Resumen de Homogeneous catalysis of the water gas shift reaction: Ir, ¹h- and 13c-nmr in situ studies on catalytic iridium systems
A. J. Pardey, M.A. Moreno, M. C. Ortega, B. Mendez, A. B. Rivas, S. A Moya, D. Villagra, M. Lutz
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
