Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function
- Autores
- Grau, Javier Mario; Vera, Carlos Roman; Parera, Jose
- Año de publicación
- 2002
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The activity and stability of composite catalysts obtained by mixing Pt/Al2O3 with SO42−-ZrO2, were studied in the reaction of hydroisomerization-cracking of n-octane (300 °C, 1.5 MPa, WHSV=4 h−1, H2/n-C8=6) obtaining light isoalkanes (isobutane, isopentane, isohexane), very important components of the pool of reformulated gasoline. Both components of the composites were pretreated in H2 before mixing. Prereduction eliminated the fraction of SO42− reducible at low temperature, thought to produce SO2 during reaction, a poison for the metal function. A reduction in the poisoning of the metal, produced by adsorption of S compounds, was tried in order to get a higher metal activity for the production of atomic H, needed for the hydrogenation of coke precursors and the prevention of deactivation. The pretreatment temperature was adjusted between 300 and 500 °C in order to keep a suitable amount of sulfate, needed for a sustainable isomerizing-cracking activity and for the stabilization of the tetragonal crystal phase of ZrO2, the most catalytically active crystal phase. When compared to non-reduced catalysts, composites reduced at 300–350 °C displayed improved activity and stability for benzene hydrogenation, a metal-catalyzed reaction, and the results were addressed to a decrease in S poisoning. In the pretreated composites the SO42−-ZrO2 active tetragonal phase was maintained in spite of the loss of S. For isomerization-cracking of n-octane, the pretreated catalysts showed a higher selectivity to isobutane and a fairly longer stability than non-pretreated catalysts, like Pt/SO42−-ZrO2 and SO42−-ZrO2 mixed with Pt/Al. TPO tests showed that the catalysts were essentially free of coke. This fact was addressed to a lower coking rate on prereduced sites and to a higher metal activity for hydrogenation of coke precursors.
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: Vera, Carlos Roman. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Parera, Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina - Materia
-
So42−-Zro2
Pt/Al2o3
Composite Catalysts
N-Octane Hydroisomerization-Hydrocracking
Hydrogen Pretreatment - 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:11336/40203
Ver los metadatos del registro completo
id |
CONICETDig_7b6e3da7b5e1b9364dfdb9cc8ecc2fe6 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/40203 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid functionGrau, Javier MarioVera, Carlos RomanParera, JoseSo42−-Zro2Pt/Al2o3Composite CatalystsN-Octane Hydroisomerization-HydrocrackingHydrogen Pretreatmenthttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The activity and stability of composite catalysts obtained by mixing Pt/Al2O3 with SO42−-ZrO2, were studied in the reaction of hydroisomerization-cracking of n-octane (300 °C, 1.5 MPa, WHSV=4 h−1, H2/n-C8=6) obtaining light isoalkanes (isobutane, isopentane, isohexane), very important components of the pool of reformulated gasoline. Both components of the composites were pretreated in H2 before mixing. Prereduction eliminated the fraction of SO42− reducible at low temperature, thought to produce SO2 during reaction, a poison for the metal function. A reduction in the poisoning of the metal, produced by adsorption of S compounds, was tried in order to get a higher metal activity for the production of atomic H, needed for the hydrogenation of coke precursors and the prevention of deactivation. The pretreatment temperature was adjusted between 300 and 500 °C in order to keep a suitable amount of sulfate, needed for a sustainable isomerizing-cracking activity and for the stabilization of the tetragonal crystal phase of ZrO2, the most catalytically active crystal phase. When compared to non-reduced catalysts, composites reduced at 300–350 °C displayed improved activity and stability for benzene hydrogenation, a metal-catalyzed reaction, and the results were addressed to a decrease in S poisoning. In the pretreated composites the SO42−-ZrO2 active tetragonal phase was maintained in spite of the loss of S. For isomerization-cracking of n-octane, the pretreated catalysts showed a higher selectivity to isobutane and a fairly longer stability than non-pretreated catalysts, like Pt/SO42−-ZrO2 and SO42−-ZrO2 mixed with Pt/Al. TPO tests showed that the catalysts were essentially free of coke. This fact was addressed to a lower coking rate on prereduced sites and to a higher metal activity for hydrogenation of coke precursors.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"; ArgentinaFil: Vera, Carlos Roman. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Parera, Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaElsevier Science2002-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/40203Grau, Javier Mario; Vera, Carlos Roman; Parera, Jose; Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function; Elsevier Science; Applied Catalysis A: General; 227; 1-2; 3-2002; 217-2300926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X01009401info:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-860X(01)00940-1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:41:27Zoai:ri.conicet.gov.ar:11336/40203instacron: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 10:41:27.421CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
title |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
spellingShingle |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function Grau, Javier Mario So42−-Zro2 Pt/Al2o3 Composite Catalysts N-Octane Hydroisomerization-Hydrocracking Hydrogen Pretreatment |
title_short |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
title_full |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
title_fullStr |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
title_full_unstemmed |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
title_sort |
Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function |
dc.creator.none.fl_str_mv |
Grau, Javier Mario Vera, Carlos Roman Parera, Jose |
author |
Grau, Javier Mario |
author_facet |
Grau, Javier Mario Vera, Carlos Roman Parera, Jose |
author_role |
author |
author2 |
Vera, Carlos Roman Parera, Jose |
author2_role |
author author |
dc.subject.none.fl_str_mv |
So42−-Zro2 Pt/Al2o3 Composite Catalysts N-Octane Hydroisomerization-Hydrocracking Hydrogen Pretreatment |
topic |
So42−-Zro2 Pt/Al2o3 Composite Catalysts N-Octane Hydroisomerization-Hydrocracking Hydrogen Pretreatment |
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 activity and stability of composite catalysts obtained by mixing Pt/Al2O3 with SO42−-ZrO2, were studied in the reaction of hydroisomerization-cracking of n-octane (300 °C, 1.5 MPa, WHSV=4 h−1, H2/n-C8=6) obtaining light isoalkanes (isobutane, isopentane, isohexane), very important components of the pool of reformulated gasoline. Both components of the composites were pretreated in H2 before mixing. Prereduction eliminated the fraction of SO42− reducible at low temperature, thought to produce SO2 during reaction, a poison for the metal function. A reduction in the poisoning of the metal, produced by adsorption of S compounds, was tried in order to get a higher metal activity for the production of atomic H, needed for the hydrogenation of coke precursors and the prevention of deactivation. The pretreatment temperature was adjusted between 300 and 500 °C in order to keep a suitable amount of sulfate, needed for a sustainable isomerizing-cracking activity and for the stabilization of the tetragonal crystal phase of ZrO2, the most catalytically active crystal phase. When compared to non-reduced catalysts, composites reduced at 300–350 °C displayed improved activity and stability for benzene hydrogenation, a metal-catalyzed reaction, and the results were addressed to a decrease in S poisoning. In the pretreated composites the SO42−-ZrO2 active tetragonal phase was maintained in spite of the loss of S. For isomerization-cracking of n-octane, the pretreated catalysts showed a higher selectivity to isobutane and a fairly longer stability than non-pretreated catalysts, like Pt/SO42−-ZrO2 and SO42−-ZrO2 mixed with Pt/Al. TPO tests showed that the catalysts were essentially free of coke. This fact was addressed to a lower coking rate on prereduced sites and to a higher metal activity for hydrogenation of coke precursors. 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: Vera, Carlos Roman. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina Fil: Parera, Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina |
description |
The activity and stability of composite catalysts obtained by mixing Pt/Al2O3 with SO42−-ZrO2, were studied in the reaction of hydroisomerization-cracking of n-octane (300 °C, 1.5 MPa, WHSV=4 h−1, H2/n-C8=6) obtaining light isoalkanes (isobutane, isopentane, isohexane), very important components of the pool of reformulated gasoline. Both components of the composites were pretreated in H2 before mixing. Prereduction eliminated the fraction of SO42− reducible at low temperature, thought to produce SO2 during reaction, a poison for the metal function. A reduction in the poisoning of the metal, produced by adsorption of S compounds, was tried in order to get a higher metal activity for the production of atomic H, needed for the hydrogenation of coke precursors and the prevention of deactivation. The pretreatment temperature was adjusted between 300 and 500 °C in order to keep a suitable amount of sulfate, needed for a sustainable isomerizing-cracking activity and for the stabilization of the tetragonal crystal phase of ZrO2, the most catalytically active crystal phase. When compared to non-reduced catalysts, composites reduced at 300–350 °C displayed improved activity and stability for benzene hydrogenation, a metal-catalyzed reaction, and the results were addressed to a decrease in S poisoning. In the pretreated composites the SO42−-ZrO2 active tetragonal phase was maintained in spite of the loss of S. For isomerization-cracking of n-octane, the pretreated catalysts showed a higher selectivity to isobutane and a fairly longer stability than non-pretreated catalysts, like Pt/SO42−-ZrO2 and SO42−-ZrO2 mixed with Pt/Al. TPO tests showed that the catalysts were essentially free of coke. This fact was addressed to a lower coking rate on prereduced sites and to a higher metal activity for hydrogenation of coke precursors. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-03 |
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/11336/40203 Grau, Javier Mario; Vera, Carlos Roman; Parera, Jose; Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function; Elsevier Science; Applied Catalysis A: General; 227; 1-2; 3-2002; 217-230 0926-860X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/40203 |
identifier_str_mv |
Grau, Javier Mario; Vera, Carlos Roman; Parera, Jose; Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function; Elsevier Science; Applied Catalysis A: General; 227; 1-2; 3-2002; 217-230 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/url/https://www.sciencedirect.com/science/article/pii/S0926860X01009401 info:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-860X(01)00940-1 |
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_ |
1844614445088636928 |
score |
13.070432 |