Abstract
The rhodium supported on active carbon has been found to be active for pentan-3-one formation from C 2H 4, CO, and H 2, as well as propionaldehyde formation. Among three Rh/active carbon catalysts prepared from different kinds of rhodium compounds (RhCl 3, Rh(NO 3) 3, and Rh(CH 3COO) 3), one prepared from RhCl 3 showed the highest activity for pentan-3-one formation. Comparing pentan-3-one formation with propionaldehyde formation, the effects of the following factors on the catalytic activity were observed to be different in both reactions; (i) effects of reaction temperature, (ii) effects on H 2 pretreatment of catalysts, and (iii) effects of partial pressure of CO. On pentan-3-one formation, 13C 2H 5CO 13C 2H 5 and C 2H 5 13COC 2H 5 were found to be the predominant products in the reaction of propionaldehyde- 13C 2H 4-CO-H 2 and of propionaldehyde-C 2H 4- 13CO-H 2, respectively. These results indicate that the route for pentan-3-one formation is the reaction among two molecules of C 2H 4 and each one molecule of CO and H 2, and not the reaction between C 2H 4 and propionaldehyde.
Published Version
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