Chemical looping air separation is a promising technology for oxygen production from air with less energy consumption and CO2 emission. The current study focuses on designing A and B-site co-doped SrFeO3 perovskites as “low temperature” oxygen sorbents for chemical looping air separation. Combining density functional theory calculation and experimental efforts, it is found that substitution of the SrFeO3 host structure with Ca and Co lowers oxygen vacancy formation energy by 0.24-0.46 eV and decreases the oxygen release temperature. The resulted Sr1-xCaxFe1-yCoyO3 (SCFC) sorbent spontaneously releases oxygen at 400-500 oC even under a relatively high oxygen partial pressure (e.g. PO2 = 0.05 atm). SCFC oxygen sorbents exhibit a significantly higher oxygen capacity of 1.0-1.5 w.t.% at 400-500 °C, when compared to the &lt;0.2 w.t.% capacity for un-doped SrFeO3 perovskite. Electrical conductivity relaxation (ECR) study demonstrates co-doping of Ca and Co lowers activation energy of oxygen diffusion and surface oxygen exchange by 26.6 and 137.9 kJ/mol accordingly, resulting in fast redox kinetics of SCFC comparing to SCF perovskite. The SCFC oxygen sorbent also exhibits excellent stability for up to 2000 redox cycling for air separation in the presence of 1-10% steam.

“Low temperature” perovskite oxygen sorbents for chemical looping air separation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.