RT Journal Article
T1 On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes
A1 Cacho-Bailo, Fernando
A1 Matito-Martos, Ismael
A1 Perez-Carbajo, Julio
A1 Etxeberría-Benavides, Miren
A1 Karvan, Oğuz
A1 Sebastián, Víctor
A1 Calero, Sofía
A1 Téllez, Carlos
A1 Coronas, Joaquín
AB Double-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.
SN 2041-6520
YR 2017
FD 2017-07-01
LA eng
NO Cacho-Bailo , F , Matito-Martos , I , Perez-Carbajo , J , Etxeberría-Benavides , M , Karvan , O , Sebastián , V , Calero , S , Téllez , C & Coronas , J 2017 , ' On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes ' , Chemical Science , vol. 8 , no. 1 , pp. 325-333 . https://doi.org/10.1039/c6sc02411d
NO Publisher Copyright: © The Royal Society of Chemistry.
DS TECNALIA Publications
RD 29 sept 2024