Abstract
Free formic acid was produced in hydrogenation of carbon dioxide dissolved in aqueous sodium formate solutions under H2 and CO2 pressure with the water-soluble rhodium–phosphine complex, [RhCl(mtppms)3] (mtppms = monosulfonated triphenylphosphine) as catalyst. Concentration of sodium formate, total gas pressure and the pressure ratio of H2 to CO2 were the most important factors for production of HCOOH. Up to 0.13 M concentration of HCOOH was achieved, while there was negligible formic acid production in the absence of sodium formate.
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