Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation
AbstractFormic acid (FA) is a promising reservoir for hydrogen storage and distribution. Its dehydrogenation releases CO2 as a by-product, which limits its practical application. A proof of concept for a bio-catalytic system that simultaneously combines the dehydrogenation of formic acid for H2, in-situ capture of CO2 and its re-hydrogenation to reform formic acid is demonstrated. Enzymatic reactions catalyzed by carbonic anhydrase (CA) and formate dehydrogenase (FDH) under ambient condition are applied for in-situ CO2 capture and re-hydrogenation, respectively, to develop a sustainable system. Continuous production of FA from stripped CO2 was achieved at a rate of 40% using FDH combined with sustainable co-factor regeneration achieved by electrochemistry. In this study, the complete cycle of FA dehydrogenation, CO2 capture, and re-hydrogenation of CO2 to FA has been demonstrated in a single system. The proposed bio-catalytic system has the potential to reduce emissions of CO2 during H2 production from FA by effectively using it to recycle FA for continuous energy supply.
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Zhao, Z.; Yu, P.; Shanbhag, B.K.; Holt, P.; Zhong, Y.L.; He, L. Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation. C 2019, 5, 22.
Zhao Z, Yu P, Shanbhag BK, Holt P, Zhong YL, He L. Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation. C. 2019; 5(2):22.Chicago/Turabian Style
Zhao, Zhengyang; Yu, Pei; Shanbhag, Bhuvana K.; Holt, Phillip; Zhong, Yu Lin; He, Lizhong. 2019. "Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation." C 5, no. 2: 22.
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