首页|Hollow SAPO-34 incorporated mixed matrix membranes with the improved solubility selectivity and permeability for N2/CH4 separation
Hollow SAPO-34 incorporated mixed matrix membranes with the improved solubility selectivity and permeability for N2/CH4 separation
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NSTL
Hollow SAPO-34 with an average particle size of ca.370 nm was synthesized by selective etching its precursor under the controlled alkaline condition.Subsequently,freestanding mixed matrix membranes were synthesized by UV-induced in-situ polymerization of the mixture of hollow SAPO-34,the fluorinated monomer,and the trifunctional cross-linker.The structure and the physical characteristic of hollow SAPO-34 and membranes were characterized by scan electron microscope,wide-angle X-ray diffraction,etc.The effect of the hollow SAPO-34 loading amount on the gas permeation-separation performance of mixed matrix membranes was investigated.The results showed that hollowing out SAPO-34 improved the N2/CH4 sorption selectivity and converted the crystals from preferential adsorption of N2 to preferential adsorption of CH4,the incorporation of hollow SAPO-34 into membranes increased the N2/CH4 solubility selectivity and the permeability.The optimal membrane exhibited a 39-fold increase in N2 permeability from 6.9 × 10~(-13)to 2.7 × 10~(-11)cm~3(STP)cm·cm~(-2)·s~(-1)·Pa~(-1)at 0.2 MPa and 35 ℃ without the loss of N2/CH4 permselectivity,which exceeded the 2008 Robeson upper bound.
State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes,Tiangong University,Tianjin,300387,China
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