A transient TGA study on oxygen permeation properties of perovskite-type ceramic membrane

Y. Zeng, Jerry Lin

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

This paper reports transient weight curves of La0.2Sr0.8CoO3-δ (LSC) membrane (crashed in small grains) subject to an instantaneous change of oxygen activity in the gas phase. When the surrounding gas changes between pure oxygen and helium, the LSC sample experiences a slow weight loss in the oxygen desorption period and a rapid weight gain in the oxygen absorption period due mainly to the difference in the driving force. The LSC sample undergoes phase transformation/chemical reaction with the surrounding gas changing between the pure oxygen and methane. A mathematical model considering surface reaction as the rate-limiting step is presented to describe the oxygen transport through the membrane material, and employed to obtain the surface reaction rate constants. A simple correlation between the oxygen permeation flux and rate constants measured by the transient thermogravimetric analysis (TGA) method is given. The oxygen permeation fluxes calculated from the data measured by the present TGA method are consistent with the data measured by the permeation method. The TGA method is found particularly useful for studying the surface reaction rates of oxygen permeation through thin mixed-conducting ceramic membranes.

Original languageEnglish (US)
Pages (from-to)209-221
Number of pages13
JournalSolid State Ionics
Volume110
Issue number3-4
StatePublished - Jul 2 1998
Externally publishedYes

Fingerprint

Ceramic membranes
Permeation
Perovskite
Thermogravimetric analysis
ceramics
Oxygen
membranes
oxygen
Surface reactions
surface reactions
Gases
Reaction rates
Rate constants
reaction kinetics
Fluxes
Membranes
perovskite
Helium
Methane
gases

Keywords

  • Ceramic membranes
  • Gravimetric measurements
  • Oxygen permeation
  • Permeation model
  • Surface reactions

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

A transient TGA study on oxygen permeation properties of perovskite-type ceramic membrane. / Zeng, Y.; Lin, Jerry.

In: Solid State Ionics, Vol. 110, No. 3-4, 02.07.1998, p. 209-221.

Research output: Contribution to journalArticle

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