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Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation

1
Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
2
Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia
3
School of Chemistry, Monash University, Clayton, VIC 3800, Australia
4
Centre for Clean Environment and Energy, School of Environment and Science, Griffith University, Gold Coast Campus, QLD 4222, Australia
*
Authors to whom correspondence should be addressed.
Received: 22 March 2019 / Revised: 20 April 2019 / Accepted: 22 April 2019 / Published: 1 May 2019
(This article belongs to the Special Issue Advanced Coal, Biomass and Waste Conversion Technologies)
PDF [871 KB, uploaded 1 May 2019]
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Abstract

Formic 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.
Keywords: hydrogen production; formic acid dehydrogenation; enzymatic carbon capture; electrochemistry hydrogen production; formic acid dehydrogenation; enzymatic carbon capture; electrochemistry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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.

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