An alumina phase induced composite transition shuttle to stabilize carbon capture cycles

Xingyue Ma, Shuxuan Luo, Yunhui Hua, Seshadri Seetharaman, Xiaobo Zhu, Jingwei Hou (), Lei Zhang, Wanlin Wang () and Yongqi Sun ()
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Xingyue Ma: Central South University
Shuxuan Luo: Central South University
Yunhui Hua: Nanyang Technological University
Seshadri Seetharaman: Royal Institute of Technology
Xiaobo Zhu: Changsha University of Science and Technology
Jingwei Hou: The University of Queensland
Lei Zhang: Central South University
Wanlin Wang: Central South University
Yongqi Sun: Central South University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Limiting global warming to 1.5-2 °C requires a 50-90% reduction in CO2 emissions in 2050, depending on different scenarios, and carbon capture, utilization, and storage is a promising technology that can help reach this objective. Calcium oxide (CaO) carbon capture is an appealing choice because of its affordability, large potential capacity, and ability to withstand the high temperatures of flue gases. However, the structural instability and capacity fading challenge its large-scale industrial applications. Here, we design a reversible reaction shuttle in CaO-based sorbents to improve the structure stability by changing the initial alumina phases. Diverse alumina phases (x-Al2O3) are first synthesized and utilized as the aluminum source for creating CaO@x-Al2O3 composites. As expected, the CaO@δ-Al2O3 composite demonstrates a carbon capture capacity of 0.43 g-CO2/g-sorbent after 50 cycles, with an impressive capacity retention of 82.7%. Combined characterizations and calculations reveal that this stability improvement is attributed to a transition shuttle between Ca3Al2O6 and Ca5Al6O14, which can effectively restrain the complete decompositions of those structure-stabilized intermediate phases. An economic assessment further identifies the significance of heat transfer efficiency improvement upon cycles, and control of capital/operation cost, energy price and carbon tax for a future cost-effective commercialization of current strategy.

Date: 2024
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DOI: 10.1038/s41467-024-52016-y

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