| Summary: | A Zr-doped CaO sorbent for high-temperature CO<sub>2</sub> capture was fabricated using electrospinning. The nanofiber sorbent with an average filament diameter of about 160 nm is characterized by an initial CO<sub>2</sub> uptake capacity of 12.1 mmol/g, a specific surface area of 79 m<sup>2</sup>/g, an indentation Young’s modulus of 520 MPa, and a hardness of 1.6 MPa. After 50 carbonation/decarbonation cycles, the sorbent has a decent CO<sub>2</sub> uptake capacity of 9.7 mmol/g due to the uniform distribution of CaZrO<sub>3</sub> in the CaO nanofibers to prevent CaO grain growth caused by CaCO<sub>3</sub> sintering. It is revealed that the sorbent CO<sub>2</sub> uptake capacity decreases both with an increase in the decarbonation temperature and with an increase in the CO<sub>2</sub> concentration in the gas flow upon carbonation, where the sorbent CO<sub>2</sub> uptake capacity is more sensitive to the decarbonation temperature than to the CO<sub>2</sub> concentration in the gaseous stream during carbonation. It is assumed that the electrospun regenerable Zr-doped CaO sorbent is effective for removing CO<sub>2</sub> from flue gases.
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