Sato², Liangchun Li³, Thomas Martin¹, Hussein Kalo¹, Ryotaro Matsuda⁴, Susumu Kitagawa³, Josef Breu¹

Affiliations

¹ Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany.
² Department of Chemistry and Biotechnology, School of Engineering The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
³ Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto, 615-8510, Japan.
⁴ Department of Chemistry and Biotechnology, School of Engineering Nagoya University, School of Engineering bldg. 1, Fuoro-cho, Chikusa-ku, Nagoya, 464-8603, Japan.

PMID: 29178514
DOI: 10.1002/anie.201710717

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-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.

Keywords: CO adsorption; gas separation; gate-opening; microporous materials; physisorption.

Publication types

Research Support, Non-U.S. Gov't