STUDY OF RHCO BIMETALLIC CATALYSTS .3. SU RFACE CARBONYL HYDRIDE AND THEIR BEHAVIOR ON RH+CO AL2O3/

CO hydrogenation of Rh + Co/Al2O3 has been studied by using a flow mic ro-reactor. CO hydrogenation took place over 220 degrees C and reactio n activity increased with the reaction temperature and H-2/CO ratio. C oadsorption of CO and H-2 as well as dynamic behavior of coadsorbed CO and H-2 have been investigated by TP-IR dynamic method. The results i ndicate that in coadsorption of CO and H-2 at 20 degrees C, gem-dicarb onyl CO and linear CO transformed partly into the corresponding carbon yl hydride. With increasing the temperature, the residual gem-dicarbon yl CO and linear CO transformed also into the corresponding carbonyl-h ydride, while the carbonyl hydrides transformed into the multi-hydroge n carbonyl hydrides. Before arriving at the reaction temperature, ther e are only the carbonyl hydrides and the multi-hydrogen carbonyl hydri de which led to the formation of CH4 at the reaction temperature on th e surface of Rh + Co/Al2O3. To relate these results with the results o btained in CO hydrogenation and in CO disproportionation. We believe t hat in CO hydrogenation reaction, the scission of C-O bond is via the carbonyl hydride-multihydrogen carbonyl hydride.