期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 37, 期 17, 页码 12708-12713出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.06.033
关键词
Hydrogen separation; La0.5Ce0.5O2-delta; Fluorite structure; Mixed electronic and protonic conductor
资金
- National Natural Science Foundation of China [21076204]
- Ministry of Science and Technology of China [2012CB215403]
In this work, highly doped ceria with lanthanum, La0.5Ce0.5O2-delta (LDC), are developed as hydrogen separation membrane material. LDC presents a mixed electronic and protonic conductivity in reducing atmosphere and good stability in moist CO2 environment. LDC separation membranes with asymmetrical structure are fabricated by a cost-saving co-pressing method, using NiO + LDC + corn starch mixture as substrate and LDC as top membrane layer. Hydrogen permeation properties are systemically studied, including the influence of operating temperature, hydrogen partial pressure in feed stream and water vapor in both sides of the membrane on hydrogen permeating fluxes. Hydrogen permeability increases as the increasing of temperature and hydrogen partial pressure in feed gas. Using 20% H-2/N-2 (with 3% of H2O) as feed gas and dry high purity argon as sweep gas, an acceptable flux of 2.6 x 10(-8) mol cm(-2) s(-1) is achieved at 900 degrees C. The existing of water in both sides of membrane has significant effect on hydrogen permeation and the corresponding reasons are analyzed and discussed. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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