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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/13208

Title: Preparation and characterization of Ru/MgO-Al2O3 catalysts for methane steam reforming
Other Titles: Catalysis Today
Authors: Carvalho, Luciene Santos de
Martins, André Rosa
Reyes, Patrício
Oportus, Marcelo
Albornoz, Alberto
Vicentini, Valéria
Varela, Maria do Carmo Rangel Santos
Keywords: Steam reforming;Hydrogen production;Ruthenium catalyst;Mg-Al oxide
Issue Date: 2009
Abstract: The preparation and characterization of aluminum and magnesium oxides-supported ruthenium were described in this work, aiming to compare different supports to methane steam reforming catalysts for producing hydrogen. Gama-alumina-supported ruthenium and periclase-supported ruthenium were produced. The addition of small amounts of magnesium to alumina-supported ruthenium in the range of Mg/Al (molar) = 0.2–0.5 did not change the gama-alumina structure while high amounts (Mg/Al (molar) = 5) led to the production of periclase. Magnesium caused a decrease of specific surface area of alumina-supported ruthenium catalysts and this effect increased with the amount of the metal in solids. Magnesium also decreased the acidity of alumina-supported ruthenium and generated electron deficient ruthenium species, besides increasing their interaction with the support. The addition of magnesium increased the ruthenium dispersion but did not increase the methane conversion, suggesting that it negatively changed the electron properties of ruthenium towards methane conversion. However, it avoided deactivation during reaction and changed the activity for the water gas shift reaction, allowing tailoring the hydrogen to carbon monoxide molar ratio. The catalysts showed activity close or higher than a commercial sample, indicating that they are promising for the reaction, with the advantage that it can be tailored for several applications.
Description: Texto completo: acesso restrito. p. 52-60
URI: http://www.repositorio.ufba.br/ri/handle/ri/13208
ISSN: 0920-5861
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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