title: Flue-gas and direct-air capture of CO2 by porous metal-organic materials.
abstract: Sequestration of CO2, either from gas mixtures or directly from air (direct air capture), is a technological goal important to large-scale industrial processes such as gas purification and the mitigation of carbon emissions. Previously, we investigated five porous materials, three porous metal-organic materials (MOMs), a benchmark inorganic material, ZEOLITE 13X: and a chemisorbent, TEPA-SBA-15: , for their ability to adsorb CO2directly from air and from simulated flue-gas. In this contribution, a further 10 physisorbent materials that exhibit strong interactions with CO2have been evaluated by temperature-programmed desorption for their potential utility in carbon capture applications: four hybrid ultramicroporous materials, SIFSIX-3-CU: , DICRO-3-NI-I: , SIFSIX-2-CU-I: and MOOFOUR-1-NI: ; five microporous MOMs, DMOF-1: , ZIF-8: , MIL-101: , UIO-66: and UIO-66-NH2: ; an ultramicroporous MOM, NI-4-PYC: The performance of these MOMs was found to be negatively impacted by moisture. Overall, we demonstrate that the incorporation of strong electrostatics from inorganic moieties combined with ultramicropores offers improved CO2capture performance from even moist gas mixtures but not enough to compete with chemisorbents.This article is part of the themed issue 'Coordination polymers and metal-organic frameworks: materials by design'.
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: David G
authors.identifier: http://orcid.org/0000-0003-3875-9146
authors.initials: DG
authors.lastname: Madden
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Hayley S
authors.identifier: http://orcid.org/0000-0001-9586-196X
authors.initials: HS
authors.lastname: Scott
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Amrit
authors.identifier: http://orcid.org/0000-0002-6329-4582
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Kai-Jie
authors.identifier: http://orcid.org/0000-0001-7581-6571
authors.initials: KJ
authors.lastname: Chen
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Rana
authors.identifier: http://orcid.org/0000-0003-4813-9987
authors.initials: R
authors.lastname: Sanii
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Alankriti
authors.identifier: http://orcid.org/0000-0002-7139-8031
authors.initials: A
authors.lastname: Bajpai
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Matteo
authors.identifier: http://orcid.org/0000-0002-9067-7802
authors.initials: M
authors.lastname: Lusi
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland teresa.curtin@ul.ie.|Materials and Surface Science Institute (MSSI), Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Teresa
authors.identifier: http://orcid.org/0000-0003-4349-4525
authors.initials: T
authors.lastname: Curtin
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: John J
authors.identifier: http://orcid.org/0000-0001-9393-5451
authors.initials: JJ
authors.lastname: Perry
authors.affiliation: Bernal Institute, Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland michael.zaworotko@ul.ie.|Materials and Surface Science Institute (MSSI), Department of Chemical Sciences, University of Limerick, Plassey House, Castletroy, Limerick, Republic of Ireland.
authors.forename: Michael J
authors.identifier: http://orcid.org/0000-0002-1360-540X
authors.initials: MJ
authors.lastname: Zaworotko
keywords: adsorption; physisorption; temperature-programmed desorption; ultramicroporous