Preparation of KAUST-8 membranes by hydrothermal secondary growth method for H2/CO2 separation
KAUST-8 nanosheets exhibit high surface area and pore volume,leading to exceptional CO2 adsorption due to Al metal sites.In this study,polycrystalline KAUST-8 membranes were developed using a hydrothermal secondary growth technique on coarse microporous α-Al2O3 tube supports,employing aluminum oxide and nickel nitrate precursors.Al2O3 was to control the growth of inorganic pillar[AlF5(H2O)]2-and Ni(NO3)2·6H2O for its enhanced solubility of precursor nickel sources,to form Ni(Ⅱ)-pyrazine square grids which reacted with the pillar to grow KAUST-8 crystals.Additionally,water was used as a solvent to promote membrane growth.Moreover,the synthesis conditions of reactant concentration,time,temperature,and effects of solvents were explored.The resulting optimized KAUST-8 membrane demonstrated H2 permeance rate of 1.27×10-7 mol/(m2·s·Pa)(at 25 ℃ and 0.1 MPa)and ideal selectivity of H2/CO2 of 19.3.
CO2 separationKAUST-8 membranesfluorinated MOF membraneshydrothermal synthe-sisH2 purification
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