A significant promoting effect of iridium was observed on vapor phase hydroformylation of ethene over Co/Si02 catalyst. The performance of catalyst depends on the precursors of cobalt and iridium. More than 70% of the selectivity of oxygenates was achieved on Co(A)-Ir(C0)/SiO2 derived from Co(OCOCH3)2⋅4H2O, and Ir4(CO)12 under the condition s of 4.1 MPa of a gas mixture of Ar/C2H4fCO/H2=10/30/54/6 at 423 K. Hydroformylation is considered to proceed on a highly dispersed cobalt metal. Iridium promoted the reduction of Co" on Co/SiO2 to cobalt metal by a hydrogen spillover mechanism.
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