# Radiolytic approach for efficient, selective and catalyst‐free CO$_2$ conversion at room temperature

* Corresponding author
3 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The present study proposes a new approach for direct CO$_2$ conversion using primary radicals from water irradiation. In order to ensure reduction of CO$_2$ into CO$_2^{-•}$ by all the hydrated electrons, we use formate ions to scavenge simultaneously the parent oxidizing radicals H$^•$ and OH$^•$ producing the same transient CO$_2^{-•}$ radicals. Conditions are optimized to obtain the highest conversion yield of CO$_2$. The goal is achieved under mild conditions of room temperature, neutral pH and 1 atm of CO$_2$ pressure. All the available radicals are exploited for selectively converting CO$_2$ into oxalate that is accompanied by H$_2$ evolution. The mechanism presented accounts for the results and also sheds light on the data in the literature. The radiolytic approach is a mild and scalable route of direct CO$_2$ capture at the source in industry and the products, oxalate salt and H$_2$, can be easily separated.
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-03287511
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Submitted on : Thursday, July 15, 2021 - 4:36:44 PM
Last modification on : Monday, September 20, 2021 - 7:53:28 AM
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### Citation

Changjiang Hu, Sarah Al Gharib, Yunlong Wang, Pingping Gan, Qiuhao Li, et al.. Radiolytic approach for efficient, selective and catalyst‐free CO$_2$ conversion at room temperature. ChemPhysChem, Wiley-VCH Verlag, In press, 22 (18), pp.1900-1906. ⟨10.1002/cphc.202100378⟩. ⟨cea-03287511⟩

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