title: On the reactivity of carbon supported Pd nanoparticles during NO reduction: unraveling a metal-support redox interaction.
abstract: Pd nanoparticles (NPs) were successfully obtained by the reduction of PdCl2 with L-ascorbic acid, whose morphology was revealed by HRTEM to be a worm-like system, formed by linked crystallite clusters with an average short-axis diameter of 5.42 nm. In situ UV-vis absorption measurements were used to monitor their formation, while XPS and XRD characterization confirmed the NPs' metallic state. A straightforward way to support the obtained Pd NPs on activated carbon (AC) was used to prepare a catalyst for NO decomposition reaction. The Pd/AC catalysts proved to be highly active in the temperature range of 323 to 673 K, and a redox mechanism is proposed, where the catalyst's active sites are oxidized by NO and reduced by carbon, emitting CO2 and enhancing their capacity to absorb and dissociate NO.
authors.affiliation: Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
authors.forename: Marcus V
authors.initials: MV
authors.lastname: Castegnaro
authors.forename: Alex S
authors.initials: AS
authors.lastname: Kilian
authors.forename: Ione M
authors.initials: IM
authors.lastname: Baibich
authors.forename: Maria C M
authors.initials: MC
authors.lastname: Alves
authors.forename: Jonder
authors.initials: J
authors.lastname: Morais
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D009569:Nitric Oxide; D010165:Palladium; D002244:Carbon; C008756:palladium chloride; D001205:Ascorbic Acid