Hydrogenation of cyclopentadiene in binary mixtures with unsaturated hydrocarbons over palladium and platinum blacks

Summary

• 1. A study was made of the selectivity of the hydrogenation of cyclopentadiene into cyclopentene in binary mixtures with unsaturated hydrocarbons in presence of palladium and platinum blacks.

• 2. It was found that, like Raney nickel. palladium black brings about selective hydrogenation of cyclopentadiene in its binary mixture with cyclohexene, but nonselective hydrogenation in mixtures with styrene. Palladium black differs from Raney nickel in that it does not bring about selective hydrogenation of cyclopentadiene in its mixtures with diphenylacetylene. In presence of platinum black, cyclopentadiene is not hydrogenated selectively in binary mixtures with cyclopentene and 1-octene.