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dc.contributor.authorCacho-Bailo, Fernando
dc.contributor.authorMatito-Martos, Ismael
dc.contributor.authorPerez-Carbajo, Julio
dc.contributor.authorEtxeberría-Benavides, Miren
dc.contributor.authorKarvan, Oğuz
dc.contributor.authorSebastián, Víctor
dc.contributor.authorCalero, Sofía
dc.contributor.authorTéllez, Carlos
dc.contributor.authorCoronas, Joaquín
dc.date.accessioned2017-03-08T15:07:54Z
dc.date.available2017-03-08T15:07:54Z
dc.date.issued2017
dc.identifier.citationChem. Sci., 2017, 8, 325en
dc.identifier.issn2041-6520en
dc.identifier.urihttp://hdl.handle.net/11556/378
dc.description.abstractDouble-layered zeolitic imidazolate framework (ZIF) membranes were fabricated inside polyimide P84 hollow fibers by a step-synthesis conducted by microfluidic technology and applied to pre-combustion gas separation. Our hypothesis, based on the information provided by a combination of molecular simulation and experiments, is that a CO2 adsorption reduction on the surface of the ZIF-9 would enhance the molecular sieving effect of this ZIF-9 layer and therefore the selectivity in the H-2/CO2 mixture separation of the entire membrane. This reduction would be achieved by means of a less-CO2-adsorptive methylimidazolate-based ZIF-67 or ZIF-8 layer coating the ZIF-9. ZIF-8/ZIF-9 and ZIF-67/ZIF-9 double-layered membranes were prepared and characterized by XRD, FTIR, SEM, FIB, TEM and EDS. This unprecedented strategy led to a H-2/CO2 separation selectivity of 9.6 together with a 250 GPU H-2 permeance at 150 degrees C, showing a significant improvement with respect to the pure ZIF-9 membrane. Double-layered membranes also showed higher apparent CO2 activation energies than single-layered membranes, attributable to a diminished adsorption.en
dc.description.sponsorshipFinancial support (MAT2013-40556-R) from the Spanish MINECO, the Aragon Government (DGA, T05) and the European Social Fund is gratefully acknowledged. We also acknowledge the use of the Servicio General de Apoyo a la Investigacion-SAI (Universidad de Zaragoza). F. C.-B. acknowledges his DGA predoctoral fellowship. V. S. acknowledges the support of the People Program (CIG-Marie Curie Actions, REA grant agreement no. 321642). I. M.-M. thanks the Spanish MINECO for his predoctoral fellowship. The European Research Council through an ERC Grant (ERC2011-StG-279520-RASPA) is also acknowledged. All the microscopy work was done in the Laboratorio de Microscopias Avanzadas at the Instituto de Nanociencia de Aragon (LMA-INA). The authors acknowledge the LMA-INA for offering access to their instruments and expertise.en
dc.language.isoengen
dc.publisherROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDen
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.titleOn the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranesen
dc.typearticleen
dc.identifier.doi10.1039/c6sc02411den
dc.isiYesen
dc.rights.accessRightsopenAccessen
dc.subject.keywordsCARBON-DIOXIDE ADSORPTIONen
dc.subject.keywordsMIXED-MATRIX MEMBRANESen
dc.subject.keywordsCO2 SEPARATIONen
dc.subject.keywordsHYDROGEN SELECTIVITYen
dc.subject.keywordsCOMPOSITE MEMBRANESen
dc.subject.keywordsPHASE-TRANSITIONen
dc.subject.keywordsLINKER SYNTHESISen
dc.subject.keywordsZIF-90 MEMBRANEen
dc.subject.keywordsGAS SEPARATIONen
dc.subject.keywordsHOLLOW-FIBERen
dc.identifier.essn2041-6539en
dc.issue.number1en
dc.journal.titleCHEMICAL SCIENCEen
dc.page.final333en
dc.page.initial325en
dc.volume.number8en


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