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The CO hydrogenation over Rh_4(CO)_(12)SiO_2 catalyst promoted with man-ganese and lithium was reported.As compared with conventional RhCI_3/SiO_2 catalyst,silica-supported rhodium carbonyl cluster catalysts have higher reactive activities.Manganese increases CO conversion by more than one order of magnitude and lithiumlowers CO hydrogenation activity,whereas Rh_4(CO)_(12)-MnCl_2-LiCI/SiO_2 catalyst giveshigher CO conversion and selectivity to C_2-oxygenate.XPS and IR spectra show thatmanganese stabilizes Rh(Ⅰ)ions and facilitated CO molecule activation via its syner-gism with rhodium enhancing CO conversion obviously.ESR results preliminarily revealthe interaction of rhodium with manganese.The mechanism of CO hydrogenation is dis-cussed primarily.
The CO hydrogenation over Rh_4 (CO) _ (12) SiO_2 catalyst promoted with man-ganese and lithium was reported. As compared with conventional RhCl_3 / SiO_2 catalyst, silica-supported rhodium carbonyl cluster catalysts have higher reactive activities. more than one order of magnitude and lithium lowers CO hydrogenation activity, while Rh_4 (CO) _ (12) -MnCl_2-LiCl / SiO_2 catalyst gives shigher CO conversion and selectivity to C_2 -oxyate.XPS and IR spectra show thatngnganese stabilizes Rh (Ⅰ) ions and facilitated CO molecule activation via its syner-gism with rhodium enhancing CO conversion obviously. ESR results preliminarily reveal the interaction of rhodium with manganese. the mechanism of CO hydrogenation is dis-cussed primarily.