Amino-Functionalized SAPO-34 Membranes for CO2/CH4 and CO2/N2 Separation

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• 作者：Surendar R. Venna ; Moises A. Carreon
• 刊名：Langmuir
• 出版年：2011
• 出版时间：March 15, 2011
• 年：2011
• 卷：27
• 期：6
• 页码：2888-2894
• 全文大小：903K
• 年卷期：v.27,no.6(March 15, 2011)
• ISSN：1520-5827

文摘

SAPO-34 seeds and membranes were functionalized with several organic amino cations, such as ethylenediamine, hexylamine, and octylamine. The successful incorporation of the amino groups in the SAPO-34 framework was confirmed by Fourier transform infrared (FTIR) and X-ray photoemission (XPS) spectroscopies. The resultant SAPO-34 membranes were evaluated for the separation of CO₂/CH₄ and CO₂/N₂ gas mixtures. CO₂/CH₄ selectivities as high as 245, with CO₂ permeances of 5 脳 10^鈭? mol m^鈭? s^鈭? Pa^鈭? at 295K and 138 kPa, were observed for an optimum ethylenediamine-functionalized membrane, which corresponded to a 40% increase in the separation index, as compared to the nonfunctionalized SAPO-34 membrane. Similarly, the CO₂/N₂ separation performance was highly improved with the incorporation of ethylenediamine. CO₂/N₂ selectivities as high as 39, with CO₂ permeances of 2.1 脳 10^鈭? mol m^鈭? s^鈭? Pa^鈭? at 295K and 138 kPa, were observed for an optimum ethylenediamine-functionalized membrane, which corresponded to a 167% increase in the separation index, as compared to the nonfunctionalized SAPO-34 membrane.