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Preparation of SSZ-13 membranes with enhanced fluxes using asymmetric alumina supports for N2/CH4 and CO2/CH4 separations
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2018-09-07 , DOI: 10.1016/j.seppur.2018.09.016
Shichao Song , Feng Gao , Yue Zhang , Xinping Li , Ming Zhou , Bin Wang , Rongfei Zhou

High-quality SSZ-13 membranes were synthesized on 200 nm asymmetric α-alumina supports via a single hydrothermal secondary growth. Single CO2, N2 and CH4 permeances and mixed gas separations in CO2/CH4 and N2/CH4 binary mixtures through SSZ-13 membranes were measured. Synthesis conditions such as membrane substrate, gel composition and membrane calcination were modified. The best SSZ-13 membrane displayed N2 and CO2 permeance as high as 8.9 × 10−8 mol/(m2 s Pa) and 5.6 × 10−7 mol/(m2 s Pa) and N2/CH4 and CO2/CH4 selectivities of 10 and 56.5 for equimolar N2/CH4 and CO2/CH4 gas mixtures at 298 K and 0.2 MPa feed pressure, respectively. Nitrogen permeance of current SSZ-13 membrane in the mixture was 3.7 times higher than that of our previous SSZ-13 membrane. The membrane synthesis was reproducible. Temperature and pressure dependences of separation performance in the two binary mixtures were also discussed. Single CO2, N2 and CH4 permeances dependent of pressure were predicted by the Maxwell–Stefan diffusion model and the predicted values were fitted well with the measured ones. The stability of SSZ-13 membrane in the wet mixture was investigated. The current SSZ-13 membrane has excellent potentials for CO2 and N2 removals from natural gas.



中文翻译:

使用不对称氧化铝载体制备具有增强通量的 SSZ-13 膜,用于 N2/CH4 和 CO2/CH4 分离

通过单次水热二次生长在 200 nm 不对称 α-氧化铝载体上合成了高质量 SSZ-13 膜。测量了SSZ-13膜的单一CO 2、N 2和CH 4渗透性以及CO 2 /CH 4和N 2 /CH 4二元混合物中的混合气体分离。修改了膜基质、凝胶组成和膜煅烧等合成条件。最好的SSZ-13膜显示N 2和CO 2渗透高达8.9 × 10 -8  mol/(m 2  s Pa)和5.6 × 10 -7  mol/(m 2  s Pa)以及N 2 /CH 4和对于等摩尔N 2 /CH 4和CO 2 /CH 4气体混合物,在298 K和0.2 MPa进料压力下,CO 2 /CH 4选择性分别为10和56.5 。当前 SSZ-13 膜在混合物中的氮渗透率比我们之前的 SSZ-13 膜高 3.7 倍。膜合成是可重复的。还讨论了两种二元混合物中分离性能的温度和压力依赖性。通过Maxwell-Stefan扩散模型预测了与压力相关的单一CO 2、N 2和CH 4渗透率,并且预测值与测量值吻合良好。研究了SSZ-13膜在湿混合物中的稳定性。目前的SSZ-13膜在去除天然气中的CO 2和N 2方面具有出色的潜力。

更新日期:2018-09-07
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