Dual-Ion Conducting Lithium Zirconate-Based Membranes for High Temperature CO2 Separation

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Shin-ichi Nakao²  Kazuaki Nakagawa¹  Balagopal N. Nair²  Takeo Yamaguchi²  Hiroto Kawamura² 

[1] Corporate R&D Center, Toshiba Corporation;Department of Chemical System Engineering, University of Tokyo

关键词: CO2 Separation;    Reversible Reaction;    Membrane;    Ionic Diffusion;    Absorption;   

DOI  :  10.1252/jcej.38.322

来源: Maruzen Company Ltd

【 摘 要 】

References(22)Cited-By(17)The processing and characterization of a novel membrane system for CO2 separation is described. The membrane was made of lithium zirconate (Li2ZrO3), which has a potential to react reversibly with CO2 molecules at high temperatures. The reaction of Li2ZrO3 with CO2 essentially produced two electrolyte materials in situ. One of them, Li2CO3, is capable of carrying CO2, and the other, ZrO2, is a well-known O2 ion conductor. This combination of selective reaction and electrolyte conduction permitted the design of a membrane system capable of selective CO2 steady-state permeation across the membrane. Using the membrane, a separation factor of 4.9 was measured between CO2 and CH4 gas molecules at a temperature of 600°C. The measured separation value of 4.9 is very high compared with the Knudsen diffusion limit of 0.6 and therefore clearly supports the use of the membrane system for selective separation of CO2.

【 授权许可】

Unknown