渗透
材料科学
纳米
膜
热液循环
纳米孔
聚二甲基硅氧烷
热稳定性
气体分离
氢
氢气净化器
化学工程
聚合物
纳米技术
水热合成
制氢
有机化学
化学
渗透
生物化学
工程类
作者
Lingxiang Zhu,Liang Huang,Surendar R. Venna,Adrienne Blevins,Yifu Ding,David Hopkinson,Mark T. Swihart,Haiqing Lin
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-07-13
卷期号:15 (7): 12119-12128
被引量:24
标识
DOI:10.1021/acsnano.1c03492
摘要
Nanoporous silica membranes exhibit excellent H2/CO2 separation properties for sustainable H2 production and CO2 capture but are prepared via complicated thermal processes above 400 °C, which prevent their scalable production at a low cost. Here, we demonstrate the rapid fabrication (within 2 min) of ultrathin silica-like membranes (∼3 nm) via an oxygen plasma treatment of polydimethylsiloxane-based thin-film composite membranes at 20 °C. The resulting organosilica membranes unexpectedly exhibit H2 permeance of 280-930 GPU (1 GPU = 3.347 × 10-10 mol m-2 s-1 Pa-1) and H2/CO2 selectivity of 93-32 at 200 °C, far surpassing state-of-the-art membranes and Robeson's upper bound for H2/CO2 separation. When challenged with a 3 d simulated syngas test containing water vapor at 200 °C and a 340 d stability test, the membrane shows durable separation performance and excellent hydrothermal stability. The robust H2/CO2 separation properties coupled with excellent scalability demonstrate the great potential of these organosilica membranes for economic H2 production with minimal carbon emissions.
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