Carbon dioxide decomposition through gas exchange in barium calcium iron niobates

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

Abstract

A number of metal oxides and perovskites are capable of being reduced at high temperatures and then re-oxidised in the presence of CO2 or H2O to form CO or H2. Barium calcium iron niobates have been found to be redox-active in this way. The redox activity of these perovskites was explored, and the chemical and physical stability was investigated using EDX and SEM imaging, respectively. The most promising, Ba2Ca0.66Nb0.34FeO6-δ (BCNF1), showed mass changes of 0.45 % after five cycles of reduction with N2 and re-oxidation with 10 % CO2. BCNF1 is chemically stable as it shows no changes in XRD and shows no evidence of sintering, although cracking of the pellets was observed after re-oxidation. The low enthalpy of re-oxidation of BCNF1 coupled with the high and sustained mass change makes this perovskite suitable for chemical looping use for energy storage and conversion systems.

Details

Original languageEnglish
JournalCatalysis Today
Early online date11 May 2020
Publication statusE-pub ahead of print - 11 May 2020

Keywords

  • Carbon dioxide conversion, Perovskite, CO2 reduction, Chemical looping, Barium calcium iron niobates