Publication result detail

Tubular La0.7Ca0.3Fe0.85Co0.15O3-d Perovskite Membranes, Part II: Performance and Stability

TRUNEC, M.; CIHLÁŘ, J.; DIETHELM, S.; VAN HERLE, J.

Original Title

Tubular La0.7Ca0.3Fe0.85Co0.15O3-d Perovskite Membranes, Part II: Performance and Stability

English Title

Tubular La0.7Ca0.3Fe0.85Co0.15O3-d Perovskite Membranes, Part II: Performance and Stability

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

Oxygen permeability through the tubular La0.7Ca0.3Fe0.85Co0.15O3-d perovskite membrane prepared by thermoplastic extrusion was measured in the temperature range from 800 to 1040 degC in air/argon gradient and compared with oxygen permeability of planar membranes prepared by injection molding and cold isostatic pressing. Oxygen flux through the perovskite membranes was controlled by bulk diffusion of oxygen and was not limited by surface exchange reactions. The oxygen flux through perovskite membranes normalized to 1 mm wall thickness at 900 degC was 0.064 micromol cm-2 s-1. The activation energy of oxygen diffusion was 128 kJ mol-1. The tubular membrane was tested in a reactor for partial oxidation of methane for more than 1900 hours. The oxygen flux decreased gradually during the test from 1.5 to 1 micromol cm-2 s-1. The methane conversion could be adjusted to 83-88%, with the CO selectivity in the same range. After the test a degradation of the perovskite structure of the membrane was observed. A possible mechanism for the phase degradation and segregation was proposed.

English abstract

Oxygen permeability through the tubular La0.7Ca0.3Fe0.85Co0.15O3-d perovskite membrane prepared by thermoplastic extrusion was measured in the temperature range from 800 to 1040 degC in air/argon gradient and compared with oxygen permeability of planar membranes prepared by injection molding and cold isostatic pressing. Oxygen flux through the perovskite membranes was controlled by bulk diffusion of oxygen and was not limited by surface exchange reactions. The oxygen flux through perovskite membranes normalized to 1 mm wall thickness at 900 degC was 0.064 micromol cm-2 s-1. The activation energy of oxygen diffusion was 128 kJ mol-1. The tubular membrane was tested in a reactor for partial oxidation of methane for more than 1900 hours. The oxygen flux decreased gradually during the test from 1.5 to 1 micromol cm-2 s-1. The methane conversion could be adjusted to 83-88%, with the CO selectivity in the same range. After the test a degradation of the perovskite structure of the membrane was observed. A possible mechanism for the phase degradation and segregation was proposed.

Keywords

perovskite, membrane, structure, degradation

Key words in English

perovskite, membrane, structure, degradation

Authors

TRUNEC, M.; CIHLÁŘ, J.; DIETHELM, S.; VAN HERLE, J.

Released

01.01.2006

Publisher

The American Ceramic Society

ISBN

0002-7820

Periodical

JOURNAL OF THE AMERICAN CERAMIC SOCIETY

Volume

89

Number

3

State

United States of America

Pages from

955

Pages to

959

Pages count

5

Full text in the Digital Library

http://hdl.handle.net/

BibTex

@article{BUT42882,
  author="Martin {Trunec} and Jaroslav {Cihlář} and Stefan {Diethelm} and Jan {Van herle}",
  title="Tubular La0.7Ca0.3Fe0.85Co0.15O3-d Perovskite Membranes, Part II: Performance and Stability",
  journal="JOURNAL OF THE AMERICAN CERAMIC SOCIETY",
  year="2006",
  volume="89",
  number="3",
  pages="955--959",
  issn="0002-7820"
}