Carbon dioxide decomposition through gas exchange in barium calcium iron niobates

Harriet Kildahl; Zhongbo Li; Hui Cao; Peter Slater; Yulong Ding

doi:10.1016/j.cattod.2020.05.024

Carbon dioxide decomposition through gas exchange in barium calcium iron niobates

Harriet Kildahl, Zhongbo Li, Hui Cao, Peter Slater, Yulong Ding

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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, Ba₂Ca_0.66Nb_0.34FeO_6-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
Journal	Catalysis Today
Early online date	11 May 2020
DOIs	https://doi.org/10.1016/j.cattod.2020.05.024
Publication status	E-pub ahead of print - 11 May 2020

Keywords

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

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https://www.sciencedirect.com/science/article/pii/S0920586120303035Licence: None: All rights reserved

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title = "Carbon dioxide decomposition through gas exchange in barium calcium iron niobates",

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.",

keywords = "Barium calcium iron niobates, CO2 reduction, Carbon dioxide conversion, Chemical looping, Perovskite",

author = "Harriet Kildahl and Zhongbo Li and Hui Cao and Peter Slater and Yulong Ding",

year = "2020",

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doi = "10.1016/j.cattod.2020.05.024",

language = "English",

journal = "Catalysis Today",

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T1 - Carbon dioxide decomposition through gas exchange in barium calcium iron niobates

AU - Kildahl, Harriet

AU - Li, Zhongbo

AU - Cao, Hui

AU - Slater, Peter

AU - Ding, Yulong

PY - 2020/5/11

Y1 - 2020/5/11

N2 - 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.

AB - 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.

KW - Barium calcium iron niobates

KW - CO2 reduction

KW - Carbon dioxide conversion

KW - Chemical looping

KW - Perovskite

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DO - 10.1016/j.cattod.2020.05.024

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SN - 0920-5861

JO - Catalysis Today

JF - Catalysis Today

ER -

Carbon dioxide decomposition through gas exchange in barium calcium iron niobates

Abstract

Keywords

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