Tailoring pore structure and surface chemistry of microporous Alumina-Carbon Molecular Sieve Membranes (Al-CMSMs) by altering carbonization temperature for optimal gas separation performance: An investigation using low-field NMR relaxation measurements: An investigation using low-field NMR relaxation measurements

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dc.contributor.authorForster, Luke
dc.contributor.authorD'Agostino, Carmine
dc.contributor.authorAnabell Llosa-Tanco, Margot
dc.contributor.authorSpallina, Vincenzo
dc.contributor.authorBrencio, Camilla
dc.contributor.authorGallucci, Fausto
dc.contributor.authorLindley, Matthew
dc.contributor.authorHaigh, Sarah J.
dc.contributor.authorAlfredo Pacheco-Tanaka, David
dc.contributor.institutionTecnalia Research & Innovation
dc.contributor.institutionTECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOS
dc.date.issued2021-11-15
dc.descriptionPublisher Copyright: © 2021 Elsevier B.V.
dc.description.abstractIn this work we applied low-field, NMR spin-lattice measurements to evaluate for the first time the effect of carbonization temperature (range 600 - 1000 ℃) on the preparation of Alumina-Carbon Molecular Sieve Membranes (Al-CMSMs), providing new insights into intra-pore fluid interactions. The results show that the average Al-CMSM pore size generally increases with carbonization temperature whilst the hydrophilicity of the pore surface, and the amount of strongly adsorbed H2O, decreases with an increasing carbonization temperature. As such, lower carbonization temperatures produce more hydrophilic membranes, with further evidence provided by FTIR measurements demonstrating the presence of polar functional groups on the surface, with water interacting more strongly with the membrane surface, as evidenced by NMR. It was found that the Al-CMSM carbonization temperature significantly affected permeance and H2O/CH4 permselectivity by altering the membrane pore size distribution and pore hydrophilicity. H2O permeance values are seen to be up to 100 times larger than respective CH4 permeance values. The greater permeance of H2O is attributed to the larger kinetic diameter of CH4 relative to H2O and the adsorption of water in the hydrophilic pores enhancing the adsorption-diffusion transport mechanism. Optimal water permeation temperatures are thus higher for the more hydrophilic membranes, obtained at lower carbonization temperatures, as more energy is required to remove strongly adsorbed water blocking the pores. At higher carbonization temperatures, the Knudsen diffusion mechanism of permeance dominates over the adsorption-diffusion mechanism thereby reducing permeance as diffusion slows due to collisions between gas molecules and the pore walls. CH4 permeation always occurs via Knudsen diffusion with CH4 permeance increasing with permeation temperature due to the increased rate of CH4 diffusion.en
dc.description.statusPeer reviewed
dc.format.extent1
dc.format.extent2698051
dc.identifier.citationForster , L , D'Agostino , C , Anabell Llosa-Tanco , M , Spallina , V , Brencio , C , Gallucci , F , Lindley , M , Haigh , S J & Alfredo Pacheco-Tanaka , D 2021 , ' Tailoring pore structure and surface chemistry of microporous Alumina-Carbon Molecular Sieve Membranes (Al-CMSMs) by altering carbonization temperature for optimal gas separation performance: An investigation using low-field NMR relaxation measurements : An investigation using low-field NMR relaxation measurements ' , Chemical Engineering Journal , vol. unknown , 129313 , pp. 129313 . https://doi.org/10.1016/j.cej.2021.129313
dc.identifier.doi10.1016/j.cej.2021.129313
dc.identifier.issn1385-8947
dc.identifier.otherresearchoutputwizard: 11556/1095
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85107129783&partnerID=8YFLogxK
dc.language.isoeng
dc.relation.ispartofChemical Engineering Journal
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subject.keywordsCarbon membranes
dc.subject.keywordsWater selective membrane
dc.subject.keywordsLow-field NMR
dc.subject.keywordsNMR relaxation
dc.subject.keywordsCarbon membranes
dc.subject.keywordsWater selective membrane
dc.subject.keywordsLow-field NMR
dc.subject.keywordsNMR relaxation
dc.subject.keywordsGeneral Chemistry
dc.subject.keywordsEnvironmental Chemistry
dc.subject.keywordsGeneral Chemical Engineering
dc.subject.keywordsIndustrial and Manufacturing Engineering
dc.titleTailoring pore structure and surface chemistry of microporous Alumina-Carbon Molecular Sieve Membranes (Al-CMSMs) by altering carbonization temperature for optimal gas separation performance: An investigation using low-field NMR relaxation measurements: An investigation using low-field NMR relaxation measurementsen
dc.typejournal article
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