SURFACTANT STABILIZED PALLADIUM COLLOIDS AS PRECURSORS FOR CIS-SELECTIVE ALKYNE-HYDROGENATION CATALYSTS

Authors
BONNEMANN H BRIJOUX W SIEPEN K HORMES J FRANKE R POLLMANN J ROTHE J
Citation
H. Bonnemann et al., SURFACTANT STABILIZED PALLADIUM COLLOIDS AS PRECURSORS FOR CIS-SELECTIVE ALKYNE-HYDROGENATION CATALYSTS, Applied organometallic chemistry, 11(10-11), 1997, pp. 783-796
Citations number
15
Categorie Soggetti
Chemistry Applied","Chemistry Inorganic & Nuclear
Journal title
Applied organometallic chemistry → ACNP
ISSN journal
02682605
Volume
11
Issue
10-11
Year of publication
1997
Pages
783 - 796
Database
ISI
SICI code
0268-2605(1997)11:10-11<783:SSPCAP>2.0.ZU;2-O
Abstract
The performance of heterogeneous catalysts based on surfactant-stabili zed 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 protect ive shell as well as by the support and various promoters. The zwitter ionic surfactant sulfobetaine-12 (N,N-dimethyl-dodecylammoniopropanesu lfonate) appears to be best suited as a protective shell for highly se lective palladium-colloid catalysts under the surfactants tested. The preferred support is CaCO3: the Pd(SB12) colloids supported on CaCO3 s how the highest selectivities and activities of all tested catalysts. The best selectivity (98.1%) towards the desired cis-3-hexen-1-ol (lea f alcohol) is obtained with a lead-promoted palladium colloid supporte d on CaCO3, This catalyst is slightly (0.5%) better in selectivity and twice as active as a conventional Lindlar catalyst. (C) 1997 John Wil ey & Sons, Ltd.