Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/35607
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dc.contributor.authorPacheco, Marlenept_PT
dc.contributor.authorBordonhos, Martapt_PT
dc.contributor.authorSardo, Marianapt_PT
dc.contributor.authorAfonso, Ruipt_PT
dc.contributor.authorR. B. Gomes, Josépt_PT
dc.contributor.authorMafra, Luíspt_PT
dc.contributor.authorPinto, Moisés L.pt_PT
dc.date.accessioned2023-01-04T11:14:41Z-
dc.date.available2023-01-04T11:14:41Z-
dc.date.issued2022-04-07-
dc.identifier.issn1385-8947pt_PT
dc.identifier.urihttp://hdl.handle.net/10773/35607-
dc.description.abstractThe effect of minor amounts of water on the CO2 and CH4 adsorption on primary and secondary amine-functionalised mesoporous silicas (APTES@SBA-15 and DEAPTES@SBA15, respectively) was studied with a combination of high-pressure gas adsorption, solid state NMR of labelled 13CO2 and density functional theory (DFT) calculations. Known amounts of water were pre-adsorbed on the materials (0.047 to 0.157 mmol∙g−1) and the adsorption performance for CO2 and CH4 was compared to the performance of the dry samples. We observed that even when only minor amounts of water are present, the tertiary amine-functionalised material revealed a significant enhancement of the selectivity for CO2 (from ca. 5.8 to 208) while the one with primary amine maintained the same adsorption properties. This is related to the change in the adsorption mechanism in DEAPTES@SBA15 when water is present since water participates in the reaction of the tertiary amine with CO2 to produce bicarbonate (confirmed by NMR and DFT results). Such species was not observed in APTES@SBA-15 with water. From a broader perspective, the results presented in this work are relevant to confirm the suitability of this type of hybrid adsorbents in industrial applications related with CO2 adsorption, where minor amounts of water may be present in the process streams, such as during bio, landfill, or natural gas upgrading, or also in carbon capture applications.pt_PT
dc.language.isoengpt_PT
dc.publisherElsevierpt_PT
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/865974/EUpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50011%2F2020/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50011%2F2020/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04028%2F2020/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04028%2F2020/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQUI-QFI%2F28747%2F2017/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQUI-QFI%2F31002%2F2017/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQEQ-QAN%2F6373%2F2014/PTpt_PT
dc.rightsopenAccesspt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.titleMoisture effect on the separation of CO2/CH4 mixtures with amine-functionalised porous silicaspt_PT
dc.typearticlept_PT
dc.description.versionpublishedpt_PT
dc.peerreviewedyespt_PT
degois.publication.titleChemical Engineering Journalpt_PT
degois.publication.volume443pt_PT
dc.identifier.doi10.1016/j.cej.2022.136271pt_PT
dc.identifier.articlenumber136271pt_PT
Appears in Collections:CICECO - Artigos
DQ - Artigos



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