用为支的SAPO-34膜用于CO2/CH4分离
Moises A Carreon1, Shiguang Li, John L Falconer
1Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424, USA.
Journal of the American Chemical Society
|April 2, 2008
概括
具有可控制晶体大小的SAPO-34膜提供了卓越的CO2/CH4分离. 较小的种子 (<1微米) 产生高选择性和前所未有的二氧化碳透性,用于高效的气体分离应用.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 分离技术 分离技术
背景情况:
- 有效地将二氧化碳 (CO2) 与甲 (CH4) 分离,对于天然气净化和碳捕获至关重要.
- 现有的分离方法经常面临选择性,透性或运营成本的挑战.
研究的目的:
- 开发高性能的SAPO-34膜,以实现有效的CO2/CH4分离.
- 为了研究种子晶体大小对膜分离特性的影响.
主要方法:
- 在alpha-Al2O3支上SPO-34的现场结晶.
- 使用各种结构指导剂 (0.7-8.5微米) 控制SAPO-34种子晶体大小.
- 对CO2/CH4混合物进行气体透和选择性测量.
主要成果:
- 用小于1微米的种子晶体制造的SAPO-34膜表现出超过170的CO2/CH4选择性.
- 在295K和224kPa时,达到高达2.0 x 10(-6) mol/m2.s.Pa的前所未有的CO2透率.
- 证明了CO2/CH4混合物的有效分离达到了1.7 MPa.
结论:
- 控制SAPO-34种子晶体大小是优化CO2/CH4分离膜性能的一个关键因素.
- 开发的膜显示了在气体净化和碳捕获方面的工业应用的巨大潜力.
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