Effect of Silica Nanoparticles on Syngas (H2/CO/CO2) Permeability in Polyetherimide Membrane
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1MPRL Lab, Chemical Eng Dep, Amirkabir university, Hafez St, Tehran,Iran
2Iranian Research Organization for Science and Technology (IROST) Ahmadabad Mostoufi, Azadegan Express Way, Tehran, IRAN
As an alternative fuel to fossil fuels, hydrogen has the highest energy density content of all current fuels. Membrane separation is known as one of the effective technologies in hydrogen separation and purification. PEI-silica nanocomposite membranes were synthesized and the permeation of H2, CO and CO2 as the gases produced by the synthesis gas were studied. By embedding a small percentage (5%) of hydrophobic silica in PEI membrane, the permeability of H2, CO2 and CO became 1.5, 1.6 and 1.9 times higher than the permeability of the pure membrane, respectively. Furthermore, at high loads of nanoparticles (20 wt%), H2 permeability reached the level of pure membrane permeability, while CO permeability was significantly reduced. Thus, the selectivity of H2/CO in this membrane reached 66, which is 3.4 times higher than the selectivity of the pure membrane.