Oxygen sorption and desorption properties of Sr-Co-Fe oxide

Qinghua Yin, Jay Kniep, Jerry Lin

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

SrCoFeOx has been investigated as a new sorbent for air separation and oxygen removal at high temperatures. X-ray diffraction analysis of a SrCoFeOx sample prepared by liquid citrate method reveals that the sample contains an intergrowth (Sr4 Fe6 - x Cox O13 ± δ), perovskite (SrFe1 - x Cox O3 - δ), and spinel (Co3 - x Fex O4) phase. Both oxygen vacancies (Vover(O, ̈)) and interstitial oxygen ions (Oi ) are involved in the oxygen adsorption and desorption process for SrCoFeOx. Compared with the perovskite-type oxide La0.1 Sr0.9 Co0.9 Fe0.1 O3 - δ, SrCoFeOx has stronger structure stability in a reducing environment and it also exhibits a larger oxygen sorption capacity at temperatures higher than 800 {ring operator} C. Meanwhile, unlike La0.1 Sr0.9 Co0.9 Fe0.1 O3 - δ which shows a fast adsorption rate and a slow desorption rate at 900 {ring operator} C, SrCoFeOx shows a fast desorption rate and slow adsorption rate at the same temperature. X-ray diffraction data reveals that SrCoFeOx samples sintered at 1140 {ring operator} C have a higher amount of the intergrowth phase than samples sintered at 950 {ring operator} C due to slow formation kinetics. X-ray diffraction and thermogravimetric analysis of SrCoFeOx samples prepared by the citrate and solid state method show that the synthesis method strongly influences the amount of the three phases in a sample.

Original languageEnglish (US)
Pages (from-to)2211-2218
Number of pages8
JournalChemical Engineering Science
Volume63
Issue number8
DOIs
StatePublished - Apr 2008

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Oxides
Sorption
Desorption
Oxygen
Adsorption
Citric Acid
Perovskite
X ray diffraction analysis
Oxygen vacancies
Sorbents
Temperature
Thermogravimetric analysis
Ions
X ray diffraction
Kinetics
Liquids
Air
perovskite

Keywords

  • Adsorption
  • Air separation
  • Defect chemistry
  • Mixed-conducting oxides

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Oxygen sorption and desorption properties of Sr-Co-Fe oxide. / Yin, Qinghua; Kniep, Jay; Lin, Jerry.

In: Chemical Engineering Science, Vol. 63, No. 8, 04.2008, p. 2211-2218.

Research output: Contribution to journalArticle

Yin, Qinghua ; Kniep, Jay ; Lin, Jerry. / Oxygen sorption and desorption properties of Sr-Co-Fe oxide. In: Chemical Engineering Science. 2008 ; Vol. 63, No. 8. pp. 2211-2218.
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AB - SrCoFeOx has been investigated as a new sorbent for air separation and oxygen removal at high temperatures. X-ray diffraction analysis of a SrCoFeOx sample prepared by liquid citrate method reveals that the sample contains an intergrowth (Sr4 Fe6 - x Cox O13 ± δ), perovskite (SrFe1 - x Cox O3 - δ), and spinel (Co3 - x Fex O4) phase. Both oxygen vacancies (Vover(O, ̈)) and interstitial oxygen ions (Oi ″) are involved in the oxygen adsorption and desorption process for SrCoFeOx. Compared with the perovskite-type oxide La0.1 Sr0.9 Co0.9 Fe0.1 O3 - δ, SrCoFeOx has stronger structure stability in a reducing environment and it also exhibits a larger oxygen sorption capacity at temperatures higher than 800 {ring operator} C. Meanwhile, unlike La0.1 Sr0.9 Co0.9 Fe0.1 O3 - δ which shows a fast adsorption rate and a slow desorption rate at 900 {ring operator} C, SrCoFeOx shows a fast desorption rate and slow adsorption rate at the same temperature. X-ray diffraction data reveals that SrCoFeOx samples sintered at 1140 {ring operator} C have a higher amount of the intergrowth phase than samples sintered at 950 {ring operator} C due to slow formation kinetics. X-ray diffraction and thermogravimetric analysis of SrCoFeOx samples prepared by the citrate and solid state method show that the synthesis method strongly influences the amount of the three phases in a sample.

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