Precursor engineering of hydrotalcite-derived redox sorbents for reversible and stable thermochemical oxygen storage

Michael High, Clemens F. Patzschke, Liya Zheng, Dewang Zeng, Oriol Gavalda-Diaz, Nan Ding, Ka Ho Horace Chien, Zili Zhang, George E. Wilson, Andrey V. Berenov, Stephen J. Skinner, Kyra L. Sedransk Campbell, Rui Xiao (), Paul S. Fennell () and Qilei Song ()
Additional contact information
Michael High: Imperial College London
Clemens F. Patzschke: Imperial College London
Liya Zheng: Imperial College London
Dewang Zeng: Imperial College London
Oriol Gavalda-Diaz: Imperial College London
Nan Ding: Imperial College London
Ka Ho Horace Chien: Imperial College London
Zili Zhang: Imperial College London
George E. Wilson: Imperial College London
Andrey V. Berenov: Imperial College London
Stephen J. Skinner: Imperial College London
Kyra L. Sedransk Campbell: The University of Sheffield, Western Bank
Rui Xiao: Southeast University
Paul S. Fennell: Imperial College London
Qilei Song: Imperial College London

Nature Communications, 2022, vol. 13, issue 1, 1-14

Abstract: Abstract Chemical looping processes based on multiple-step reduction and oxidation of metal oxides hold great promise for a variety of energy applications, such as CO2 capture and conversion, gas separation, energy storage, and redox catalytic processes. Copper-based mixed oxides are one of the most promising candidate materials with a high oxygen storage capacity. However, the structural deterioration and sintering at high temperatures is one key scientific challenge. Herein, we report a precursor engineering approach to prepare durable copper-based redox sorbents for use in thermochemical looping processes for combustion and gas purification. Calcination of the CuMgAl hydrotalcite precursors formed mixed metal oxides consisting of CuO nanoparticles dispersed in the Mg-Al oxide support which inhibited the formation of copper aluminates during redox cycling. The copper-based redox sorbents demonstrated enhanced reaction rates, stable O2 storage capacity over 500 redox cycles at 900 °C, and efficient gas purification over a broad temperature range. We expect that our materials design strategy has broad implications on synthesis and engineering of mixed metal oxides for a range of thermochemical processes and redox catalytic applications.

Date: 2022
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DOI: 10.1038/s41467-022-32593-6

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