title: The fine structure of Pearlman's catalyst.
abstract: Pearlman's catalyst, nominally Pd(OH)2/C, is widely used as for hydrogenation reactions and C-C coupling reactions. Contrary to the accepted view, we show that Pearlman's catalyst as prepared and after drying consists of carbon supported (mostly) nano-particulate hydrous palladium oxide capped with a monolayer of hydroxyls hydrogen-bonded to a few layers of water: a core-shell structure of C/PdO/OH/H2O. The conventional formulation Pd(OH)2/C from the macroscopic point of view is ruled-out by the different spectral signatures of surface hydroxyls and stoichiometric hydroxides. We also show that a minor fraction of the palladium is present as a reduced species.
authors.affiliation: AQura GmbH, D-63457 Hanau/Wolfgang, Germany. peter.albers@aqura.de.
authors.forename: Peter W
authors.initials: PW
authors.lastname: Albers
authors.forename: Konrad
authors.initials: K
authors.lastname: Möbus
authors.forename: Stefan D
authors.initials: SD
authors.lastname: Wieland
authors.forename: Stewart F
authors.initials: SF
authors.lastname: Parker