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Abstract

The present disclosure provides a carbon dioxide capture method for coupled staged electrolysis/pyrolysis hydrogen production. The method includes: capturing CO₂ in a target component by using an alkaline solution and obtaining a carbonate solution; enabling the carbonate solution to be subjected to mild electrolysis, obtaining a hydroxide and H₂ at a cathode, obtaining bicarbonate and a mixed gas of O₂/CO₂ mixed gas at an anode, and absorbing the CO₂ from the mixed gas through a small absorption tower to obtain pure oxygen; recycling the hydroxide to serve as a capture agent; and pyrolyzing the bicarbonate to obtain pure CO₂. According to the method for cyclically absorbing/releasing the CO₂ by using the alkaline solution, a technology for capturing CO₂ within a wide concentration range may be provided.

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First Claim