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

Chemical looping processes based on multiple-step reduction and oxidation of metal oxides hold great promise for a variety of energy applications, such as CO 2 capture and conversion, gas separation, energy storage, and redox catalytic processes. Copper-based mixed oxides are one of the most promisi...

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Bibliographic Details
Published in:	Nature communications Vol. 13; no. 1; pp. 5109 - 14
Main Authors:	High, Michael, Patzschke, Clemens F., Zheng, Liya, Zeng, Dewang, Gavalda-Diaz, Oriol, Ding, Nan, Chien, Ka Ho Horace, Zhang, Zili, Wilson, George E., Berenov, Andrey V., Skinner, Stephen J., Sedransk Campbell, Kyra L., Xiao, Rui, Fennell, Paul S., Song, Qilei
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 30-08-2022 Nature Publishing Group Nature Portfolio
Subjects:	147/137 639/166/898 639/301/299/1013 639/4077/4057 639/925/357/354 Air separation Aluminates Aluminum Carbon dioxide Carbon sequestration Catalytic converters Copper Copper converters Energy storage Engineering Fluidized bed combustion Gas separation High temperature Humanities and Social Sciences Hydroxides Magnesium Materials selection Metal oxides Metals Mixed oxides multidisciplinary Nanoparticles Oxidation Oxides Oxygen Precursors Purification Redox properties Redox reactions Reduction (metal working) Science Science (multidisciplinary) Separation Sorbents Storage capacity
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Summary:	Chemical looping processes based on multiple-step reduction and oxidation of metal oxides hold great promise for a variety of energy applications, such as CO 2 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 O 2 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. Thermochemical redox reactions of metal oxides are promising for CO 2 capture, gas purification, air separation, and energy storage. Here, the authors report mixed metal oxides derived from layered double hydroxides precursors, and demonstrate their reversible and stable thermochemical oxygen storage.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2041-1723 2041-1723
DOI:	10.1038/s41467-022-32593-6