Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts

Autores
Chimienti, Marcelo E.; Pizzio, Luis Rene; Caceres, Carmen Victoria; Blanco, Mirta Noemi
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Tungstophosphoric (TPA) and tungstosilicic acid (TSA) catalysts supported on carbon were studied. They were prepared by equilibrium and incipient wetness impregnation techniques. Solutions of TPA and TSA in 50% v/v ethanol-water were used to impregnate carbon at 20 °C. The Fourier transform infrared and 31P nuclear magnetic resonance spectroscopies of TPA and TSA supported catalysts dried at 70 °C showed that the species present were the undegraded [PW12O40]3- and [SiW12O40]4- anion, respectively. X-ray diffraction of the impregnated solids showed the same diffraction patterns as the supports, possibly owing to a high dispersion of non-crystalline species. The scanning electron microscopy with energy dispersive X-ray analysis of the supported acids showed a uniform distribution of TPA and TSA in the carbon particles with low heteropolyacid content. In the samples with high content or prepared by incipient wetness method small grains of TPA and TSA were found. These grains showed to be nearly inactive for isopropanol dehydration. The specific conversion of the catalysts for this reaction increases regularly with the increase of the adsorbed heteropolyacid content.
Fil: Chimienti, Marcelo E.. 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: Pizzio, Luis Rene. 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: Caceres, Carmen Victoria. 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: Blanco, Mirta Noemi. 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
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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:11336/61584
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/61584
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Tungstophosphoric and tungstosilicic acids on carbon as acidic catalystsChimienti, Marcelo E.Pizzio, Luis ReneCaceres, Carmen VictoriaBlanco, Mirta Noemihttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Tungstophosphoric (TPA) and tungstosilicic acid (TSA) catalysts supported on carbon were studied. They were prepared by equilibrium and incipient wetness impregnation techniques. Solutions of TPA and TSA in 50% v/v ethanol-water were used to impregnate carbon at 20 °C. The Fourier transform infrared and 31P nuclear magnetic resonance spectroscopies of TPA and TSA supported catalysts dried at 70 °C showed that the species present were the undegraded [PW12O40]3- and [SiW12O40]4- anion, respectively. X-ray diffraction of the impregnated solids showed the same diffraction patterns as the supports, possibly owing to a high dispersion of non-crystalline species. The scanning electron microscopy with energy dispersive X-ray analysis of the supported acids showed a uniform distribution of TPA and TSA in the carbon particles with low heteropolyacid content. In the samples with high content or prepared by incipient wetness method small grains of TPA and TSA were found. These grains showed to be nearly inactive for isopropanol dehydration. The specific conversion of the catalysts for this reaction increases regularly with the increase of the adsorbed heteropolyacid content.Fil: Chimienti, Marcelo E.. 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: Pizzio, Luis Rene. 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: Caceres, Carmen Victoria. 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: Blanco, Mirta Noemi. 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 Science2001-02info: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/11336/61584Chimienti, Marcelo E.; Pizzio, Luis Rene; Caceres, Carmen Victoria; Blanco, Mirta Noemi; Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts; Elsevier Science; Applied Catalysis A: General; 208; 1-2; 2-2001; 7-190926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-860X(00)00702-Xinfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0000702Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:45:37Zoai:ri.conicet.gov.ar:11336/61584instacron: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:34982025-10-15 14:45:37.748CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
title Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
spellingShingle Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
Chimienti, Marcelo E.
title_short Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
title_full Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
title_fullStr Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
title_full_unstemmed Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
title_sort Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts
dc.creator.none.fl_str_mv Chimienti, Marcelo E.
Pizzio, Luis Rene
Caceres, Carmen Victoria
Blanco, Mirta Noemi
author Chimienti, Marcelo E.
author_facet Chimienti, Marcelo E.
Pizzio, Luis Rene
Caceres, Carmen Victoria
Blanco, Mirta Noemi
author_role author
author2 Pizzio, Luis Rene
Caceres, Carmen Victoria
Blanco, Mirta Noemi
author2_role author
author
author
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Tungstophosphoric (TPA) and tungstosilicic acid (TSA) catalysts supported on carbon were studied. They were prepared by equilibrium and incipient wetness impregnation techniques. Solutions of TPA and TSA in 50% v/v ethanol-water were used to impregnate carbon at 20 °C. The Fourier transform infrared and 31P nuclear magnetic resonance spectroscopies of TPA and TSA supported catalysts dried at 70 °C showed that the species present were the undegraded [PW12O40]3- and [SiW12O40]4- anion, respectively. X-ray diffraction of the impregnated solids showed the same diffraction patterns as the supports, possibly owing to a high dispersion of non-crystalline species. The scanning electron microscopy with energy dispersive X-ray analysis of the supported acids showed a uniform distribution of TPA and TSA in the carbon particles with low heteropolyacid content. In the samples with high content or prepared by incipient wetness method small grains of TPA and TSA were found. These grains showed to be nearly inactive for isopropanol dehydration. The specific conversion of the catalysts for this reaction increases regularly with the increase of the adsorbed heteropolyacid content.
Fil: Chimienti, Marcelo E.. 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: Pizzio, Luis Rene. 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: Caceres, Carmen Victoria. 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: Blanco, Mirta Noemi. 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 Tungstophosphoric (TPA) and tungstosilicic acid (TSA) catalysts supported on carbon were studied. They were prepared by equilibrium and incipient wetness impregnation techniques. Solutions of TPA and TSA in 50% v/v ethanol-water were used to impregnate carbon at 20 °C. The Fourier transform infrared and 31P nuclear magnetic resonance spectroscopies of TPA and TSA supported catalysts dried at 70 °C showed that the species present were the undegraded [PW12O40]3- and [SiW12O40]4- anion, respectively. X-ray diffraction of the impregnated solids showed the same diffraction patterns as the supports, possibly owing to a high dispersion of non-crystalline species. The scanning electron microscopy with energy dispersive X-ray analysis of the supported acids showed a uniform distribution of TPA and TSA in the carbon particles with low heteropolyacid content. In the samples with high content or prepared by incipient wetness method small grains of TPA and TSA were found. These grains showed to be nearly inactive for isopropanol dehydration. The specific conversion of the catalysts for this reaction increases regularly with the increase of the adsorbed heteropolyacid content.
publishDate 2001
dc.date.none.fl_str_mv 2001-02
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/11336/61584
Chimienti, Marcelo E.; Pizzio, Luis Rene; Caceres, Carmen Victoria; Blanco, Mirta Noemi; Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts; Elsevier Science; Applied Catalysis A: General; 208; 1-2; 2-2001; 7-19
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/61584
identifier_str_mv Chimienti, Marcelo E.; Pizzio, Luis Rene; Caceres, Carmen Victoria; Blanco, Mirta Noemi; Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts; Elsevier Science; Applied Catalysis A: General; 208; 1-2; 2-2001; 7-19
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(00)00702-X
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0000702X
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
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 13.22299

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