Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds

Autores
Vera, Carlos Roman; Pieck, Carlos Luis; Shimizu, Kiyoyuki; Yori, Juan Carlos; Parera, Jose
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
New Pt/SO42−-ZrO2 catalysts were prepared using precalcined SO42−-ZrO2 and organometallic Pt precursors. The objective was to obtain a bifunctional catalyst with improved metal properties, which are mostly suppressed in Pt/SO42−-ZrO2 prepared in a standard fashion. The synthesis route used low temperatures to form the Pt particles in order to avoid sulfate decomposition and Pt poisoning. The use of precalcined zirconia decreased ionic diffusion, related to crystallization of the gel and encapsulation of Pt particles. As detected by TPR and cyclohexane dehydrogenation tests, after reducing at 270 °C, Pt on the new catalyst had metallic properties. Its dehydrogenation activity was higher than that of a standard Pt/SO42−-ZrO2 catalyst (prepared from H2PtCl6). After activating in air at 300 °C, its activity for n-butane isomerization (300 °C, 1 atm., H2:n-C4=6, WHSV=1 h−1) was low, very likely because of incomplete elimination of adsorbed water. After activation in air at 600 °C, the isomerization activity was almost similar to that of standard Pt/SO42−-ZrO2 but the dehydrogenation activity decreased to negligible values. The deleterious interaction between Pt and SO42−-ZrO2 that occurred during calcination was possibly related to oxidation of the metal. On the other side, high reduction temperatures did not enhance the metal activity beyond the level obtained after reducing at 270 °C. On the contrary, the higher the reduction temperature, the lower the activity for cyclohexane dehydrogenation that was obtained. This effect was seemingly related to poisoning by sulfur compounds. The new materials could be potentially useful for reacting systems needing a bifunctional catalyst and an acid function like SO42−-ZrO2 but their operation is limited if high temperatures in air or H2 are necessary for activation.
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: Pieck, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Shimizu, Kiyoyuki. National Institute for Advanced Industrial Science and Technology (AIST); Japón
Fil: Yori, Juan Carlos. 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
Organometal
Pt/So42−-Zro2 Catalytic Activity
Activation
Sulfur Poisoning
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:11336/40096
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/40096
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compoundsVera, Carlos RomanPieck, Carlos LuisShimizu, KiyoyukiYori, Juan CarlosParera, JoseOrganometalPt/So42−-Zro2 Catalytic ActivityActivationSulfur Poisoninghttps://purl.org/becyt/ford/2.7https://purl.org/becyt/ford/2New Pt/SO42−-ZrO2 catalysts were prepared using precalcined SO42−-ZrO2 and organometallic Pt precursors. The objective was to obtain a bifunctional catalyst with improved metal properties, which are mostly suppressed in Pt/SO42−-ZrO2 prepared in a standard fashion. The synthesis route used low temperatures to form the Pt particles in order to avoid sulfate decomposition and Pt poisoning. The use of precalcined zirconia decreased ionic diffusion, related to crystallization of the gel and encapsulation of Pt particles. As detected by TPR and cyclohexane dehydrogenation tests, after reducing at 270 °C, Pt on the new catalyst had metallic properties. Its dehydrogenation activity was higher than that of a standard Pt/SO42−-ZrO2 catalyst (prepared from H2PtCl6). After activating in air at 300 °C, its activity for n-butane isomerization (300 °C, 1 atm., H2:n-C4=6, WHSV=1 h−1) was low, very likely because of incomplete elimination of adsorbed water. After activation in air at 600 °C, the isomerization activity was almost similar to that of standard Pt/SO42−-ZrO2 but the dehydrogenation activity decreased to negligible values. The deleterious interaction between Pt and SO42−-ZrO2 that occurred during calcination was possibly related to oxidation of the metal. On the other side, high reduction temperatures did not enhance the metal activity beyond the level obtained after reducing at 270 °C. On the contrary, the higher the reduction temperature, the lower the activity for cyclohexane dehydrogenation that was obtained. This effect was seemingly related to poisoning by sulfur compounds. The new materials could be potentially useful for reacting systems needing a bifunctional catalyst and an acid function like SO42−-ZrO2 but their operation is limited if high temperatures in air or H2 are necessary for activation.Fil: Vera, Carlos Roman. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Pieck, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Shimizu, Kiyoyuki. National Institute for Advanced Industrial Science and Technology (AIST); JapónFil: Yori, Juan Carlos. 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 Science2002-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/40096Vera, Carlos Roman; Pieck, Carlos Luis; Shimizu, Kiyoyuki; Yori, Juan Carlos; Parera, Jose; Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds; Elsevier Science; Applied Catalysis A: General; 232; 1-2; 6-2002; 169-1800926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-860X(02)00093-5info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X02000935info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:42:16Zoai:ri.conicet.gov.ar:11336/40096instacron: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:34982025-10-22 11:42:16.432CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
title Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
spellingShingle Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
Vera, Carlos Roman
Organometal
Pt/So42−-Zro2 Catalytic Activity
Activation
Sulfur Poisoning
title_short Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
title_full Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
title_fullStr Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
title_full_unstemmed Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
title_sort Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds
dc.creator.none.fl_str_mv Vera, Carlos Roman
Pieck, Carlos Luis
Shimizu, Kiyoyuki
Yori, Juan Carlos
Parera, Jose
author Vera, Carlos Roman
author_facet Vera, Carlos Roman
Pieck, Carlos Luis
Shimizu, Kiyoyuki
Yori, Juan Carlos
Parera, Jose
author_role author
author2 Pieck, Carlos Luis
Shimizu, Kiyoyuki
Yori, Juan Carlos
Parera, Jose
author2_role author
author
author
author
dc.subject.none.fl_str_mv Organometal
Pt/So42−-Zro2 Catalytic Activity
Activation
Sulfur Poisoning
topic Organometal
Pt/So42−-Zro2 Catalytic Activity
Activation
Sulfur Poisoning
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.7
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv New Pt/SO42−-ZrO2 catalysts were prepared using precalcined SO42−-ZrO2 and organometallic Pt precursors. The objective was to obtain a bifunctional catalyst with improved metal properties, which are mostly suppressed in Pt/SO42−-ZrO2 prepared in a standard fashion. The synthesis route used low temperatures to form the Pt particles in order to avoid sulfate decomposition and Pt poisoning. The use of precalcined zirconia decreased ionic diffusion, related to crystallization of the gel and encapsulation of Pt particles. As detected by TPR and cyclohexane dehydrogenation tests, after reducing at 270 °C, Pt on the new catalyst had metallic properties. Its dehydrogenation activity was higher than that of a standard Pt/SO42−-ZrO2 catalyst (prepared from H2PtCl6). After activating in air at 300 °C, its activity for n-butane isomerization (300 °C, 1 atm., H2:n-C4=6, WHSV=1 h−1) was low, very likely because of incomplete elimination of adsorbed water. After activation in air at 600 °C, the isomerization activity was almost similar to that of standard Pt/SO42−-ZrO2 but the dehydrogenation activity decreased to negligible values. The deleterious interaction between Pt and SO42−-ZrO2 that occurred during calcination was possibly related to oxidation of the metal. On the other side, high reduction temperatures did not enhance the metal activity beyond the level obtained after reducing at 270 °C. On the contrary, the higher the reduction temperature, the lower the activity for cyclohexane dehydrogenation that was obtained. This effect was seemingly related to poisoning by sulfur compounds. The new materials could be potentially useful for reacting systems needing a bifunctional catalyst and an acid function like SO42−-ZrO2 but their operation is limited if high temperatures in air or H2 are necessary for activation.
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: Pieck, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Shimizu, Kiyoyuki. National Institute for Advanced Industrial Science and Technology (AIST); Japón
Fil: Yori, Juan Carlos. 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 New Pt/SO42−-ZrO2 catalysts were prepared using precalcined SO42−-ZrO2 and organometallic Pt precursors. The objective was to obtain a bifunctional catalyst with improved metal properties, which are mostly suppressed in Pt/SO42−-ZrO2 prepared in a standard fashion. The synthesis route used low temperatures to form the Pt particles in order to avoid sulfate decomposition and Pt poisoning. The use of precalcined zirconia decreased ionic diffusion, related to crystallization of the gel and encapsulation of Pt particles. As detected by TPR and cyclohexane dehydrogenation tests, after reducing at 270 °C, Pt on the new catalyst had metallic properties. Its dehydrogenation activity was higher than that of a standard Pt/SO42−-ZrO2 catalyst (prepared from H2PtCl6). After activating in air at 300 °C, its activity for n-butane isomerization (300 °C, 1 atm., H2:n-C4=6, WHSV=1 h−1) was low, very likely because of incomplete elimination of adsorbed water. After activation in air at 600 °C, the isomerization activity was almost similar to that of standard Pt/SO42−-ZrO2 but the dehydrogenation activity decreased to negligible values. The deleterious interaction between Pt and SO42−-ZrO2 that occurred during calcination was possibly related to oxidation of the metal. On the other side, high reduction temperatures did not enhance the metal activity beyond the level obtained after reducing at 270 °C. On the contrary, the higher the reduction temperature, the lower the activity for cyclohexane dehydrogenation that was obtained. This effect was seemingly related to poisoning by sulfur compounds. The new materials could be potentially useful for reacting systems needing a bifunctional catalyst and an acid function like SO42−-ZrO2 but their operation is limited if high temperatures in air or H2 are necessary for activation.
publishDate 2002
dc.date.none.fl_str_mv 2002-06
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/11336/40096
Vera, Carlos Roman; Pieck, Carlos Luis; Shimizu, Kiyoyuki; Yori, Juan Carlos; Parera, Jose; Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds; Elsevier Science; Applied Catalysis A: General; 232; 1-2; 6-2002; 169-180
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/40096
identifier_str_mv Vera, Carlos Roman; Pieck, Carlos Luis; Shimizu, Kiyoyuki; Yori, Juan Carlos; Parera, Jose; Pt/SO42−-ZrO2 catalysts prepared from Pt organometallic compounds; Elsevier Science; Applied Catalysis A: General; 232; 1-2; 6-2002; 169-180
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/S0926-860X(02)00093-5
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X02000935
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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score 12.982451

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