Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O 2 Releasing Behavior of La 1?x Ca x Co 1?y Fe y O 3?? Perovskites

Qiuwan Shen, Shian Li, Guogang Yang, Bengt Sunden and Jinliang Yuan
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Qiuwan Shen: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Shian Li: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Guogang Yang: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Bengt Sunden: Department of Energy Sciences, Lund University, 22100 Lund, Sweden
Jinliang Yuan: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China

Energies, 2019, vol. 12, issue 3, 1-11

Abstract: Oxy-fuel combustion is one of the proposed technologies with the potential to achieve zero CO 2 emission. La 1−x Ca x Co 1−y Fe y O 3−δ (LCCF) perovskites are promising materials with high selectively for oxygen. In this study, the oxygen non-stoichiometry of perovskites LCCF was investigated by means of iodometric titration. LCCF was prepared using the liquid citrate method, and the phase structures were identified by X-ray diffraction. Fixed-bed experiments were performed to study the oxygen desorption performance of LCCF. The oxygen deficiency of LCCF increased with increasing Ca molar content of A site, but the value of δ of LCCF with increasing Fe molar content in B site is nearly constant. Experimental observation demonstrated that the O 2 release amount of LCCF does not depend on oxygen non-stoichiometry δ generated from A-site doping. At the same time, doping Fe in B site has an obvious impact on the oxygen desorption amount.

Keywords: CO 2 capture; perovskites; oxygen non-stoichiometry; crystal structure; oxygen release (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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