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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/13208
Tipo: Artigo de Periódico
Título: Preparation and characterization of Ru/MgO-Al2O3 catalysts for methane steam reforming
Título(s) alternativo(s): Catalysis Today
Autor(es): Carvalho, Luciene Santos de
Martins, André Rosa
Reyes, Patrício
Oportus, Marcelo
Albornoz, Alberto
Vicentini, Valéria
Varela, Maria do Carmo Rangel Santos
Autor(es): Carvalho, Luciene Santos de
Martins, André Rosa
Reyes, Patrício
Oportus, Marcelo
Albornoz, Alberto
Vicentini, Valéria
Varela, Maria do Carmo Rangel Santos
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.
Palavras-chave: Steam reforming
Hydrogen production
Ruthenium catalyst
Mg-Al oxide
URI: http://www.repositorio.ufba.br/ri/handle/ri/13208
Data do documento: 2009
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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