Carbon nanofiber supported palladium catalyst for liquid-phase reactions. An active and selective catalyst for hydrogenation of CC bonds(C. Pham-Huu, N. Keller, L. J. Charbonniere, R. Ziessel, M. J. Ledoux; Chem. Commun. 2000, 19 (1871 - 1872))
DOI:10.1039/b005306f
Carbon nanofibers with a mean diameter of about 50 nm were successfully used as support for a palladium catalyst in the liquid phase selective hydrogenation of the C=C bond in an alpha,beta-unsaturated molecule: a less critical problem of mass-transfer limitation led to the obtention of a highly active and chemo-selective catalyst compared to a commercial high surface area activated charcoal supported palladium catalyst.
Since their discovery at the beginning of the last decade, 1 carbon nanotubes and nanofibers seemed to be promising candidates for use as catalyst supports for heterogeneous catalytic reactions. Such materials were expected to be efficient in liquid phase media due to their high external surfaces which can allow a significant decrease in critical mass transfer limitations, also leading to an increase in the rate and the selectivity of the reactions.
The aim of the present communication is to report the preparation of a highly dispersed palladium catalyst supported on carbon nanofibers, which is active and chemo-selective in the liquid phase hydrogenation of the CC bond of cinnamaldehyde, at atmospheric pressure. The reaction rate and the product distribution are compared with those obtained on a commercially available activated charcoal supported palladium catalyst under the same reaction conditions.
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Again, nanofiber-supported palladium isn't very available; but they selectively hydrogenate the double bond in cinnamaldehyde with it, for example...
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