title: Catalytic reduction of NO2 with hydrogen on Pt field emitter tips: kinetic instabilities on the nanoscale.
abstract: The catalytic reduction of NO(2) with hydrogen on a Pt field emitter tip is investigated using both field electron microscopy (FEM) and field ion microscopy (FIM). A rich variety of nonlinear behavior and unusually high catalytic activity around the {012} facets are observed. Our FEM investigations reveal that the correlation function exhibits damped oscillations with a decaying envelope, showing that molecular noise will influence the dynamics of the oscillations. The dependence of the oscillatory period on the P(H(2))/P(NO(2)) pressure ratios is analyzed. Similar patterns are reported under FIM conditions. Corresponding density functional theory (DFT) calculations for the adsorption of NO(2) on Pt{012} in the presence of an external electric field are performed in order to gain an atomistic understanding of the underlying nonlinear phenomena.
authors.affiliation: Centre for Nonlinear Phenomena and Complex Systems, Campus Plaine-CP 231, Université Libre de Bruxelles, B-1050 Brussels, Belgium.
authors.forename: J-S
authors.initials: JS
authors.lastname: McEwen
authors.forename: P
authors.initials: P
authors.lastname: Gaspard
authors.forename: Y
authors.initials: Y
authors.lastname: De Decker
authors.forename: C
authors.initials: C
authors.lastname: Barroo
authors.forename: T
authors.initials: T
authors.lastname: Visart de Bocarmé
authors.forename: N
authors.initials: N
authors.lastname: Kruse
mesh_terms: D000327:Adsorption; D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008854:Microscopy, Electron; D009585:Nitrogen Dioxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D010984:Platinum; D006859:Hydrogen; D009585:Nitrogen Dioxide