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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

PARDEY, A.J. et al. HOMOGENEOUS CATALYSIS OF THE WATER GAS SHIFT REACTION: IR, 1H- AND 13C-NMR IN SITU STUDIES ON CATALYTIC IRIDIUM SYSTEMS. J. Chil. Chem. Soc. [online]. 2003, vol.48, n.2, pp.19-21. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072003000200003.

Reported here are the in situ FT-IR and 13C-NMR spectroscopic studies of the complex cis-[Ir(CO)2(py)2](PF6 ) (py = pyridine) dissolved in 80% aqueous pyridine used as a precursor in the homogeneous catalysis of the water gas shift reaction (WGSR, CO + H2O Æ CO2 + H2). These spectroscopy studies reveal the presence of aminocarbonyliridium complexes with linear and bridging carbonyls groups as reaction intermediates. The WGSR catalysis by Ir4(CO)12 complex dissolved in 80% of aqueous 4-picoline or pyridine under 1.9 atm of CO at 100 C and the FT-IR and 1H-NMR in situ studies of the pyridine promoted disproportionation of Ir4(CO)12, are also described

Keywords : Pyridine; WGSR; iridium catalyst.

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