title: Characterisation of the surface of freshly prepared precious metal catalysts.
abstract: A combination of electron microscopy, X-ray and neutron spectroscopies and computational methods has provided new insights into the species present on the surface of freshly prepared precious metal catalysts. The results show that in all cases, at least half of the surface is metallic or nearly so, with the remainder covered by oxygen, largely as hydroxide. Water is also present and is strongly held; weeks of pumping under high vacuum is insufficient to remove it. The hydroxyls are reactive as shown by their reaction with or displacement by CO and can be removed by hydrogenation. This clearly has implications for how precious metal catalysts are activated after preparation.
authors.affiliation: ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK. stewart.parker@stfc.ac.uk.
authors.forename: Stewart F
authors.initials: SF
authors.lastname: Parker
authors.forename: Devashibhai
authors.initials: D
authors.lastname: Adroja
authors.forename: Mónica
authors.initials: M
authors.lastname: Jiménez-Ruiz
authors.forename: Markus
authors.initials: M
authors.lastname: Tischer
authors.forename: Konrad
authors.initials: K
authors.lastname: Möbus
authors.forename: Stefan D
authors.initials: SD
authors.lastname: Wieland
authors.forename: Peter
authors.initials: P
authors.lastname: Albers