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Title: A‐ and B‐site Codoped SrFeO 3 Oxygen Sorbents for Enhanced Chemical Looping Air Separation

Journal Article · · ChemSusChem
 [1];  [1];  [1];  [1];  [2];  [2]; ORCiD logo [1]
  1. Department of Chemical and Biomolecular Engineering North Carolina State University 911 Partners Way Raleigh North Carolina 27695-7905 USA
  2. Department of Mechanical and Aerospace Engineering West Virginia University 1374 Evansdale Drive Morgantown WV 26506 USA

Abstract Chemical‐looping air separation has numerous potential benefits in terms of energy saving and emission reductions. The current study details a combination of density functional theory calculation and experimental efforts to design A‐ and B‐site codoped SrFeO 3 perovskites as “low‐temperature” oxygen sorbents for chemical‐looping air separation. Substitution of the SrFeO 3 host structure with Ca and Co lowers oxygen vacancy formation energy by 0.24–0.46 eV and decreases the oxygen release temperature. As a result, Sr 1− x Ca x Fe 1− y Co y O 3 (SCFC; x= 0.2, 0.0< y <1.0) spontaneously releases oxygen at 400–500 °C even under a relatively high oxygen partial pressure (e.g. P =0.05 atm). Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 exhibits a significantly higher oxygen capacity of 1.2 wt % at 400 °C and under a P swing between 0.05 and 0.2 atm, when compared to the <0.2 wt % capacity for undoped a SrFeO 3 (SF) and Ca‐doped Sr 0.8 Ca 0.2 FeO 3 (SCF). Electrical conductivity relaxation (ECR) study demonstrates that codoping of Ca and Co lowers the activation energy of oxygen diffusion and surface oxygen exchange by 26.6 or 137.9 kJ mol −1 , respectively, resulting in faster redox kinetics for SCFC than for SCF perovskite. The SCFC oxygen sorbent also exhibits excellent stability for 2000 redox cycles for air separation.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0031521
OSTI ID:
1579372
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 2 Vol. 13; ISSN 1864-5631
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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