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.
Original language | English |
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Pages (from-to) | 211-219 |
Number of pages | 9 |
Journal | Catalysis Today |
Volume | 364 |
Early online date | 11 May 2020 |
DOIs | |
Publication status | Published - 15 Mar 2021 |
Externally published | Yes |
Event | 14th International Conference on Catalysis in Membrane Reactors - Eindhoven, Netherlands Duration: 8 Jul 2019 → 11 Jul 2019 Conference number: 14 https://www.aanmelder.nl/99737 |