Functionalized metal‐organic polyhedra hybrid membranes for aromatic hydrocarbons recovery

Abstract

in Wiley Online Library (wileyonlinelibrary.com)Pervaporation membranes are potentially useful in the separation of aromatic/aliphatic mixtures. Wherein, the membrane material plays a key role. Herein, a series of functionalized metal-organic polyhedra (MOPs)/hyperbranched polymer hybrid membranes are molecularly designed and fabricated for the recovery of aromatic hydrocarbons. The isostructural MOP molecules with different functional groups are uniform in shape/size and soluble in solvents, which enable them to disperse well and be compatible in/with the polymer. Pervaporation results demonstrated significant improvements of these membranes in separation performances. Particularly, the membrane with MOP-SO 3 Na n H m showed the separation factor of 8.03 and the permeation flux of 528 g/m 2 h for the recovery of toluene from its 50 wt % n-heptane mixture, and those values are 8.4 and 540 g/m 2 h for benzene/cyclohexane mixture. We propose that the selectivity of these membranes is affected primarily by the polarity of functional groups in MOPs, which were further explained by the adsorption experiments and molecular simulations.

Molecularly Mixed Composite Membranes: Challenges and Opportunities

“…The same class of MOPs have been incorporated into ah yperbranched polymer for pervaporativeseparation of aromatic-aliphatic hydrocarbon mixtures. [61] An increase of flux was observed with increased MOP loading, whereas separation factor appeared to pass through am aximum at 5wt. %M OP.I nt he case of aP TMSP matrix, which has well-known issues with aging,i ncorporation of the MOP was found to provide anti-agingp roperties.…”

Fe‐Beta@CeO2 core‐shell catalyst with tunable shell thickness for selective catalytic reduction of NOx with NH3

“…[17][18][19][20][21] In general, they could bring unique collective and synergetic functions, endowing the CSCs with superior properties than either core or shell material alone. For example, Cargnello et al 22 developed Pd@CeO 2 /Al 2 O 3 CSCs for catalytic methane combustion, which exhibited better catalytic activity than either Pd/CeO 2 or Pd/CeO 2 /Al 2 O 3 due to the presence of interface effect between Pd and CeO 2 during the catalytic process.…”

Advanced Porous Materials in Mixed Matrix Membranes

“…c) Schematic illustration of MOPs with various functional groups. Reproduced with permission . Copyright 2016, American Institute of Chemical Engineers.…”

“…On the contrary, when substituting these SO 3 Na groups with less polar OH groups, MOCs exhibit much weaker capability in improving the membrane selectivity and tend to agglomerate in the membrane even at a loading of only 8 wt%. In a similar manner, Zhao et al synthesized three isostructural functionalized MOP–X [X = SO 3 Na n H m ( n + m = 1), OH, or t Bu], and investigated their performance in MMMs toward aromatic hydrocarbons recovery (Figure c) . Simulation results reveal that the overall binding energies between functional groups in MOCs and toluene molecules follow the sequence of SO 3 Na n H m > OH > t Bu, demonstrating that stronger polar groups possess stronger affinity toward toluene molecules.…”