In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol

Autores
Gambaro, Luis Alberto; Briand, Laura Estefania
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly active towards isopropanol dehydration above that temperature. The number of available sites for isopropanol adsorption-reaction of Keggin and Wells-Dawson heteropoly-acids was considerably higher than bulk WO3 and monolayer supported tungsten oxide species. The temperature of surface decomposition of adsorbed isopropoxy species towards propylene was considerably lower on the heteropoly-acids rather than the other tungsten oxide based catalysts. The degree of hydration of the heteropoly-anions greatly modified the amount of accessible sites for isopropanol adsorption and further dehydration.
Fil: Gambaro, Luis Alberto. 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: Briand, Laura Estefania. 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
Materia
Adsorption
Heteropoly-Acids
Keggin
Number of Active Sites
Temperature Programmed Surface Reaction
Wells-Dawson
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/57378
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/57378
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanolGambaro, Luis AlbertoBriand, Laura EstefaniaAdsorptionHeteropoly-AcidsKegginNumber of Active SitesTemperature Programmed Surface ReactionWells-Dawsonhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly active towards isopropanol dehydration above that temperature. The number of available sites for isopropanol adsorption-reaction of Keggin and Wells-Dawson heteropoly-acids was considerably higher than bulk WO3 and monolayer supported tungsten oxide species. The temperature of surface decomposition of adsorbed isopropoxy species towards propylene was considerably lower on the heteropoly-acids rather than the other tungsten oxide based catalysts. The degree of hydration of the heteropoly-anions greatly modified the amount of accessible sites for isopropanol adsorption and further dehydration.Fil: Gambaro, Luis Alberto. 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: Briand, Laura Estefania. 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; ArgentinaElsevier Science2004-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/57378Gambaro, Luis Alberto; Briand, Laura Estefania; In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol; Elsevier Science; Applied Catalysis A: General; 264; 2; 6-2004; 131-1390926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2003.12.053info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0400033Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-05T10:20:32Zoai:ri.conicet.gov.ar:11336/57378instacron: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:34982025-11-05 10:20:32.356CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
title In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
spellingShingle In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
Gambaro, Luis Alberto
Adsorption
Heteropoly-Acids
Keggin
Number of Active Sites
Temperature Programmed Surface Reaction
Wells-Dawson
title_short In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
title_full In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
title_fullStr In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
title_full_unstemmed In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
title_sort In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
dc.creator.none.fl_str_mv Gambaro, Luis Alberto
Briand, Laura Estefania
author Gambaro, Luis Alberto
author_facet Gambaro, Luis Alberto
Briand, Laura Estefania
author_role author
author2 Briand, Laura Estefania
author2_role author
dc.subject.none.fl_str_mv Adsorption
Heteropoly-Acids
Keggin
Number of Active Sites
Temperature Programmed Surface Reaction
Wells-Dawson
topic Adsorption
Heteropoly-Acids
Keggin
Number of Active Sites
Temperature Programmed Surface Reaction
Wells-Dawson
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly active towards isopropanol dehydration above that temperature. The number of available sites for isopropanol adsorption-reaction of Keggin and Wells-Dawson heteropoly-acids was considerably higher than bulk WO3 and monolayer supported tungsten oxide species. The temperature of surface decomposition of adsorbed isopropoxy species towards propylene was considerably lower on the heteropoly-acids rather than the other tungsten oxide based catalysts. The degree of hydration of the heteropoly-anions greatly modified the amount of accessible sites for isopropanol adsorption and further dehydration.
Fil: Gambaro, Luis Alberto. 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: Briand, Laura Estefania. 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
description Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly active towards isopropanol dehydration above that temperature. The number of available sites for isopropanol adsorption-reaction of Keggin and Wells-Dawson heteropoly-acids was considerably higher than bulk WO3 and monolayer supported tungsten oxide species. The temperature of surface decomposition of adsorbed isopropoxy species towards propylene was considerably lower on the heteropoly-acids rather than the other tungsten oxide based catalysts. The degree of hydration of the heteropoly-anions greatly modified the amount of accessible sites for isopropanol adsorption and further dehydration.
publishDate 2004
dc.date.none.fl_str_mv 2004-06
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/11336/57378
Gambaro, Luis Alberto; Briand, Laura Estefania; In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol; Elsevier Science; Applied Catalysis A: General; 264; 2; 6-2004; 131-139
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/57378
identifier_str_mv Gambaro, Luis Alberto; Briand, Laura Estefania; In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol; Elsevier Science; Applied Catalysis A: General; 264; 2; 6-2004; 131-139
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.2003.12.053
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0400033X
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
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_ 1847977805242957824
score 13.121305

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