Reversible hydrogenation of carbon dioxide to formic acid using a Mn-pincer complex in the presence of lysine

Duo Wei, Rui Sang, Peter Sponholz (), Henrik Junge () and Matthias Beller ()
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Duo Wei: Leibniz-Institut für Katalyse e.V.
Rui Sang: Leibniz-Institut für Katalyse e.V.
Peter Sponholz: APEX Energy Teterow GmbH
Henrik Junge: Leibniz-Institut für Katalyse e.V.
Matthias Beller: Leibniz-Institut für Katalyse e.V.

Nature Energy, 2022, vol. 7, issue 5, 438-447

Abstract: Abstract Efficient hydrogen storage and release are essential for effective use of hydrogen as an energy carrier. In principle, formic acid could be used as a convenient hydrogen storage medium via reversible CO2 hydrogenation. However, noble metal-based catalysts are currently needed to facilitate the (de)hydrogenation, and the CO2 produced during hydrogen release is generally released, resulting in undesirable emissions. Here we report an α-amino acid-promoted system for reversible CO2 hydrogenation to formic acid using a Mn-pincer complex as a homogeneous catalyst. We observe good stability and reusability of the catalyst and lysine as the amino acid at high productivities (CO2 hydrogenation: total turnover number of 2,000,000; formic acid dehydrogenation: total turnover number of 600,000). Employing potassium lysinate, we achieve >80% H2 evolution efficiency and >99.9% CO2 retention in ten charge–discharge cycles, avoiding CO2 re-loading steps between each cycle. This process was scaled up by a factor of 18 without obvious drop of the productivity.

Date: 2022
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DOI: 10.1038/s41560-022-01019-4

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