title: Reduction of NO by CO using Pd-CeTb and Pd-CeZr catalysts supported on SiO2 and La2O3-Al2O3.
abstract: The catalytic activity of Pd catalysts supported on Ce0.73Tb0.27Ox/SiO2, Ce0.6Zr0.4Ox/SiO2, Ce0.73Tb0.27Ox/La2O3-Al2O3 and Ce0.6Zr0.4Ox/La2O3-Al2O3 was studied using the reduction of NO by CO. The catalysts were characterized by X-ray fluorescence, surface area, X-ray diffraction, temperature-programmed reduction, CO chemisorption and oxygen storage capacity. Temperature-programmed reduction results indicated that Tb or Zr incorporation improves the reducibility and oxygen storage capacity. CO chemisorption data suggested the presence of large PdO particles due to the low CO/Pd ratio. No significant differences were obtained in light off temperatures (TLight off) for all Pd catalysts and the most active was 1.5%Pd/Ce0.6Zr0.4Ox/SiO2.
authors.affiliation: Instituto de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 4003A, Venezuela. Electronic address: vferrer@fing.luz.edu.ve.
authors.forename: Victor
authors.initials: V
authors.lastname: Ferrer
authors.affiliation: Instituto de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 4003A, Venezuela.
authors.forename: Dora
authors.initials: D
authors.lastname: Finol
authors.affiliation: Instituto de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 4003A, Venezuela.
authors.forename: Roger
authors.initials: R
authors.lastname: Solano
authors.affiliation: Instituto de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 4003A, Venezuela.
authors.forename: Alexander
authors.initials: A
authors.lastname: Moronta
authors.affiliation: Instituto Zuliano de Investigaciones Tecnológicas, km 15 carretera Vía a la Cañada, Apartado 331, Venezuela.
authors.forename: Miguel
authors.initials: M
authors.lastname: Ramos
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D008670:Metals / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D008670:Metals; D010087:Oxides; D009569:Nitric Oxide; D002248:Carbon Monoxide
keywords: Mixed oxides; OSC; Reduction of NO by CO; Three way catalysts