Asymmetric Thin Samarium Doped Cerium Oxide鈥揅arbonate Dual-Phase Membrane for Carbon Dioxide Separation

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• 作者：Bo Lu ; Y. S. Lin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：53
• 期：34
• 页码：13459-13466
• 全文大小：467K
• ISSN：1520-5045

文摘

Samarium doped ceria (SDC)鈥揷arbonate dual-phase membranes are permselective to carbon dioxide. This paper reports a method to prepare thin SDC鈥揷arbonate membranes on an adequate base support to improve CO₂ permeance of the membranes. It was found that macroporous support made of a physical mixture of SDC and 40 vol % bismuth鈥搚ttrium鈥搒amarium oxide (BYS) has the desired pore structure, ionic conductivity, carbonate nonwettability, and mechanical compatibility with the thin SDC鈥揷arbonate membrane layer. Asymmetric porous supports consisting of a thin, porous SDC top layer on an SDC鈥揃YS base were prepared by the copressing method. The porous SDC top layer was filled with molten carbonate by the direct infiltration method. The final membranes consist of a 150 渭m, hermetic SDC鈥揷arbonate layer on the macroporos SDC鈥揃YS base support. The thin SDC鈥揷arbonate dual-phase membrane offers significantly improved CO₂ permeance as compared to thick SDC鈥揷arbonate membranes. Both membrane thickness and the structure of the SDC phase affect CO₂ permeance. The thin SDC鈥揷arbonate membranes exhibit CO₂ flux of 1.33 脳 10up>鈥?up>鈥?.55 脳 10up>鈥?up> mol/s/mup>2up> at 550鈥?00 掳C, with steady state operation for at least 160 h. The CO₂ permeation flux is related to upstream and downstream CO₂ partial pressures by a power law, consistent with the theoretical model.