Abstract
The performance of heterogeneous catalysts based on surfactant-stabilized palladium colloids is compared with conventional Pd/C and Lindlar catalysts in the partial hydrogenation of 3-hexyn-1-ol under optimized reaction conditions. The selectivity can be influenced by the protective shell as well as by the support and various promoters. The zwitterionic surfactant sulfobetaine-12 (N,N-dimethyldodecylammoniopropanesulfonate) appears to be best suited as a protective shell for highly selective palladium-colloid catalysts under the surfactants tested. The preferred support is CaCO3: the Pd(SB12) colloids supported on CaCO3 show the highest selectivities and activities of all tested catalysts. The best selectivity (98.1%) towards the desired cis-3-hexen-1-ol (leaf alcohol) is obtained with a lead-promoted palladium colloid supported on CaCO3. This catalyst is slightly (0.5%) better in selectivity and twice as active as a conventional Lindlar catalyst. © 1997 John Wiley & Sons, Ltd.
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