SSZ-13 zeolite membranes on four-channel α-Al2O3 hollow fibers for CO2 separation

SSZ-13 zeolite membranes on four-channel α-Al2O3 hollow fibers for CO2 separation
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用于 CO2 分离的四通道 α-Al2O3 中空纤维上的 SSZ-13 沸石膜

DOI:
10.1016/j.seppur.2021.118611
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发表时间:
2021-07
影响因子:
8.6
通讯作者:
Xuehong Gu
Xuehong Gu
中科院分区:
工程技术1区
文献类型:
--
作者:
Hua Liu;Xuechao Gao;Shengxian Wang;Zhou Hong;Xuerui Wang;Xuehong Gu

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高硅CHA (SSZ-13)沸石膜具有很大的co2分离潜力。但由于投资成本高,实际应用受到很大阻碍。本文在孔径分别为150 nm、370 nm和600 nm的四通道中空纤维上合成了SSZ-13沸石膜。在孔径为150 nm的中空纤维上合成的膜在433 K下作用96 h, CO2/ ch4的选择性为127±11,CO2的渗透率为(3.1±0.6)× 10-7mol m−2s−1Pa−1。单气体渗透定量评价了膜的表面扩散、Knudsen扩散和粘性流动。小分子(如co2和N2)的渗透主要由沸石孔隙贡献,而相对大分子(如CH4)的渗透则对非沸石孔隙更为敏感。对于α co2 / ch4为130和48的膜,非沸石孔隙对ch4渗透率的贡献分别为24.7%和69%。
High-silica CHA (SSZ-13) zeolite membranes exhibit great potential for CO2separation. However, the practical application is significantly hindered by the high investment cost. Here, we synthesized SSZ-13 zeolite membranes on four-channel hollow fibers with pore size of 150 nm, 370 nm and 600 nm, respectively. The CO2/CH4selectivity of 127 ± 11 as well as CO2permeance of (3.1 ± 0.6) × 10-7mol m−2s−1Pa−1was achieved on the membranes synthesized on the hollow fibers with 150 nm pore size at 433 K for 96 h. The single gas permeation was quantitively assigned to evaluate surface diffusion, Knudsen diffusion and viscous flow through the as-synthesized membranes. The permeation of small molecules (e.g., CO2and N2) is mainly contributed by the zeolitic pores, however, the permeation of relatively big molecule (e.g., CH4) is more sensitive to the non-zeolitic pores. For the membranes withαCO2/CH4of 130 and 48, the non-zeolitic pores contributed 24.7% and 69% of CH4permeance, respectively.
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