Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation

Autores
Santana Santos, Manuela de; Marchetti, Sergio Gustavo; Albornoz, Alberto; Rangel, Maria do Carmo
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The ethylbenzene dehydrogenation in the presence of steam is the dominant technology for styrene production, one of the most important high value chemicals. The most widely used industrial catalyst comprises potassium-promoted iron oxide, which deactivates with time, due to potassium loss. In order to find alternative free-potassium catalysts, the effect of lanthanum on hematite-based catalysts was studied in this work. Samples with different amounts of lanthanum and prepared with different precipitants (ammonium hydroxide, sodium carbonate and sodium hydroxide) were obtained. It was found that lanthanum led to the production of solids with small particles when ammonium hydroxide was used, a fact which was assigned to lanthanum species on the surface where they keep the hematite particles apart avoiding sinterization. On the other hand, bigger particles were produced when sodium hydroxide and sodium carbonate are used, which resulted in solids with small specific surface areas. This was related to the sodium species which covered the surface impairing the lanthanum action. The most promising catalyst was that prepared with ammonium hydroxide and with La/Fe = 0.1, which showed the highest specific activity and the highest activity per area. In this solid, lanthanum acts as a structural promoter
Fil: Santana Santos, Manuela de. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; Brasil
Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Albornoz, Alberto. Instituto Venezolano de Investigaciones Científicas; Venezuela
Fil: Rangel, Maria do Carmo. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; Brasil
Materia
Ethylbenzene
Styrene
Lanthanum
Hematite
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/30406
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/30406
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenationSantana Santos, Manuela deMarchetti, Sergio GustavoAlbornoz, AlbertoRangel, Maria do CarmoEthylbenzeneStyreneLanthanumHematitehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The ethylbenzene dehydrogenation in the presence of steam is the dominant technology for styrene production, one of the most important high value chemicals. The most widely used industrial catalyst comprises potassium-promoted iron oxide, which deactivates with time, due to potassium loss. In order to find alternative free-potassium catalysts, the effect of lanthanum on hematite-based catalysts was studied in this work. Samples with different amounts of lanthanum and prepared with different precipitants (ammonium hydroxide, sodium carbonate and sodium hydroxide) were obtained. It was found that lanthanum led to the production of solids with small particles when ammonium hydroxide was used, a fact which was assigned to lanthanum species on the surface where they keep the hematite particles apart avoiding sinterization. On the other hand, bigger particles were produced when sodium hydroxide and sodium carbonate are used, which resulted in solids with small specific surface areas. This was related to the sodium species which covered the surface impairing the lanthanum action. The most promising catalyst was that prepared with ammonium hydroxide and with La/Fe = 0.1, which showed the highest specific activity and the highest activity per area. In this solid, lanthanum acts as a structural promoterFil: Santana Santos, Manuela de. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; BrasilFil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Albornoz, Alberto. Instituto Venezolano de Investigaciones Científicas; VenezuelaFil: Rangel, Maria do Carmo. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; BrasilElsevier Science2008-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/30406Santana Santos, Manuela de; Marchetti, Sergio Gustavo; Albornoz, Alberto; Rangel, Maria do Carmo; Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation; Elsevier Science; Catalysis Today; 133-135; 1-12-2008; 160-1670920-5861CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0920586107008954info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:02:50Zoai:ri.conicet.gov.ar:11336/30406instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:02:50.876CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
title Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
spellingShingle Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
Santana Santos, Manuela de
Ethylbenzene
Styrene
Lanthanum
Hematite
title_short Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
title_full Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
title_fullStr Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
title_full_unstemmed Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
title_sort Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation
dc.creator.none.fl_str_mv Santana Santos, Manuela de
Marchetti, Sergio Gustavo
Albornoz, Alberto
Rangel, Maria do Carmo
author Santana Santos, Manuela de
author_facet Santana Santos, Manuela de
Marchetti, Sergio Gustavo
Albornoz, Alberto
Rangel, Maria do Carmo
author_role author
author2 Marchetti, Sergio Gustavo
Albornoz, Alberto
Rangel, Maria do Carmo
author2_role author
author
author
dc.subject.none.fl_str_mv Ethylbenzene
Styrene
Lanthanum
Hematite
topic Ethylbenzene
Styrene
Lanthanum
Hematite
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The ethylbenzene dehydrogenation in the presence of steam is the dominant technology for styrene production, one of the most important high value chemicals. The most widely used industrial catalyst comprises potassium-promoted iron oxide, which deactivates with time, due to potassium loss. In order to find alternative free-potassium catalysts, the effect of lanthanum on hematite-based catalysts was studied in this work. Samples with different amounts of lanthanum and prepared with different precipitants (ammonium hydroxide, sodium carbonate and sodium hydroxide) were obtained. It was found that lanthanum led to the production of solids with small particles when ammonium hydroxide was used, a fact which was assigned to lanthanum species on the surface where they keep the hematite particles apart avoiding sinterization. On the other hand, bigger particles were produced when sodium hydroxide and sodium carbonate are used, which resulted in solids with small specific surface areas. This was related to the sodium species which covered the surface impairing the lanthanum action. The most promising catalyst was that prepared with ammonium hydroxide and with La/Fe = 0.1, which showed the highest specific activity and the highest activity per area. In this solid, lanthanum acts as a structural promoter
Fil: Santana Santos, Manuela de. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; Brasil
Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Albornoz, Alberto. Instituto Venezolano de Investigaciones Científicas; Venezuela
Fil: Rangel, Maria do Carmo. Universidade Federal de Bahia. Instituto de Química. Grupo de Estudios en Cinética e Catalise; Brasil
description The ethylbenzene dehydrogenation in the presence of steam is the dominant technology for styrene production, one of the most important high value chemicals. The most widely used industrial catalyst comprises potassium-promoted iron oxide, which deactivates with time, due to potassium loss. In order to find alternative free-potassium catalysts, the effect of lanthanum on hematite-based catalysts was studied in this work. Samples with different amounts of lanthanum and prepared with different precipitants (ammonium hydroxide, sodium carbonate and sodium hydroxide) were obtained. It was found that lanthanum led to the production of solids with small particles when ammonium hydroxide was used, a fact which was assigned to lanthanum species on the surface where they keep the hematite particles apart avoiding sinterization. On the other hand, bigger particles were produced when sodium hydroxide and sodium carbonate are used, which resulted in solids with small specific surface areas. This was related to the sodium species which covered the surface impairing the lanthanum action. The most promising catalyst was that prepared with ammonium hydroxide and with La/Fe = 0.1, which showed the highest specific activity and the highest activity per area. In this solid, lanthanum acts as a structural promoter
publishDate 2008
dc.date.none.fl_str_mv 2008-12-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/30406
Santana Santos, Manuela de; Marchetti, Sergio Gustavo; Albornoz, Alberto; Rangel, Maria do Carmo; Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation; Elsevier Science; Catalysis Today; 133-135; 1-12-2008; 160-167
0920-5861
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30406
identifier_str_mv Santana Santos, Manuela de; Marchetti, Sergio Gustavo; Albornoz, Alberto; Rangel, Maria do Carmo; Effect of lathanum addition on the properties of patassium-free catalysts for ethylbenzene dehydrogenation; Elsevier Science; Catalysis Today; 133-135; 1-12-2008; 160-167
0920-5861
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0920586107008954
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844613837167263744
score 13.070432

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