Ethylbenzene production over platinum catalysts supported on modified KY zeolites
- Autores
- Fonseca, Juliana Da Silva Lima; Júnior, Arnaldo Da Costa Faro; Grau, Javier Mario; Rangel, Maria do Carmo
- Año de publicación
- 2010
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Platinum catalysts supported on zeolite KY (Si/Al = 12.7), modified with magnesium, calcium or barium, were evaluated in n-octane reforming to produce ethylbenzene. The catalysts were characterized by nitrogen adsorption, 27Al and 29Si solid state nuclear magnetic resonance, Fourier transform infrared spectroscopy using carbon monoxide or pyridine, metal dispersion measurements and programmed temperature oxidation. No significant structural change was noted for the solids due to the dopants except
for barium, which decreased the specific surface area, due to the partial blockage of the zeolite channels by the large size ions. However, a decrease was noted for all samples due to platinum, which partially blocked the zeolite channels. Barium also decreased the crystallinity while platinum caused this effect only for calcium and barium-containing samples, due to the structure partial collapse. Metallic platinum species in several electronic states were detected in the cages of zeolite, barium-containing catalyst showing the most electron-enriched platinum atoms. The amount of Lewis and Brønsted acid sites increased due to magnesium and calcium but barium increased only the amount of Lewis acid sites, as compared to potassium-containing solid. The catalysts with magnesium and barium showed the same platinum dispersion, which was higher than the one containing calcium. All catalysts were active in n-octane reforming at 723K and selective to ethylbenzene, but the conversion dropped with time reaction due to the decrease of specific surface area and to coke deposition. The calcium-containing sample produced the hardest coke, which led to the highest drop in conversion. The n-octane conversion was supposed to occur by a monofunctional mechanism but the bifunctional mechanism also seemed to occur due to the residual acidity of the catalysts. The calcium and barium-containing catalysts were the most selective to
ethylbenzene, due to electron-enriched platinum species related to promoters, but the low ethylbenzene selectivity for the magnesium-containing catalyst was compensated by its high conversion, resulting in similar yields for all catalysts.
Fil: Fonseca, Juliana Da Silva Lima. Universidade Federal da Bahia; Brasil
Fil: Júnior, Arnaldo Da Costa Faro. Universidade Federal do Rio de Janeiro; Brasil
Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
Fil: Rangel, Maria do Carmo. Universidade Federal da Bahia; Brasil - Materia
-
N-Octane Reforming
Y Zeolite
Ethylbenzene
Coke
Barium
Calcium
Magnesium - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/54027
Ver los metadatos del registro completo
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Ethylbenzene production over platinum catalysts supported on modified KY zeolitesFonseca, Juliana Da Silva LimaJúnior, Arnaldo Da Costa FaroGrau, Javier MarioRangel, Maria do CarmoN-Octane ReformingY ZeoliteEthylbenzeneCokeBariumCalciumMagnesiumhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Platinum catalysts supported on zeolite KY (Si/Al = 12.7), modified with magnesium, calcium or barium, were evaluated in n-octane reforming to produce ethylbenzene. The catalysts were characterized by nitrogen adsorption, 27Al and 29Si solid state nuclear magnetic resonance, Fourier transform infrared spectroscopy using carbon monoxide or pyridine, metal dispersion measurements and programmed temperature oxidation. No significant structural change was noted for the solids due to the dopants except<br />for barium, which decreased the specific surface area, due to the partial blockage of the zeolite channels by the large size ions. However, a decrease was noted for all samples due to platinum, which partially blocked the zeolite channels. Barium also decreased the crystallinity while platinum caused this effect only for calcium and barium-containing samples, due to the structure partial collapse. Metallic platinum species in several electronic states were detected in the cages of zeolite, barium-containing catalyst showing the most electron-enriched platinum atoms. The amount of Lewis and Brønsted acid sites increased due to magnesium and calcium but barium increased only the amount of Lewis acid sites, as compared to potassium-containing solid. The catalysts with magnesium and barium showed the same platinum dispersion, which was higher than the one containing calcium. All catalysts were active in n-octane reforming at 723K and selective to ethylbenzene, but the conversion dropped with time reaction due to the decrease of specific surface area and to coke deposition. The calcium-containing sample produced the hardest coke, which led to the highest drop in conversion. The n-octane conversion was supposed to occur by a monofunctional mechanism but the bifunctional mechanism also seemed to occur due to the residual acidity of the catalysts. The calcium and barium-containing catalysts were the most selective to<br />ethylbenzene, due to electron-enriched platinum species related to promoters, but the low ethylbenzene selectivity for the magnesium-containing catalyst was compensated by its high conversion, resulting in similar yields for all catalysts.Fil: Fonseca, Juliana Da Silva Lima. Universidade Federal da Bahia; BrasilFil: Júnior, Arnaldo Da Costa Faro. Universidade Federal do Rio de Janeiro; BrasilFil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Rangel, Maria do Carmo. Universidade Federal da Bahia; BrasilElsevier Science2010-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54027Fonseca, Juliana Da Silva Lima; Júnior, Arnaldo Da Costa Faro; Grau, Javier Mario; Rangel, Maria do Carmo; Ethylbenzene production over platinum catalysts supported on modified KY zeolites; Elsevier Science; Applied Catalysis A: General; 386; 9-2010; 201-2100926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2010.07.056info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:29Zoai:ri.conicet.gov.ar:11336/54027instacron: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 09:32:29.966CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
title |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
spellingShingle |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites Fonseca, Juliana Da Silva Lima N-Octane Reforming Y Zeolite Ethylbenzene Coke Barium Calcium Magnesium |
title_short |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
title_full |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
title_fullStr |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
title_full_unstemmed |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
title_sort |
Ethylbenzene production over platinum catalysts supported on modified KY zeolites |
dc.creator.none.fl_str_mv |
Fonseca, Juliana Da Silva Lima Júnior, Arnaldo Da Costa Faro Grau, Javier Mario Rangel, Maria do Carmo |
author |
Fonseca, Juliana Da Silva Lima |
author_facet |
Fonseca, Juliana Da Silva Lima Júnior, Arnaldo Da Costa Faro Grau, Javier Mario Rangel, Maria do Carmo |
author_role |
author |
author2 |
Júnior, Arnaldo Da Costa Faro Grau, Javier Mario Rangel, Maria do Carmo |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
N-Octane Reforming Y Zeolite Ethylbenzene Coke Barium Calcium Magnesium |
topic |
N-Octane Reforming Y Zeolite Ethylbenzene Coke Barium Calcium Magnesium |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Platinum catalysts supported on zeolite KY (Si/Al = 12.7), modified with magnesium, calcium or barium, were evaluated in n-octane reforming to produce ethylbenzene. The catalysts were characterized by nitrogen adsorption, 27Al and 29Si solid state nuclear magnetic resonance, Fourier transform infrared spectroscopy using carbon monoxide or pyridine, metal dispersion measurements and programmed temperature oxidation. No significant structural change was noted for the solids due to the dopants except<br />for barium, which decreased the specific surface area, due to the partial blockage of the zeolite channels by the large size ions. However, a decrease was noted for all samples due to platinum, which partially blocked the zeolite channels. Barium also decreased the crystallinity while platinum caused this effect only for calcium and barium-containing samples, due to the structure partial collapse. Metallic platinum species in several electronic states were detected in the cages of zeolite, barium-containing catalyst showing the most electron-enriched platinum atoms. The amount of Lewis and Brønsted acid sites increased due to magnesium and calcium but barium increased only the amount of Lewis acid sites, as compared to potassium-containing solid. The catalysts with magnesium and barium showed the same platinum dispersion, which was higher than the one containing calcium. All catalysts were active in n-octane reforming at 723K and selective to ethylbenzene, but the conversion dropped with time reaction due to the decrease of specific surface area and to coke deposition. The calcium-containing sample produced the hardest coke, which led to the highest drop in conversion. The n-octane conversion was supposed to occur by a monofunctional mechanism but the bifunctional mechanism also seemed to occur due to the residual acidity of the catalysts. The calcium and barium-containing catalysts were the most selective to<br />ethylbenzene, due to electron-enriched platinum species related to promoters, but the low ethylbenzene selectivity for the magnesium-containing catalyst was compensated by its high conversion, resulting in similar yields for all catalysts. Fil: Fonseca, Juliana Da Silva Lima. Universidade Federal da Bahia; Brasil Fil: Júnior, Arnaldo Da Costa Faro. Universidade Federal do Rio de Janeiro; Brasil Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina Fil: Rangel, Maria do Carmo. Universidade Federal da Bahia; Brasil |
description |
Platinum catalysts supported on zeolite KY (Si/Al = 12.7), modified with magnesium, calcium or barium, were evaluated in n-octane reforming to produce ethylbenzene. The catalysts were characterized by nitrogen adsorption, 27Al and 29Si solid state nuclear magnetic resonance, Fourier transform infrared spectroscopy using carbon monoxide or pyridine, metal dispersion measurements and programmed temperature oxidation. No significant structural change was noted for the solids due to the dopants except<br />for barium, which decreased the specific surface area, due to the partial blockage of the zeolite channels by the large size ions. However, a decrease was noted for all samples due to platinum, which partially blocked the zeolite channels. Barium also decreased the crystallinity while platinum caused this effect only for calcium and barium-containing samples, due to the structure partial collapse. Metallic platinum species in several electronic states were detected in the cages of zeolite, barium-containing catalyst showing the most electron-enriched platinum atoms. The amount of Lewis and Brønsted acid sites increased due to magnesium and calcium but barium increased only the amount of Lewis acid sites, as compared to potassium-containing solid. The catalysts with magnesium and barium showed the same platinum dispersion, which was higher than the one containing calcium. All catalysts were active in n-octane reforming at 723K and selective to ethylbenzene, but the conversion dropped with time reaction due to the decrease of specific surface area and to coke deposition. The calcium-containing sample produced the hardest coke, which led to the highest drop in conversion. The n-octane conversion was supposed to occur by a monofunctional mechanism but the bifunctional mechanism also seemed to occur due to the residual acidity of the catalysts. The calcium and barium-containing catalysts were the most selective to<br />ethylbenzene, due to electron-enriched platinum species related to promoters, but the low ethylbenzene selectivity for the magnesium-containing catalyst was compensated by its high conversion, resulting in similar yields for all catalysts. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-09 |
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/11336/54027 Fonseca, Juliana Da Silva Lima; Júnior, Arnaldo Da Costa Faro; Grau, Javier Mario; Rangel, Maria do Carmo; Ethylbenzene production over platinum catalysts supported on modified KY zeolites; Elsevier Science; Applied Catalysis A: General; 386; 9-2010; 201-210 0926-860X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/54027 |
identifier_str_mv |
Fonseca, Juliana Da Silva Lima; Júnior, Arnaldo Da Costa Faro; Grau, Javier Mario; Rangel, Maria do Carmo; Ethylbenzene production over platinum catalysts supported on modified KY zeolites; Elsevier Science; Applied Catalysis A: General; 386; 9-2010; 201-210 0926-860X CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2010.07.056 |
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 |
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1844612991117426688 |
score |
13.070432 |