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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/8499
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dc.contributor.authorVarela, Maria do Carmo Rangel Santos-
dc.contributor.authorSassaki, Renato Massami-
dc.contributor.authorGalembeck, Fernando-
dc.creatorVarela, Maria do Carmo Rangel Santos-
dc.creatorSassaki, Renato Massami-
dc.creatorGalembeck, Fernando-
dc.date.accessioned2013-02-18T17:34:10Z-
dc.date.issued1995-
dc.identifier.issn1011-372X-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/8499-
dc.descriptionTexto completo: acesso restrito. p.237-254pt_BR
dc.description.abstractChromium-doped magnetite is the traditional catalyst used in the high temperature shift reaction in industrial processes. This work reports a method for preparing this solid, by heating chromium-doped iron(III)hydroxoacetates (IHA), prepared both by coprecipitation and by impregnation. This method provides the production of the catalyst in its active form avoiding the step of activation in industrial processes. It was noted that the presence of chromium affects magnetite formation as well as its characteristics. IHA containing chromium produces magnetite at higher temperature than does the pure IHA. Chromium-doped magnetites have higher surface areas, are less crystalline, have lower Fe(II)/Fe(III) ratios and are catalysts more active than those obtained from plain IHA. These effects depend on the preparation method of the precursor. It was also found that the impregnated sample is made of aggregates of a few crystals whereas the coprecipitate is made of smaller polycrystalline particles. In addition, the coprecipitation method leads to a more even distribution of chromium in solids. These observations are consistent with the best performance shown by the catalyst prepared by coprecipitation.pt_BR
dc.language.isoenpt_BR
dc.sourcehttp://dx.doi.org/10.1007/BF00814228pt_BR
dc.subjectmagnetite formationpt_BR
dc.subjectchromium-doped magnetitept_BR
dc.subjectHTS catalystpt_BR
dc.subjectiron(III)hydroxoacetatept_BR
dc.titleEffect of chromium on magnetite formationpt_BR
dc.title.alternativeCatalysis Letterspt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 33, n. 3-4pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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