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Free formic acid by hydrogenation of carbon dioxide in sodium formate solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
51720 46851 2011 3 PDF Available
Title
Free formic acid by hydrogenation of carbon dioxide in sodium formate solutions
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.

Graphical abstractCatalytic hydrogenation of carbon dioxide to free formic acid (not to formate salts) was feasible in aqueous sodium formate solution as solvent, but was negligible in neat water.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Hydrogenation of CO2 was catalyzed by a water-soluble rhodium(I)-phosphine complex. ► Aqueous sodium formate solutions were used as solvent. ► Free HCOOH (rather than formate salts) was obtained up to 0.13 M concentration. ► There was negligible formation of HCOOH in the absence of HCOONa. ► High total gas pressure and high CO2 partial pressure promoted formation of HCOOH.

Keywords
Carbon dioxide; Hydrogenation; Formic acid; Rhodium; Experiment design
First Page Preview
Free formic acid by hydrogenation of carbon dioxide in sodium formate solutions
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 14, Issue 1, 25 October 2011, Pages 74–76
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis