Effect of chromium on magnetite formation

Detalhes bibliográficos
Autor(a) principal: Varela, Maria do Carmo Rangel Santos
Data de Publicação: 1995
Outros Autores: Sassaki, Renato Massami, Galembeck, Fernando
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/8499
Resumo: Texto completo: acesso restrito. p.237-254
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spelling Varela, Maria do Carmo Rangel SantosSassaki, Renato MassamiGalembeck, FernandoVarela, Maria do Carmo Rangel SantosSassaki, Renato MassamiGalembeck, Fernando2013-02-18T17:34:10Z19951011-372Xhttp://www.repositorio.ufba.br/ri/handle/ri/8499v. 33, n. 3-4Texto completo: acesso restrito. p.237-254Chromium-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.Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-02-18T17:34:10Z No. of bitstreams: 1 Rangel.pdf: 4469776 bytes, checksum: 87ebddb408fb5402705193048e0987bd (MD5)Made available in DSpace on 2013-02-18T17:34:10Z (GMT). No. of bitstreams: 1 Rangel.pdf: 4469776 bytes, checksum: 87ebddb408fb5402705193048e0987bd (MD5) Previous issue date: 1995http://dx.doi.org/10.1007/BF00814228reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAmagnetite formationchromium-doped magnetiteHTS catalystiron(III)hydroxoacetateEffect of chromium on magnetite formationCatalysis Lettersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01enginfo:eu-repo/semantics/openAccessORIGINALRangel.pdfRangel.pdfapplication/pdf4469776https://repositorio.ufba.br/bitstream/ri/8499/1/Rangel.pdf87ebddb408fb5402705193048e0987bdMD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/8499/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXTRangel.pdf.txtRangel.pdf.txtExtracted texttext/plain34372https://repositorio.ufba.br/bitstream/ri/8499/3/Rangel.pdf.txt6f77d17776fe9bb9ec64ae38cb18dfd0MD53ri/84992022-07-05 14:03:01.26oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:01Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Effect of chromium on magnetite formation
dc.title.alternative.pt_BR.fl_str_mv Catalysis Letters
title Effect of chromium on magnetite formation
spellingShingle Effect of chromium on magnetite formation
Varela, Maria do Carmo Rangel Santos
magnetite formation
chromium-doped magnetite
HTS catalyst
iron(III)hydroxoacetate
title_short Effect of chromium on magnetite formation
title_full Effect of chromium on magnetite formation
title_fullStr Effect of chromium on magnetite formation
title_full_unstemmed Effect of chromium on magnetite formation
title_sort Effect of chromium on magnetite formation
author Varela, Maria do Carmo Rangel Santos
author_facet Varela, Maria do Carmo Rangel Santos
Sassaki, Renato Massami
Galembeck, Fernando
author_role author
author2 Sassaki, Renato Massami
Galembeck, Fernando
author2_role author
author
dc.contributor.author.fl_str_mv Varela, Maria do Carmo Rangel Santos
Sassaki, Renato Massami
Galembeck, Fernando
Varela, Maria do Carmo Rangel Santos
Sassaki, Renato Massami
Galembeck, Fernando
dc.subject.por.fl_str_mv magnetite formation
chromium-doped magnetite
HTS catalyst
iron(III)hydroxoacetate
topic magnetite formation
chromium-doped magnetite
HTS catalyst
iron(III)hydroxoacetate
description Texto completo: acesso restrito. p.237-254
publishDate 1995
dc.date.issued.fl_str_mv 1995
dc.date.accessioned.fl_str_mv 2013-02-18T17:34:10Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/8499
dc.identifier.issn.none.fl_str_mv 1011-372X
dc.identifier.number.pt_BR.fl_str_mv v. 33, n. 3-4
identifier_str_mv 1011-372X
v. 33, n. 3-4
url http://www.repositorio.ufba.br/ri/handle/ri/8499
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1007/BF00814228
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
instname_str Universidade Federal da Bahia (UFBA)
instacron_str UFBA
institution UFBA
reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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