In the present work, single channel tubular zeolite CHA membranes with a length of 50 cm and a membrane area of 100 cm² were evaluated by SEM and permeation experiments with single components and industrially relevant humid mixtures. The membranes comprised well-intergrown and smooth CHA films with a thickness of <500 nm supported on the inside of a highly porous tube. For single component permeation, a very low SF₆ permeance of 4.5 × 10⁻¹⁰ mol/(m²‧s‧Pa) was observed, which indicated nearly defect free membranes. On the contrary, the membranes displayed a very high CO₂ permeance of 128 × 10⁻⁷ mol/(m²‧s‧Pa), which illustrated the very high permeability of the CHA pores. Finally, the membranes displayed excellent selectivity for separation of industrially relevant CO₂/CH₄/H₂O mixtures, which was attributed to selective interaction between the CO₂ molecules and the polar water molecules in the pores. The highest observed CO₂/CH₄ separation selectivity was as high as 198 in combination with a CO₂ permeance of 14 × 10⁻⁷ mol/(m²‧s‧Pa) at a feed pressure of 600 kPa (including 2.2 kPa water) and 293K. The corresponding CO₂ flux was 0.39 mol/(m²‧s) and the corresponding CO₂/CH₄ separation factor was 162. The observed membrane performance was reduced by concentration polarisation due to the limited feed flow in the experimental setup. The corresponding selectivity and CO₂ permeance corrected for concentration polarisation were as high as 236 and 16 × 10⁻⁷ mol/(m²‧s‧Pa), and the corrected CO₂ flux was 0.44 mol/(m²‧s) and corrected separation factor was 198. An estimate showed that even at a low feed pressure of 500 kPa, it would be sufficient with as few as 64 membranes for processing of a feed of 100 Nm³/h raw biogas, i.e. the capacity of a typical biogas plant at a large farm, to biomethane with high purity. These results illustrated that the membranes are promising candidates for industrial separation of CO₂ from e.g. natural gas and biogas.

在目前的工作中，长度为 50 厘米、膜面积为 100 厘米^{2 的}单通道管状沸石 CHA 膜通过 SEM 和渗透实验与单一组分和工业相关的潮湿混合物进行了评估。膜由高度多孔管内部支撑的厚度<500 nm 的良好共生和光滑的 CHA 膜组成。对于单组分渗透，观察到非常低的 SF ₆渗透率为 4.5 × 10 ^-10  mol/(m ² ‧s‧Pa)，这表明膜几乎没有缺陷。相反，膜显示出非常高的 CO ₂渗透率，为 128 × 10 ^-7  mol/(m ²‧s‧Pa)，说明CHA孔的渗透性非常高。最后，该膜对工业相关的 CO ₂ /CH ₄ /H ₂ O 混合物的分离表现出优异的选择性，这归因于孔中CO ₂分子和极性水分子之间的选择性相互作用。观察到的最高 CO ₂ /CH ₄分离选择性高达 198，同时 CO ₂渗透率为 14 × 10 ^-7  mol/(m ² ‧s‧Pa)，进料压力为 600 kPa（包括 2.2 kPa 水） ) 和 293K。相应的 CO ₂通量为 0.39 mol/(m ²‧s)，相应的CO ₂ /CH ₄分离因子为162。由于实验装置中进料流量有限，观察到的膜性能因浓差极化而降低。相应的选择性和经浓差极化校正的CO ₂渗透率分别高达 236 和 16 × 10 ^-7  mol/(m ² ‧s‧Pa)，校正后的 CO ₂通量为 0.44 mol/(m ² ‧s) 和校正分离系数为 198。 估计表明，即使在 500 kPa 的低进料压力下，处理 100 Nm ³进料只需 64 个膜就足够了/h 原始沼气，即大型农场的典型沼气厂生产高纯度生物甲烷的能力。这些结果表明，该膜是从例如天然气和沼气中工业分离 CO _{2 的}有希望的候选物。