148634 20250120165542.0 doi 10.1016/j.memsci.2013.10.043 sideral 83301 ART-2014-83301 eng Sorribas, S. Universidad de Zaragoza (orcid)0000-0003-1273-2690 Mixed matrix membranes comprising silica-(ZIF-8) core-shell spheres with ordered meso-microporosity for natural- and biogas upgrading 2014 Mixed matrix membranes (MMMs) containing meso–microporous silica-(ZIF-8) spheres (MSS-Z8) were prepared using polysulfone (PSF) as polymeric matrix, with loadings varying between 0 and 32 wt%. The interaction between the filler and the polymer was studied by scanning electron microscopy and focused ion beam techniques, observing a good dispersion of the filler and an intimate contact between the ZIF-8 crystals shell and the polymeric matrix. X-ray diffraction indicated that the polymeric matrix did not alter the structure of the filler, and suggested the penetration of PSF chains into the flexible pores of the ZIF-8 crystals of the shell. MSS-Z8 MMMs were tested for the separation of CO2/CH4 and H2/CO2 mixtures at different temperatures (35–150 °C) and CO2/CH4 feed compositions. For all equimolar mixtures, the selectivity remained almost constant with the filler content while the permeability increased, the best performance being achieved for 32 wt% MSS-Z8 MMMs with an increase of almost 400% for H2 and 300% for CO2 in comparison with pure PSF. This enhancement in permselectivity resulted in Robeson's 2008 upper bound for H2/CO2 separation being reached when the temperature was increased up to 120 °C. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 5.056 2014 POLYMER SCIENCE 7 / 82 = 0.085 2014 Q1 T1 ENGINEERING, CHEMICAL 7 / 135 = 0.052 2014 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Zornoza, B. (orcid)0000-0002-9934-1707 Téllez, C. Universidad de Zaragoza (orcid)0000-0002-4954-1188 Coronas, J. Universidad de Zaragoza (orcid)0000-0003-1512-4500 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 452 (2014), 184-192 J. membr. sci. JOURNAL OF MEMBRANE SCIENCE 0376-7388 874366 http://zaguan.unizar.es/record/148634/files/texto_completo.pdf Versión publicada 561217 http://zaguan.unizar.es/record/148634/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:148634 articulos driver 2025-01-20-14:54:34 ARTICLE