Direct, efficient and selective capture of low concentration of CO2 from natural gas flue gas using a high temperature tubular carbon capture membrane
2022
Sun, Shichen | Billings, Aidan | Zhang, Kangkang | Huang, Kevin
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 CO₂ capture/separation/conversion have been demonstrated with great potential to meet this challenge. In this study, we report on the CO₂ capture 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 cm² effective surface area) can achieve a CO₂ flux density of 0.46–0.55 mL/min·cm² at 650 °C, capturing 97% pure CO₂ at a rate of 37–42% from 5%CO₂–N₂ using moistened Ar as the sweep gas. The level of performance demonstrated by this study suites the membrane well for stationary CO₂ capture from NG power plants.
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