Self-assembled Fe-CaO bifunctional materials with nickel foam template for CO2 capture and in-situ conversion

The capture and catalytic performance in integrated CO 2 and utilization (ICCU) potentially contributes to reduce CO 2 emissions with low cost and high efficiency. Breaking through the limitations of conventional dual-functional materials (DFMs). Herein, Fe-CaO/NF self-assembled with nickel foam (NF) as template is designed and prepared via hydrothermal method. CaO is anchored on the Ni-foam skeleton, and Fe-Ni bimetallic sites within the CaO matrix establishes dual-active centers synergizing CO 2 chemisorption and activation. The stability and activity stability of CO 2 capture and in-situ conversion were improved, CO 2 capture capacity is 12.8 mmol/g, CO yield is 9.33 mmol/g, ∼80 % CO 2 conversion is achieved, and 100 % CO selectivity is obtained. It shows good cycle stability and high activity in 12 cycles. The synergistic effect of Fe and Ni on CO 2 adsorption and conversion was confirm by DRIFTS. The interaction between CaO and Fe is weakened by Ni, while the interaction with Fe promotes the conversion of CO 2 . In comparison, the stability and activity of the without O 2 -containing cycle are higher than those of the O 2 -containing. O 2 has a negative effect, leading to competitive adsorption between CO 2 and H 2 O in the CO 2 capture process. The H 2 O molecular layer is formed on the surface of the rod-like structure, and the reduction of the active phase is interference, resulting the regeneration of CaO was decline.