75767 20191105115801.0 doi 10.1039/c7ta08778k sideral 104694 ART-2017-104694 eng (orcid)0000-0001-6627-0079 Sánchez-Laínez, J. Universidad de Zaragoza Tuning the separation properties of zeolitic imidazolate framework core-shell structures via post-synthetic modification 2017 Access copy available to the general public Unrestricted The conversion of ZIF-8 into ZIF-7 via post-synthetic modification with benzimidazole has been monitored by quantifying the liberated 2-methylimidazole by chromatography. The reaction kinetics have been adjusted to the shrinking core model, providing the diffusion coefficient of bIm inside the pores and the reaction kinetic constant (2.86 × 10-7 cm2 s-1 and 1.36 × 10-4 cm s-1, respectively). A wide variety of ZIF-7/8 hybrid core-shell frameworks have been obtained during this reaction. The most promising have been characterized by SEM/TEM, TGA, N2 and CO2 adsorption, FTIR and 13C NMR, showing features of the coexistence of both phases inside the frameworks. Their structures have also been simulated, providing comparable XRD and adsorption results. The hybrid material has been used as a filler for PBI mixed matrix membranes (MMMs) applied to H2/CO2 separation, enhancing the performances of the bare PBI polymer and MMMs containing ZIF-8 or ZIF-7 as a filler, with a maximum H2 permeability value of 1921 Barrer and a H2/CO2 selectivity of 11.8. info:eu-repo/grantAgreement/ES/MINECO/MAT2016-77290-R info:eu-repo/grantAgreement/ES/MINECO/CTQ2013-48396-P info:eu-repo/grantAgreement/ES/MINECO/CTP2016-80206-P info:eu-repo/grantAgreement/ES/MINECO/BES-2014-067825 info:eu-repo/grantAgreement/EC/FP7/608490/EU/Energy efficient MOF-based Mixed Matrix Membranes for CO2 Capture/M4CO2 info:eu-repo/grantAgreement/ES/DGA/T05 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 9.931 2017 CHEMISTRY, PHYSICAL 14 / 146 = 0.096 2017 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 20 / 285 = 0.07 2017 Q1 T1 ENERGY & FUELS 6 / 97 = 0.062 2017 Q1 T1 3.488 2017 Chemistry (miscellaneous) 2017 Q1 Renewable Energy, Sustainability and the Environment 2017 Q1 Materials Science (miscellaneous) 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Veiga, A. (orcid)0000-0002-9934-1707 Zornoza, B. Balestra, S.R.G. Hamad, S. Ruiz-Salvador, A.R. Calero, S. (orcid)0000-0002-4954-1188 Téllez, C. Universidad de Zaragoza (orcid)0000-0003-1512-4500 Coronas, J. Universidad de Zaragoza 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5, 48 (2017), 25601-25608 J. mater. chem. A Journal of materials chemistry. A. 2050-7488 444487 http://zaguan.unizar.es/record/75767/files/texto_completo.pdf Postprint 104590 http://zaguan.unizar.es/record/75767/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:75767 articulos driver 2019-11-05-11:51:01 ARTICLE