title: Total oxidation of toluene over calcined trimetallic hydrotalcites type catalysts.
abstract: Two trimetallic ZnCuAl and MnCuAl hydrotalcites have been successfully synthesized by a co-precipitation method. The manganese based material was identified as a new hydrotalcite phase. Both lamellar precursors were calcined at 450 and 600 degrees C and the resulting catalysts were tested on reaction of total oxidation of toluene. The solids were characterized by X-ray diffraction, thermal analysis, atomic absorption spectroscopy, Fourier transformed infrared spectroscopy, N(2) adsorption and H(2) temperature-programmed reduction. It was found that ZnCuAl materials are composed of copper and zinc oxides supported on alumina; while MnCuAl ones comprise basically spinel phases, which were not completely identified. The catalytic behavior of the calcined samples showed that Mn hydrotalcite calcined at 450 degrees C exhibited the best catalytic performance that corresponds to 100% toluene conversion into CO(2) at about 300 degrees C.
authors.affiliation: Instituto Superior Técnico, IBB - Centro de Engenharia Biológica e Química, Universidade Tecnica de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal.
authors.forename: Luz A
authors.initials: LA
authors.lastname: Palacio
authors.forename: Juliana
authors.initials: J
authors.lastname: Velásquez
authors.forename: Adriana
authors.initials: A
authors.lastname: Echavarría
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Faro
authors.forename: F Ramôa
authors.initials: FR
authors.lastname: Ribeiro
authors.forename: M Filipa
authors.initials: MF
authors.lastname: Ribeiro
mesh_terms: D000536:Aluminum Hydroxide / Q000138:chemical synthesis / Q000737:chemistry*; D002245:Carbon Dioxide; D002384:Catalysis; D015386:Hazardous Substances; D007220:Industrial Waste / Q000517:prevention & control*; D008276:Magnesium Hydroxide / Q000138:chemical synthesis / Q000737:chemistry*; D008345:Manganese; D010084:Oxidation-Reduction; D013696:Temperature; D014050:Toluene / Q000737:chemistry*; D015032:Zinc
chemical_list: D015386:Hazardous Substances; D007220:Industrial Waste; D002245:Carbon Dioxide; C010467:hydrotalcite; D014050:Toluene; D008345:Manganese; D000536:Aluminum Hydroxide; D015032:Zinc; D008276:Magnesium Hydroxide