| Popis: |
Transition metal complexes of Mn, Rh, and Ru have been found to catalyze the homologation of methanol in methanol-amine solutions at syn-gas pressure near 300 atm and temperatures near 200°C. These catalysts are believed to operate by mechanisms similar to that proposed for Fe(CO)5, and likewise produce CO2 as the oxygenated by-product and do not homologate the ethanol product. The use of two metal complexes together as catalysts has also been examined. In a mixed Fe(CO)s-Mn2(CO)10 catalyst solution, methanol is converted at a rate of 14% h−1 at 200°C. Ethanol accounts for 72% of the product, the balance being methane. Additives such as phosphines and methyl iodide are found to affect the rate and the selectivity of these systems. |
