VI San Luis School and Conference on Surfaces, Interfaces and Catalysis
Abstract
The steps of the CO oxidation reaction on a Au/CeO2 catalyst was quantitatively investigated using a novel DRIFT cell/micro-reactor. The design and characterization of this DRIFT cell/micro-reactor, coupled with mass spectrometry, to perform operando and transient studies of reactions at the gas/solid interface is presented. The cell was modeled and experimentally validated to obtain kinetic parameters of reactions under true chemical control conditions. Light-off curves of activity vs temperature, step-reaction and excitation modulation spectroscopy (MES) experiments were carried out. TOF and apparent activation energy were identical to the measured using a conventional reactor. The simultaneous detection of gas phase concentrations by MS and the intensity of the IR signals allowed the quantification of surface species active in the reaction: i) Au0-CO (2110 cm-1), Au+-CO (2125 cm-1), ii) carbonate adsorbed on the ceria support (1700-1200 cm-1). Moreover, the amount of adsorbed oxygen could also be quantified. Kinetic constants of CO adsorption and oxidation were measured.Fil: Aguirre, Alejo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Collins, Sebastián Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaVI San Luis School and Conference on Surfaces, Interfaces and CatalysisSanta FeArgentinaInstituto de Desarrollo Tecnológico para la Industria QuímicaUniversidad Nacional del Litora
