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dc.contributor.authorMeza Fuentes, Edgardo-
dc.contributor.authorFaro Júnior, Arnaldo da Costa-
dc.contributor.authorSilva, Tatiana de Freitas-
dc.contributor.authorAssaf, José Mansur-
dc.contributor.authorVarela, Maria do Carmo Rangel Santos-
dc.creatorMeza Fuentes, Edgardo-
dc.creatorFaro Júnior, Arnaldo da Costa-
dc.creatorSilva, Tatiana de Freitas-
dc.creatorAssaf, José Mansur-
dc.creatorVarela, Maria do Carmo Rangel Santos-
dc.date.accessioned2012-02-24T13:49:24Z-
dc.date.issued2011-
dc.identifier.issn0920-5861-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/5440-
dc.descriptiontexto completo: acesso restrito. p.290– 296.pt_BR
dc.description.abstractNickel or copperbased catalysts were obtained from hydrotalcitelike precursors in this work, in order to find catalysts able to work at intermediates temperatures (200–350 ◦C) in water gas shift reaction (WGSR). Samples based on nickel (or copper), aluminum and zinc were obtained by coprecipitation, characterized by several techniques and evaluated in WGSR. Zinc caused changes in the cell parameters of hydrotalcitetype structure, which determined the structural and textural properties of calcined samples. For all catalysts, zinc oxide was detected. In the case of nickelbased hydrotalcites, aluminum cations were incorporated into nickel oxide lattice, hindering reduction; however, the addition of zinc decreased this effect. For copperbased samples, aluminum entered into copper oxide lattice and the copper reduction decreased with the increase of zinc amount in solids. After calcination, copper catalysts showed lower specific surface areas than nickel ones. Zinc led to the production of smaller and more reducible nickel oxide particles, due to the decrease of their interaction with Al3+ species; under reduction, they produced small metallic nickel particles, which are supposed to be highly active and selective to carbon dioxide. Copper catalysts were less active to WGSR, as compared to the nickel ones, this can be related to their low specific surface areas. All catalysts were active in the range of 200–350 ◦C and thus are candidates to be used in a single stage of WGSR at intermediate temperatures.pt_BR
dc.language.isoenpt_BR
dc.sourcehttp://dx.doi.org/10.1016/j.cattod.2011.03.082-
dc.subjectNickelpt_BR
dc.subjectCopperpt_BR
dc.subjectHydrotalcitespt_BR
dc.subjectAluminumpt_BR
dc.subjectWGSRpt_BR
dc.subjectHydrogenpt_BR
dc.titleA comparison between copper and nickelbased catalysts obtained from hydrotalcitelike precursors for WGSRpt_BR
dc.title.alternativeCatalysis Todaypt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 171.pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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