Iron sulfide-catalyzed gaseous CO2 reduction and prebiotic carbon fixation in terrestrial hot springs

Jingbo Nan, Shunqin Luo (), Quoc Phuong Tran, Albert C. Fahrenbach, Wen-Ning Lu, Yingjie Hu, Zongjun Yin, Jinhua Ye () and Martin J. Kranendonk
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Jingbo Nan: Chinese Academy of Sciences
Shunqin Luo: National Institute for Materials Science (NIMS)
Quoc Phuong Tran: University of New South Wales
Albert C. Fahrenbach: University of New South Wales
Wen-Ning Lu: National Institute for Materials Science (NIMS)
Yingjie Hu: Nanjing Xiaozhuang University
Zongjun Yin: Chinese Academy of Sciences
Jinhua Ye: National Institute for Materials Science (NIMS)
Martin J. Kranendonk: University of New South Wales

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Understanding abiotic carbon fixation provides insights into early Earth’s carbon cycles and life’s emergence in terrestrial hot springs, where iron sulfide (FeS), similar to cofactors in metabolic enzymes, may catalyze prebiotic synthesis. However, the role of FeS-mediated carbon fixation in such conditions remains underexplored. Here, we investigate the catalytic behaviors of FeS (pure and doped with Ti, Ni, Mn, and Co), which are capable of H2-driven CO2 reduction to methanol under simulated hot spring vapor-zone conditions, using an anaerobic flow chamber connected to a gas chromatograph. Specifically, Mn-doped FeS increases methanol production five-fold at 120 °C, with UV−visible light (300–720 nm) and UV-enhanced light (200–600 nm) further increasing this activity. Operando and theoretical investigations indicate the mechanism involves a reverse water-gas shift with CO as an intermediate. These findings highlight the potential of FeS-catalyzed carbon fixation in early Earth’s terrestrial hot springs, effective with or without UV light.

Date: 2024
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DOI: 10.1038/s41467-024-54062-y

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