CO2 Permeation through Hybrid Organosilica Membranes in the Presence of Water Vapor

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• 作者：Xiuxiu Ren ; Kanji Nishimoto ; Masakoto Kanezashi ; Hiroki Nagasawa ; Tomohisa Yoshioka ; Toshinori Tsuru
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：6113-6120
• 全文大小：402K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

Hybrid organosilica membranes have become attractive for industrial applications because of high performance and long-term stability. This work investigated the influence of water vapor on CO₂ gas permeation through the hybrid membranes. Two types of organoalkoxysilanes, bis(triethoxysilyl)ethane (BTESE) and bis(triethoxysilyl)octane (BTESO), were used as precursors to prepare membranes via the sol鈥揼el method. The two membranes showed distinct properties of porosity and water affinity because of the differences in the bridging methylene numbers between the two Si atoms. Under dry conditions, the BTESE and BTESO membranes showed CO₂ permeances as high as 7.66 脳 10^鈥? and 6.63 脳 10^鈥? mol m^鈥? s^鈥? Pa^鈥? with CO₂/N₂ selectivities of 36.1 and 12.6 at 40 掳C, respectively. In the presence of water vapor, CO₂ permeance was decreased for both membranes, but the effect of water vapor on CO₂ permeation was slighter for BTESO membranes than it was for BTESE membranes because of more hydrophobicity and denser structures with a longer linking-bridge group. The hybrid organosilica membranes both showed good reproducibility and stability in water vapor.