Preventing self-poisoning in [Pt/Al2O3 + SO42−-ZrO2] mixed catalysts for isomerization-cracking of heavy alkanes by prereduction of the acid function

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...

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Authors: Grau, Javier Mario, Vera, Carlos Roman, Parera, Jose
Format: article
Status:Published version
Publication Date:2002
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/40203
Online Access:http://hdl.handle.net/11336/40203
Access Level:Open access
Keyword:So42−-Zro2
Pt/Al2o3
Composite Catalysts
N-Octane Hydroisomerization-Hydrocracking
Hydrogen Pretreatment
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
id AR_7b6e3da7b5e1b9364dfdb9cc8ecc2fe6
oai_identifier_str oai:ri.conicet.gov.ar:11336/40203
network_acronym_str AR
network_name_str Argentina
repository_id_str
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
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
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
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
topic So42−-Zro2
Pt/Al2o3
Composite Catalysts
N-Octane Hydroisomerization-Hydrocracking
Hydrogen Pretreatment
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
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
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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_ 1799196346301808640
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 Técnicas2024-05-08T14:24:02Zoai: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:34982024-05-08 14:24:02.603CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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