Homogeneous hydrogenation of carbon dioxide and bicarbonate in aqueous solution catalyzed by water-soluble ruthenium(II) phosphine complexes

J. ános Elek, Levente Nádasdi, Gábor Papp, Gábor Laurenczy, Ferenc Joó

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

The water-soluble Ru(II)-phosphine complex, [{RuCl2(mTPPMS) 2}2] was found a suitable catalyst for the hydrogenation of NaHCO3 to NaHCO2 in aqueous solution under mild conditions with catalyst turnover frequencies (TOFs) in the range of 35-50h -1 at 50°C and 10bar total pressure. The suggested reaction mechanism involves the formation of Ru(II)-hydrides of the general formula [RuHX(mTPPMS)4] where X=H-, HCO3- or HCO2-. At 80°C and 95bar total pressure, the reduction of NaHCO3 proceeded with high reaction rate (9600h -1) hitherto unobserved in purely aqueous solutions. The reactions do not require the presence of organic amine additives, however, the addition of quinoline increased the rate considerably. Aqueous suspensions of calcium carbonate could also be hydrogenated with CO2/H2 gas mixtures.

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalApplied Catalysis A: General
Volume255
Issue number1
DOIs
Publication statusPublished - Nov 28 2003

Keywords

  • Carbon dioxide
  • Hydrogenation
  • Phosphine complexes
  • Ruthenium
  • Water-soluble

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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