TY - JOUR
T1 - Room-temperature ionic liquids modified zeolite SSZ-13 membranes for CO2/CH4 separation
AU - Liu, Bo
AU - Zhou, Rongfei
AU - Bu, Na
AU - Wang, Qing
AU - Zhong, Shenglai
AU - Wang, Bin
AU - Hidetoshi, Kita
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - 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 1.0×10−7 mol m−2 s−1 Pa−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.
AB - 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 1.0×10−7 mol m−2 s−1 Pa−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.
KW - CO/CH separation
KW - Room-temperature ionic liquid
KW - Surface modification
KW - Zeolite membrane
UR - http://www.scopus.com/inward/record.url?scp=84995662318&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2016.11.004
DO - 10.1016/j.memsci.2016.11.004
M3 - 文章
AN - SCOPUS:84995662318
SN - 0376-7388
VL - 524
SP - 12
EP - 19
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -