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      Oxidación de CO en catalizadores de Pd soportados sobre óxidos mixtos basados en cerio Translated title: CO oxidation on Pd supported catalysts over mixed oxides based on cerium

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          Abstract

          Se prepararon los catalizadores de 0,5Pd/Ce0,6Zr0,4Ox/SiO2; 1,5Pd/Ce0,6Zr0,4Ox/SiO2; 0,5Pd/ Ce0,7Tb0,3Ox/SiO2 y 1,5Pd/Ce0.7Tb0.3Ox/SiO2, utilizando la técnica de impregnación a humedad incipiente a partir de soluciones acuosas de cloruros de paladio, cerio, zirconio y terbio. Los catalizadores fueron caracterizados mediante las técnicas de Fluorescencia de rayos X (XRF), área superficial, Difracción de rayos X (XRD), Quimisorción de CO y Reducción a Temperatura Programada (TPR). El comportamiento catalítico de las muestras fue evaluado a través de la reacción de oxidación de CO. Los resultados de TPR mostraron que la adición de Tb ó Zr promueve la reducibilidad del óxido de cerio a más baja temperatura. Los resultados de quimisorción de CO y TPR permiten concluir que la adición de Pd a los soportes de Ce0,6Zr0,4Ox/SiO2 y Ce0,7Tb0,3Ox/SiO2 generan especies de PdO de distinta naturaleza, las cuales influyen en su comportamiento catalítico. Los resultados de actividad catalítica mostraron que la adición de Zr mejora el comportamiento catalítico de las muestras, siendo el más activo el catalizador de 0,5Pd/Ce0,6Zr0,4Ox/SiO2 (Temperatura de light off = 140 ºC). Las temperaturas de light off reportadas indicaron que la reacción se favorece con bajas cargas de Pd.

          Translated abstract

          The 0,5Pd/Ce0,6Zr0,4Ox/SiO2; 1,5Pd/Ce0,6Zr0,4Ox/SiO2; 0,5Pd/Ce0,7Tb0,3Ox/SiO2 and 1,5Pd/ Ce0,7Tb0,3Ox/SiO2 catalysts were prepared by incipient wetness impregnation technique from aqueous solutions of palladium, cerium, zirconium and terbium chlorides. The catalysts were characterized by X-ray fluorescence (XRF), surface area, X-ray diffraction (XRD), CO chemisorption and Temperature-programmed reduction (TPR). The catalytic behavior was studied using CO oxidation reaction. The TPR results showed that the addition of Tb or Zr promoted the reducibility of cerium oxide at lower temperatures. CO chemisorptions and TPR results allowed to concluded that Pd addition to Ce0,6Zr0,4Ox/SiO2 and Ce0,7Tb0,3Ox/SiO2 supports generated PdO species of different nature that influence in the catalytic performance. The catalytic activity results showed that Zr addition enhances the catalytic activity of the samples and 0,5Pd/Ce0,6Zr0,4Ox/SiO2 catalyst was the most active (Light off temperature = 140 ºC). The light-off temperatures indicated that low Pd loading favored the reaction.

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          Most cited references21

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          Rh-Loaded CeO2-ZrO2 Solid-Solutions as Highly Efficient Oxygen Exchangers: Dependence of the Reduction Behavior and the Oxygen Storage Capacity on the Structural-Properties

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            Hydrogen chemisorption on ceria: influence of the oxide surface area and degree of reduction

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              Redox Property–Local Structure Relationships in the Rh-Loaded CeO2–ZrO2Mixed Oxides

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rtfiuz
                Revista Técnica de la Facultad de Ingeniería Universidad del Zulia
                Rev. Téc. Ing. Univ. Zulia
                Facultad de Ingeniería, Universidad del Zulia
                0254-0770
                April 2011
                : 34
                : 2
                : 097-106
                Affiliations
                [1 ] Universidad del Zulia Venezuela
                [2 ] Instituto Zuliano de Investigaciones Tecnológicas Venezuela
                Article
                S0254-07702011000200001
                c6a2d4c1-82ef-4358-9240-0bfbe2424bf4

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Venezuela

                Self URI (journal page): http://www.scielo.org.ve/scielo.php?script=sci_serial&pid=0254-0770&lng=en
                Categories
                ENGINEERING, MULTIDISCIPLINARY

                General engineering
                catalizadores de tres vías,XRD,TPR,oxidación de CO,CO oxidation,three-way catalysts

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