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Abstract
Support and promoter effects on molybdenum-containing Rh/SiO 2 and Rh/ZrO 2 catalysts, derived from the carbonyl precursors Rh 4(CO) 12 and Mo(CO) 6, have been studied in carbon monoxide hydrogenation at 1.1 MPa. Mo increases the total activity of the catalysts. ZrO 2 favours the formation of oxygenates, particularly ethanol. In situ FT-IR spectroscopic experiments, temperature-programmed reaction of adsorbed CO, H 2 and CO chemisorption, CO disproportionation as well as ethylene hydroformylation have been used to characterize the catalysts. Whereas the activity-promoting effect of Mo has been found to be due to the specific promotion of CO dissociation by Mo, the effect of ZrO 2 on the selectivity can be related to an increased CO insertion ability on zirconia-supported catalysts owing to the presence of activated surface carbonyl complexes, such as [Display omitted] under reaction conditions.
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