High-quality SSZ-13 membranes were synthesized on 200 nm asymmetric α-alumina supports via a single hydrothermal secondary growth. Single CO₂, N₂ and CH₄ permeances and mixed gas separations in CO₂/CH₄ and N₂/CH₄ binary mixtures through SSZ-13 membranes were measured. Synthesis conditions such as membrane substrate, gel composition and membrane calcination were modified. The best SSZ-13 membrane displayed N₂ and CO₂ permeance as high as 8.9 × 10⁻⁸ mol/(m² s Pa) and 5.6 × 10⁻⁷ mol/(m² s Pa) and N₂/CH₄ and CO₂/CH₄ selectivities of 10 and 56.5 for equimolar N₂/CH₄ and CO₂/CH₄ gas mixtures at 298 K and 0.2 MPa feed pressure, respectively. Nitrogen permeance of current SSZ-13 membrane in the mixture was 3.7 times higher than that of our previous SSZ-13 membrane. The membrane synthesis was reproducible. Temperature and pressure dependences of separation performance in the two binary mixtures were also discussed. Single CO₂, N₂ and CH₄ permeances dependent of pressure were predicted by the Maxwell–Stefan diffusion model and the predicted values were fitted well with the measured ones. The stability of SSZ-13 membrane in the wet mixture was investigated. The current SSZ-13 membrane has excellent potentials for CO₂ and N₂ removals from natural gas.

通过单次水热二次生长在 200 nm 不对称 α-氧化铝载体上合成了高质量 SSZ-13 膜。测量了SSZ-13膜的单一CO ₂、N ₂和CH _{4渗透性以及CO 2} /CH ₄和N ₂ /CH ₄二元混合物中的混合气体分离。修改了膜基质、凝胶组成和膜煅烧等合成条件。最好的SSZ-13膜显示N ₂和CO ₂渗透高达8.9 × 10 ^-8  mol/(m ²  s Pa)和5.6 × 10 ^-7  mol/(m ²  s Pa)以及N ₂ /CH ₄和对于等摩尔N ₂ /CH ₄和CO ₂ /CH ₄气体混合物，在298 K和0.2 MPa进料压力下，CO ₂ /CH ₄选择性分别为10和56.5 。当前 SSZ-13 膜在混合物中的氮渗透率比我们之前的 SSZ-13 膜高 3.7 倍。膜合成是可重复的。还讨论了两种二元混合物中分离性能的温度和压力依赖性。通过Maxwell-Stefan扩散模型预测了与压力相关的单一CO ₂、N ₂和CH ₄渗透率，并且预测值与测量值吻合良好。研究了SSZ-13膜在湿混合物中的稳定性。目前的SSZ-13膜在去除天然气中的CO ₂和N _{2方面具有出色的潜力。}