Abstract
A new modification strategy using precursors of silanized imidazolium-based room temperature ionic liquids (RTILs) has been developed for surface modification of zeolite membranes by the gentle liquid-phase silanization reaction. The advantage of RTILs in selective adsorption of CO2 could enhance the CO2-selective separation for the RTILs-modified membranes. The parameters, such as the precursor and the anion type of RTILs were optimized. Characterizations including Fourier transform infrared spectroscopy, field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy, showed that silanized imidazolium-based RTILs were grafted on the surface of SSZ-13 crystals and membrane. Carbon dioxide/methane selectivity of the modified membranes was strongly depended on the type of the balanced anion of RTILs. Single-gas permeation for H2, CO2, N2, CH4, C2H6 and i-C4H10 and mixture CO2/CH4 separation through the fresh and modified membranes were investigated. When [TESPMIM][BF4] precursor was used, the average CO2 permeance of three modified membranes decreased by only 44% (average CO2 permeance of 1.0×10−7molm−2s−1Pa−1) and CO2/CH4 selectivity increased by a factor of 7 (average CO2/CH4 selectivity of 87) for an equilmolar CO2/CH4 mixture at room temperature compared with those of the fresh membranes.
Published Version
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