title: In situ studies of NO reduction by H2over Pt using surface X-ray diffraction and transmission electron microscopy.
abstract: In situ surface X-ray diffraction and transmission electron microscopy at 1 bar show massive material transport of platinum during high-temperature NO reduction with H2. A Pt(110) single-crystal surface shows a wide variety of surface reconstructions and extensive faceting of the surface. Pt nanoparticles change their morphology depending on the gas composition: They are faceted in hydrogen-rich environments, but are more spherical in NO-rich environments, indicating the formation of vicinal surfaces. We conclude that high coverage of NO combined with sufficient mobility of platinum surface atoms is the driving force for the formation of steps on both flat surfaces and nanoparticles. Since the steps that are introduced provide strongly coordinating adsorption sites with potential catalytic benefits, this may be of direct practical relevance for the performance of catalytic nanoparticles under high-pressure conditions.
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
authors.forename: S B
authors.initials: SB
authors.lastname: Roobol
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands and European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France.
authors.forename: W G
authors.initials: WG
authors.lastname: Onderwaater
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
authors.forename: M A
authors.identifier: http://orcid.org/0000-0002-5136-2816
authors.initials: MA
authors.lastname: van Spronsen
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France.
authors.forename: F
authors.initials: F
authors.lastname: Carla
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France.
authors.forename: O
authors.initials: O
authors.lastname: Balmes
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
authors.forename: V
authors.initials: V
authors.lastname: Navarro
authors.affiliation: Catalysis Engineering, Chemical Engineering Department, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Vendelbo
authors.affiliation: Catalysis Engineering, Chemical Engineering Department, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
authors.forename: P J
authors.initials: PJ
authors.lastname: Kooyman
authors.affiliation: Haldor Topsøe A/S, Haldor Topsøes Allé 1, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: C F
authors.initials: CF
authors.lastname: Elkjær
authors.affiliation: Haldor Topsøe A/S, Haldor Topsøes Allé 1, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: S
authors.initials: S
authors.lastname: Helveg
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France.
authors.forename: R
authors.initials: R
authors.lastname: Felici
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
authors.forename: J W M
authors.initials: JWM
authors.lastname: Frenken
authors.affiliation: Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands and Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands. i.m.n.groot@lic.leidenuniv.nl.
authors.forename: I M N
authors.identifier: http://orcid.org/0000-0001-9747-3522
authors.initials: IMN
authors.lastname: Groot