Separations

Influence of the preparation methods on the microstructure and oxygen permeability of a CO2-stable dual phase membrane

  1. Huixia Luo1,
  2. Heqing Jiang1,
  3. Konstantin Efimov1,
  4. Jürgen Caro1,*,
  5. Haihui Wang2,*

Article first published online: 17 DEC 2010

DOI: 10.1002/aic.12488

Issue

AIChE Journal

AIChE Journal

Volume 57, Issue 10, pages 2738–2745, October 2011

Additional Information

How to Cite

Luo, H., Jiang, H., Efimov, K., Caro, J. and Wang, H. (2011), Influence of the preparation methods on the microstructure and oxygen permeability of a CO2-stable dual phase membrane. AIChE J., 57: 2738–2745. doi: 10.1002/aic.12488

Author Information

  1. 1

    Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, D-30167 Hannover, Germany

  2. 2

    School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

*Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, D-30167 Hannover, Germany

Publication History

  1. Issue published online: 9 SEP 2011
  2. Article first published online: 17 DEC 2010
  3. Accepted manuscript online: 4 NOV 2010 08:48AM EST
  4. Manuscript Revised: 16 SEP 2010
  5. Manuscript Received: 26 JUL 2010

Funded by

  • China Scholarship Council (CSC)
  • State of Lower Saxony. Grant Number: 21-71023-25-7/09
  • National Natural Science Foundation of China. Grant Numbers: 20706020, U0834004
  • National Basic Research Program of China. Grant Number: 2009CB623406
  • International Joint Project of Guangdong Province Science and Technology. Grant Number: 2009B050700017

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Keywords:

  • homogeneity;
  • dual phase membrane;
  • oxygen separation;
  • CO2-stable

Abstract

A CO2-stable dual phase membrane of the composition 40 wt % NiFe2O4-60 wt % Ce0.9Gd0.1O2-δ (40NFO-60CGO) was synthesized in three different ways: mixing of the starting powders (1) in a mortar and (2) in a ball-mill as well as by (3) direct in situ one-pot sol–gel powder synthesis. Backscattered scanning electron microscopy revealed that the direct one-pot synthesis of 40NFO-60CGO gives the smallest grains in a homogeneous distribution, compared with powder homogenization in the mortar or the ball-mill. The smaller is the grains, the higher is the oxygen permeability. The permeation of the membrane can be improved by coating a porous La0.6Sr0.4CoO3-δ (LSC) layer on the surface of the air side. The dual phase membrane of 40NFO-60CGO prepared by in situ synthesis shows a steady oxygen flux of 0.30 ml/(min cm2) over more than 100 h when pure CO2 was used as sweep gas, which indicated that the dual phases membrane is CO2-resistant at least over this 5 days testing period. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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