Ação promotora do berílio em catalisadores da síntese do estireno

Detalhes bibliográficos
Autor(a) principal: Barbosa, Mário Nilo Mendes
Data de Publicação: 1997
Outros Autores: Carvalho, Marly Fernandes Araújo, Varela, Maria do Carmo Rangel Santos
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/3838
Resumo: p. 463-468.
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spelling Barbosa, Mário Nilo MendesCarvalho, Marly Fernandes AraújoVarela, Maria do Carmo Rangel SantosBarbosa, Mário Nilo MendesCarvalho, Marly Fernandes AraújoVarela, Maria do Carmo Rangel Santos2011-11-23T13:11:13Z2011-11-23T13:11:13Z19970100-4042http://www.repositorio.ufba.br/ri/handle/ri/3838v. 20, n. 5.p. 463-468.Promotor action of beryllium in catalysts for styrene production. The catalytic dehydrogenation of ethylbenzene in presence of steam is the main commercial route to produce styrene. The industrial catalysts are potassium- and chromia-doped hematite which show low surface areas leading to bad performance and short life. In order to develop catalysts with high areas, the effect of beryllium on the textural properties and on the catalytic performance of this iron oxide was studied. The influence of the amount of the dopant, the starting material and the calcination temperature were also studied. In sample preparations, iron and beryllium salts (nitrate or sulfate) were hydrolyzed with ammonia and then calcinated. The experiments followed a factorial design with two variables in two levels (Fe/Be= 3 and 7; calcination temperature= 500 and 700ºC). Solids without any dopant were also prepared. Samples were characterized by elemental analysis, infrared spectroscopy, surface area and porosity measurements, X-ray diffraction, DSC and TG. The catalysts were tested in a microreactor at 524ºC and 1 atm, by using a mole ratio of steam/ ethylbenzene=10. The selectivity was measured by monitoring styrene, benzene and toluene formation. It was found that the effect of beryllium on the characteristics of hematite and on its catalytic performance depends on the starting material and on the amount of dopant. Surface areas increased due to the dopant as well as the nature of the precursor; samples produced by beryllium sulfate showed higher areas. Beryllium-doped solids showed a higher catalytic activity when compared to pure hematite, but no significant influence of the anion of starting material was noted. It can be concluded that beryllium acts as both textural and structural promoter. Samples with Fe/Be= 3, heated at 500ºC, lead to the highest conversion and were the most selective. However, catalysts prepared from beryllium sulfate are the most promising to ethylbenzene dehydrogenation due to their high surface area which could lead to a longer life.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2011-11-23T13:11:13Z No. of bitstreams: 1 4885.pdf: 357450 bytes, checksum: 77fc028ed78281c5a830ad1f23e0aa71 (MD5)Made available in DSpace on 2011-11-23T13:11:13Z (GMT). No. of bitstreams: 1 4885.pdf: 357450 bytes, checksum: 77fc028ed78281c5a830ad1f23e0aa71 (MD5) Previous issue date: 1997São PauloEthylbenzene dehydrogenationStyreneIron oxidesAção promotora do berílio em catalisadores da síntese do estirenoQuímica Novainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleporreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINAL4885.pdf4885.pdfapplication/pdf357450https://repositorio.ufba.br/bitstream/ri/3838/1/4885.pdf77fc028ed78281c5a830ad1f23e0aa71MD51LICENSElicense.txtlicense.txttext/plain1906https://repositorio.ufba.br/bitstream/ri/3838/2/license.txteb3d8eda53b02e0d38d778179053be6dMD52ri/38382022-08-08 13:17:35.645oai:repositorio.ufba.br:ri/3838Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-08-08T16:17:35Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Ação promotora do berílio em catalisadores da síntese do estireno
dc.title.alternative.pt_BR.fl_str_mv Química Nova
title Ação promotora do berílio em catalisadores da síntese do estireno
spellingShingle Ação promotora do berílio em catalisadores da síntese do estireno
Barbosa, Mário Nilo Mendes
Ethylbenzene dehydrogenation
Styrene
Iron oxides
title_short Ação promotora do berílio em catalisadores da síntese do estireno
title_full Ação promotora do berílio em catalisadores da síntese do estireno
title_fullStr Ação promotora do berílio em catalisadores da síntese do estireno
title_full_unstemmed Ação promotora do berílio em catalisadores da síntese do estireno
title_sort Ação promotora do berílio em catalisadores da síntese do estireno
author Barbosa, Mário Nilo Mendes
author_facet Barbosa, Mário Nilo Mendes
Carvalho, Marly Fernandes Araújo
Varela, Maria do Carmo Rangel Santos
author_role author
author2 Carvalho, Marly Fernandes Araújo
Varela, Maria do Carmo Rangel Santos
author2_role author
author
dc.contributor.author.fl_str_mv Barbosa, Mário Nilo Mendes
Carvalho, Marly Fernandes Araújo
Varela, Maria do Carmo Rangel Santos
Barbosa, Mário Nilo Mendes
Carvalho, Marly Fernandes Araújo
Varela, Maria do Carmo Rangel Santos
dc.subject.por.fl_str_mv Ethylbenzene dehydrogenation
Styrene
Iron oxides
topic Ethylbenzene dehydrogenation
Styrene
Iron oxides
description p. 463-468.
publishDate 1997
dc.date.issued.fl_str_mv 1997
dc.date.accessioned.fl_str_mv 2011-11-23T13:11:13Z
dc.date.available.fl_str_mv 2011-11-23T13:11:13Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/3838
dc.identifier.issn.none.fl_str_mv 0100-4042
dc.identifier.number.pt_BR.fl_str_mv v. 20, n. 5.
identifier_str_mv 0100-4042
v. 20, n. 5.
url http://www.repositorio.ufba.br/ri/handle/ri/3838
dc.language.iso.fl_str_mv por
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reponame_str Repositório Institucional da UFBA
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