Synthesis and performance of STT zeolite membranes for He/N2 and He/CH4 separation
Synthesis and performance of STT zeolite membranes for He/N2 and He/CH4 separation
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用于 He/N2 和 He/CH4 分离的 STT 沸石膜的合成与性能
DOI：
10.1016/j.seppur.2022.121927
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发表时间：
2022-08
影响因子：
8.6
通讯作者：
Xuehong Gu
中科院分区：
文献类型：
--
作者：
Chao Gong;Xingyu Peng;Mingyu Zhu;Tao Zhou;Lekai You;Shengyuan Ren;Xuerui Wang;Xuehong Gu
STT分子筛膜是分离He/N_2的最佳分子筛膜之一。一旦合成期超过2天，7条MR通道主导转运途径。·低氦含量可以增加18倍。·膜的性能在长期运行(>；450h)时耐C2H6。从天然气中提取氦(He)由于其氦含量和操作温度极低，能量消耗很大。由于常温操作，对膜气体分离的要求很高。在四通道中空纤维上制备了全硅STT分子筛膜，用于He/N_2和He/CH4的分离。考察了合成时间(1~4d)对膜的质构和分离性能的影响。当合成温度为453K时，7MR和9MR通道均为转运通道，合成周期超过2d后，7MR通道成为主导通道。He对氮气和CH4的尺寸排斥效应比目前的8MR分子筛膜强得多。因此，He/N_2选择性达到25.4，He/CH_4选择性达到87.6。在0.7 Mpa的压力下，对于含0.2%He的模拟气流，He浓度可提高15∼18倍。最重要的是，在含有1mol%乙烷的实际进料中，膜性能稳定可达450h。
STT zeolite membrane is among the best zeolite membranes for He/N 2 separation. 7MR channels dominate transport pathway once synthesis period beyond 2 days. • The low He content could be increased by 18 times. • Membrane performance was resistant to C 2 H 6 for long-term operation (>450 h) Helium (He) extraction from natural gas is energy extensive because of the extremely low He fraction and operating temperature. Membrane gas separation is highly desired because of the atmospheric temperature operation. Herein all-silica STT zeolite membranes were prepared on four-channel hollow fibers for He/N 2 and He/CH 4 separation. The effect of synthesis time (1-4 days) on the membrane texture and separation performance was investigated. Initially both 7MR and 9MR channels served as the transport pathway, however, 7MR channels became the dominated one once the synthesis period beyond 2 days at synthesis temperature of 453 K. The size-exclusion effect of He over N 2 and CH 4 was much stronger than the current 8MR zeolite membranes. Therefore, the He/N 2 selectivity was up to 25.4 and the He/CH 4 selectivity was 87.6. The He concentration could be enhanced by 15∼18 times towards the simulated stream containing 0.2% He at 0.7 MPa. Most importantly, the membrane performance was stable in the practical feed containing 1 mol% ethane for up to 450 h.
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影响因子：
4.7
作者：
Kapteijn, F;Moulijn, JA;Krishna, R
通讯作者：
Krishna, R
影响因子：
4.2
作者：
Xuefeng Zhu;Haibing Wang;Y. S. Lin
通讯作者：
Xuefeng Zhu;Haibing Wang;Y. S. Lin
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影响因子：
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作者：
Liu Bo;Zhou Rongfei;Yogo Katsunori;Kita Hidetoshi
通讯作者：
Kita Hidetoshi
无氟合成用于H2/CH4分离的全硅STT沸石膜
影响因子：
15.1
作者：
Tao Zhou;Mengyang Shi;Lingjie Chen;Chao Gong;Ping Zhang;Jixian Xie;Xuerui Wang;Xuehong Gu
通讯作者：
Xuehong Gu
影响因子：
3
作者：
Koji Kida;Y. Maeta;K. Yogo
通讯作者：
Koji Kida;Y. Maeta;K. Yogo