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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DOI：
10.1016/j.micromeso.2022.112100
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发表时间：
2022
影响因子：
5.2
通讯作者：
Yuzhong Zhang
中科院分区：
文献类型：
--
作者：
Xiaoli Ding;Yongfu Tang;Hongyong Zhao;Qingping Xin;Yuzhong Zhang
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 N 2 /CH 4 sorption selectivity and converted the crystals from preferential adsorption of N 2 to preferential adsorption of CH 4 , the incorporation of hollow SAPO-34 into membranes increased the N 2 /CH 4 solubility selectivity and the permeability. The optimal membrane exhibited a 39-fold increase in N 2 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 °C without the loss of N 2 /CH 4 permselectivity, which exceeded the 2008 Robeson upper bound. • Hollow SAPO-34 was synthesized and used as fillers to prepare MMMs. • Free-standing MMMs were prepared by in-situ polymerization for N 2 /CH 4 separation. • Cross-linked fluoropolymer worked well as the matrix with good contact with SAPO-34. • Hollowing out of SAPO-34 increased the N 2 /CH 4 sorption selectivity. • MMMs exhibited 39-fold enhanced N 2 permeability without loss of selectivity.
