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Perovskite oxide absorbents for oxygen separation
Author(s) -
He Yufeng,
Zhu Xuefeng,
Li Qiming,
Yang Weishen
Publication year - 2009
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11931
Subject(s) - oxygen , desorption , analytical chemistry (journal) , absorption (acoustics) , chemistry , partial pressure , oxide , thermogravimetric analysis , titration , oxygen storage , iodometry , atmospheric temperature range , ionic radius , perovskite (structure) , solid oxygen , ion , inorganic chemistry , materials science , thermodynamics , crystallography , adsorption , chromatography , physics , organic chemistry , composite material
The fixed‐bed oxygen absorption processes of the series of Ba 1−x Sr x Co 0.8 Fe 0.2 O 3−δ oxides were studied by oxygen partial pressure swing absorption in the temperature range of 300–850°C. The results show that SrCo 0.8 Fe 0.2 O 3−δ , with the smallest A‐site ion radius, has the largest oxygen absorption capacity (0.402 mmol/g) at 500°C. The oxygen absorption and desorption kinetics fit well with the pseudo‐second‐order kinetics model. Comparing the modeling absorption rate coefficient k 2 with the desorption rate coefficient k 2 ′, all the oxides studied had higher oxygen absorption rates than oxygen desorption ones. In addition, the combined results of X‐ray diffraction analysis, O 2 ‐TPD, room temperature iodometric titration, and thermogravimetric analysis explained the relationship between the oxygen absorption capacities and the average radii of the A‐site ions for this series of Ba 1−x Sr x Co 0.8 Fe 0.2 O 3−δ in the temperature range of 300–600°C. © 2009 American Institute of Chemical Engineers AIChE J, 2009