Direct, efficient and selective capture of low concentration of CO2 from natural gas flue gas using a high temperature tubular carbon capture membrane
Direct, efficient and selective capture of low concentration of CO2 from natural gas flue gas using a high temperature tubular carbon capture membrane
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DOI：
10.1016/j.memsci.2022.120929
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发表时间：
2022-08
影响因子：
9.5
通讯作者：
Shichen Sun;Aidan Billings;Kangkang Zhang;Kevin Huang
中科院分区：
文献类型：
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作者：
Shichen Sun;Aidan Billings;Kangkang Zhang;Kevin Huang
燃用天然气(NG)的发电厂排放的二氧化碳浓度较低(4-5%)，这给当前的基准胺吸收技术带来了额外的技术和经济挑战。新出现的基于熔融碳酸盐(MC)化学的高温多相膜用于二氧化碳的捕获/分离/转化被证明具有巨大的潜力来应对这一挑战。在这项研究中，我们报告了这种膜在管状几何形状下从模拟天然气烟气中捕获二氧化碳的性能。膜由Gd0.20Ce0.80O1.95(GDC)和MC的混合物组成，其中GDC形成一个含有MC的多孔骨架。结果表明，外径为6.1 mm、内径为5.1 mm、有效长度为5 cm(有效比表面积为4cm2)的膜在650℃时可获得0.46~0.55 cm/min·cm2的CO_2通量密度，以湿Ar为扫气从5%的CO_2-N_2中捕集97%的纯CO_2。这项研究展示的性能水平非常适合于从天然气发电厂捕获固定二氧化碳的膜。
Natural gas (NG) fired power plants emit low concentration (4–5%) of CO2, which presents additional technical and economic challenges to the current benchmark amine absorption technology. The newly emerged high-temperature multiphase membranes operated on molten carbonate (MC) chemistry for CO2capture/separation/conversion have been demonstrated with great potential to meet this challenge. In this study, we report on the CO2capture performance of such a membrane in tubular geometry from a mockup NG flue gas. The membrane is comprised of a mixture of Gd0.20Ce0.80O1.95(GDC) and MC, in which GDC forms a porous skeleton to contain MC. We show that the membrane with a dimension of 6.1 mm in outer diameter, 5.1 mm in inner diameter and 5 cm in effective length (resulting in 4 cm2effective surface area) can achieve a CO2flux density of 0.46–0.55 mL/min·cm2at 650 °C, capturing 97% pure CO2at a rate of 37–42% from 5%CO2–N2using moistened Ar as the sweep gas. The level of performance demonstrated by this study suites the membrane well for stationary CO2capture from NG power plants.