Effect of Alkali Metal Cations on Dehydrogenative Coupling of Formate Anions to Oxalate

Atsushi Tahara ^1* Aksa Mori ² Jun-Ichiro Hayashi ² Shinji Kudo ²

• ¹ Tohoku University, Sendai, Japan
• ² Kyushu University, Fukuoka, Fukuoka, Japan

With the growing global concern over CO₂ emissions, reducing CO₂ output has become an urgent requirement. Ironmaking is among the highest CO₂-emitting industries, primarily due to the use of coke as a reductant and the use of a heat source at around 2,000 °C. To address this issue, various alternative reductants, including CO, H₂, and lignite, have been explored. Building on these efforts, we recently reported a novel ironmaking system utilizing oxalic acid (HOOC-COOH) as the reductant. Formate salts, hydrogenated forms of CO₂, are promising precursors for oxalate salts; however, their behavior during dimerization remains poorly understood. Herein, we investigate the influence of group 1 and 2 metal cations on the base-promoted dehydrogenative coupling of formate to form oxalate. Treatment of sodium formate with various bases (group 1 and 2 metal carbonates or hydroxides) revealed that group 1 metal hydroxides are more effective than metal carbonates for oxalate formation, with cesium hydroxide (CsOH) exhibiting high reactivity. Density functional theory (DFT) calculations suggest that this kinetic advantage arises not only from increased basicity but also from intermediate destabilization in the Na/Cs mixed cation system. Additionally, both experimental and theoretical investigations reveal that oxalate yield is influenced by the thermodynamic stability of intermediates and products (oxalate salts), highlighting the crucial role of cations in the reaction.