Effect of A/B-site substitution on oxygen production performance of strontium cobalt based perovskites for CO2 capture application

Research output: Contribution to journalArticle

Abstract

Oxy-fuel combustion is one of the proposed technologies which have the potential to achieve zero CO2 emission. Strontium cobalt based perovskite oxygen carriers are promising materials for air separation with a high selectively for oxygen. And these perovskites can produce an oxygen enriched carbon dioxide stream for an oxy-fuel combustion process. The relatively low oxygen production yield may be a drawback of this type of material for this technology. This paper presents an effective approach by A/B-site substitution to improve the oxygen production performance of the perovskites. In this study, a series of different A/B-site substituted SrCo0.8Fe0.2O3-delta were prepared by an EDTA-citrate sol-gel combustion synthesis method. Fixed-bed experiments and TGA measurements were performed to study the effects of A/B-site substitution on cyclic oxygen adsorption/desorption performance of the synthesized samples. The experimental results indicate that the oxygen desorption amounts of different A-site substituted perovskites decrease in the order of BaCo0.8Fe0.2O3-delta > Ba0.5Sr0.5Co0.8Fe0.2O3-delta > SrCo0.8Fe0.2O3-delta > Sr0.5Ca0.5Co0.8Fe0.2O3-delta > MgCo0.8Fe0.2O3-delta. Moreover, B-site substitution by different transition metal ions can significantly modify oxygen adsorption capacity and oxygen desorption performance of SrCo0.8Fe0.2O3-delta. Furthermore, oxygen desorption performance can be improved when Fe ions of the perovskite SrCo0.8Fe0.2O3-delta are substituted by Zr, Cr, Zn, and Ni ions.

Details

Authors
  • Qiuwan Shen
  • Ying Zheng
  • Cong Luo
  • Ning Ding
  • Chu-Guang Zheng
  • Marcus Thern
Organisations
External organisations
  • Huazhong University of Science and Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering
  • Chemical Process Engineering
Original languageEnglish
Pages (from-to)39785-39790
JournalRSC Advances
Volume5
Issue number50
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes