H2O-enhanced CO2 transport through a proton conducting ceramic- molten carbonate dual-phase membrane
H2O-enhanced CO2 transport through a proton conducting ceramic- molten carbonate dual-phase membrane
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DOI：
10.1016/j.memsci.2022.120421
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发表时间：
2022-05
影响因子：
9.5
通讯作者：
Kangkang Zhang;Shichen Sun;Nansheng Xu;Kevin Huang
中科院分区：
文献类型：
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作者：
Kangkang Zhang;Shichen Sun;Nansheng Xu;Kevin Huang
高温CO2传输和分离膜因其在减缓CO2排放和最终减缓全球变暖/气候变化方面的潜力而引起学术界和工业界的极大兴趣。在本研究中，我们报道了一种由多孔质子导电BaZR0.8Y0.2O3-δ(BZY)基质和低共晶Li2CO3-Na2CO3混合物(简称MC)制备的双相CO2膜。在干、湿条件下，膜在550~750℃温度范围内均表现出较高的CO2渗透通量密度。通过微结构优化，在0.8 mm厚、孔隙率为5 2%、CO2浓度为5 0%的BZY-MC膜上，获得了6 5 0°C时CO2通量密度高达0.34 m L⋅cm−2⋅m in−1和75 0°C时高达0.5 3 m L⋅cm−2⋅m in−1的CO2通量密度.BZY的高磁通量是微观结构、MC载荷量和高体积电导率共同作用的结果。此外，我们还论证了渗透侧H2O对CO2通量密度的正向影响，并提出了H2O增强CO2通量密度的合理机制。在扫气中加入3%的H2O-时，膜的CO2通量密度提高了30%，在650℃下稳定250h以上。
High-temperature membranes for CO 2 transport and separation has attracted significant interest from academia and industries due to their potential to mitigate the emissions of CO 2 and ultimately global warming/climate change. In this study, we report a dual-phase CO 2 membrane fabricated from a porous proton conducting BaZr 0.8 Y 0.2 O 3-δ (BZY) matrix and eutectic mixture of Li 2 CO 3–Na 2 CO 3 (denoted as MC). The membrane exhibits a high CO 2 permeation flux density in the range of 550–750° C in both dry and wet conditions. Through microstructural optimization, a CO 2 flux density as high as 0.34 mL⋅ cm− 2⋅ min− 1 at 650° C and 0.53 mL⋅ cm− 2⋅ min− 1 at 750° C have been achieved with an 0.8 mm thick BZY-MC membrane containing 52% porosity and 50% CO 2–N 2 feed gas. The high flux is attributed to synergistic effects of microstructure, MC loading and high bulk conductivity of BZY. In addition, we also demonstrate the positive effect of H 2 O in the permeate side on CO 2 flux density and proposed a reasonable mechanism to explain the H 2 O-enhanced CO 2 flux density. With 3% H 2 O-added into the sweeping gas, the membrane exhibits 30% CO 2 flux density enhancement and good stability over 250 h at 650° C.