Fig. 3 Nonenzymatic reactions in the presence of as-prepared FeS (blue) and the FeS electrochemically reduced at −0.7 V (versus SHE) for 7 days (FeS_PERM)

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Fig. 3 Nonenzymatic reactions in the presence of as-prepared FeS (blue) and the FeS electrochemically reduced at −0.7 V (versus SHE) for 7 days (FeS_PERM) (red). Nonenzymatic reactions in the presence of as-prepared FeS (blue) and the FeS electrochemically reduced at −0.7 V (versus SHE) for 7 days (FeS_PERM) (red). The yields were calculated relative to the initial amounts of starting materials of respective reactions. A full dataset for the identified and quantified products are presented in fig. S9 and tabulated in table S1 together with the results under the following conditions: with H2 gas, with FeCl2, with pure Fe0, and without reductant. The right diagram shows the reactions examined in the present study (a to g) and those demonstrated previously by simulating hydrothermal vent environments on the early Earth [CO2 → CO in (6) and CO → C2 and C3 compounds in (7, 9)]. Norio Kitadai et al. Sci Adv 2019;5:eaav7848 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).