Deca-dodecasil 3 rhombohedral (DDR3) membrane has received much attention in CO2 separation from small gas molecules because of its molecular sieving property and stable characteristics. Therefore, the present work is focusing on the utilization of previously fabricated membrane (synthesized in 3 days as reported in our previous work) to study the effect of hydrocarbons and its durability at the previously optimized conditions. Subsequently, gas permeation study was conducted on the DDR3 membrane in CO2 separation from small gas molecules and it was found that the permeance of H2, CO2, N2, and CH4 decreased in the order of H2 > CO2 > N2 > CH4, according to the increase in kinetic diameter of these gas molecules. Besides, it was observed that the ideal selectivities of the gas pairs decreased in the sequence of CO2/CH4 > CO2/N2 > H2/CO2. On the other hand, it was found that the presence of hydrocarbon impurities in the gas mixture containing CO2 and CH4 has directly affected the performance of DDR3 membrane and contributed to the losses of CO2 permeability, CH4 permeability, and CO2/CH4 selectivity of 39.1%, 14.8%, and 4.2%, respectively. Consequently, from the stability test, the performance of DDR3 membrane remained stable for 96 h, even after the separation testing using CO2 and CH4 gas mixture containing hydrocarbon impurities.

中文翻译：

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使用通过超声辅助水热生长法合成的 Deca-Dodecasil 3 Rhombohedral (DDR3) 膜从小气体分子中分离 CO2

Deca-dodecasil 3 rhombohedral (DDR3) 膜因其分子筛分特性和稳定的特性而在从小气体分子中分离 CO2 中受到广泛关注。因此，目前的工作重点是利用先前制造的膜（如我们先前工作中所报道的在 3 天内合成）来研究碳氢化合物在先前优化条件下的影响及其耐久性。随后，对 DDR3 膜在小分子气体中分离 CO2 进行了气体渗透研究，发现 H2、CO2、N2 和 CH4 的渗透性以 H2 > CO2 > N2 > CH4 的顺序降低，根据这些气体分子的动力学直径增加。此外，观察到气体对的理想选择性按照 CO2/CH4 > CO2/N2 > 氢气/二氧化碳。另一方面，发现含有CO2和CH4的气体混合物中碳氢化合物杂质的存在直接影响了DDR3膜的性能，并导致CO2渗透性、CH4渗透性和CO2/CH4选择性的损失为39.1% 、14.8% 和 4.2%。因此，从稳定性测试来看，即使在使用含有烃类杂质的 CO2 和 CH4 气体混合物进行分离测试后，DDR3 膜的性能仍保持稳定 96 小时。