Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature

Autores
Cuesta Zapata, Pablo Martín; Parentis, Monica Liliana; Gonzo, Elio Emilio; Bonini, Norberto Alejandro
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Cr/SiO2 catalysts (4-8% Cr, w/w), obtained from Cr(III) salts and tetraethylortosilicate (TEOS), were prepared by the sol-gel method. After TEOS hydrolysis in ammoniacal solution (pH: 9.5), the gel was treated under hydrothermal conditions at 120-220 C. The solids were characterized by N 2 sorptometry, TG-DTA, DRUV-vis, XRD, and FTIR. In vacuum or N 2 atmosphere, Cr3+ ions were stable up to 450 C. However, calcination in air promotes the partial oxidation of Cr3+ to Cr 6+ as the temperature increases from 200 to 450 C. The amount of Cr6+ formed depends on the temperature of the hydrothermal treatment. 2,6-Lutidine adsorption allows to determine the evolution, with respect to calcination temperature, of both Lewis and Brönsted acid centers. Cr 3+ ions were related to the presence of Lewis sites, and Cr 6+ ions to the development of weak Brönsted acid sites. Accordingly, the 2-propanol dehydration reaction rate shows an increase when the catalysts are treated in N2 at 450 C, while catalysts calcined in air develop a lower acidity. The dehydration reaction is attributed to the presence of Lewis acid centers.
Fil: Cuesta Zapata, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Parentis, Monica Liliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Gonzo, Elio Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Bonini, Norberto Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Materia
Cr/Sio2
Sol-Gel
2,6-Lutidine
Druv-Vis
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:11336/84140
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/84140
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperatureCuesta Zapata, Pablo MartínParentis, Monica LilianaGonzo, Elio EmilioBonini, Norberto AlejandroCr/Sio2Sol-Gel2,6-LutidineDruv-Vishttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2https://purl.org/becyt/ford/2.10https://purl.org/becyt/ford/2Cr/SiO2 catalysts (4-8% Cr, w/w), obtained from Cr(III) salts and tetraethylortosilicate (TEOS), were prepared by the sol-gel method. After TEOS hydrolysis in ammoniacal solution (pH: 9.5), the gel was treated under hydrothermal conditions at 120-220 C. The solids were characterized by N 2 sorptometry, TG-DTA, DRUV-vis, XRD, and FTIR. In vacuum or N 2 atmosphere, Cr3+ ions were stable up to 450 C. However, calcination in air promotes the partial oxidation of Cr3+ to Cr 6+ as the temperature increases from 200 to 450 C. The amount of Cr6+ formed depends on the temperature of the hydrothermal treatment. 2,6-Lutidine adsorption allows to determine the evolution, with respect to calcination temperature, of both Lewis and Brönsted acid centers. Cr 3+ ions were related to the presence of Lewis sites, and Cr 6+ ions to the development of weak Brönsted acid sites. Accordingly, the 2-propanol dehydration reaction rate shows an increase when the catalysts are treated in N2 at 450 C, while catalysts calcined in air develop a lower acidity. The dehydration reaction is attributed to the presence of Lewis acid centers.Fil: Cuesta Zapata, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaFil: Parentis, Monica Liliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaFil: Gonzo, Elio Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaFil: Bonini, Norberto Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaElsevier Science2013-04-24info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/84140Cuesta Zapata, Pablo Martín; Parentis, Monica Liliana; Gonzo, Elio Emilio; Bonini, Norberto Alejandro; Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature; Elsevier Science; Applied Catalysis A: General; 457; 24-4-2013; 26-330926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2013.02.028info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X13001191info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:51:56Zoai:ri.conicet.gov.ar:11336/84140instacron: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 09:51:56.865CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
title Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
spellingShingle Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
Cuesta Zapata, Pablo Martín
Cr/Sio2
Sol-Gel
2,6-Lutidine
Druv-Vis
title_short Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
title_full Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
title_fullStr Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
title_full_unstemmed Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
title_sort Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature
dc.creator.none.fl_str_mv Cuesta Zapata, Pablo Martín
Parentis, Monica Liliana
Gonzo, Elio Emilio
Bonini, Norberto Alejandro
author Cuesta Zapata, Pablo Martín
author_facet Cuesta Zapata, Pablo Martín
Parentis, Monica Liliana
Gonzo, Elio Emilio
Bonini, Norberto Alejandro
author_role author
author2 Parentis, Monica Liliana
Gonzo, Elio Emilio
Bonini, Norberto Alejandro
author2_role author
author
author
dc.subject.none.fl_str_mv Cr/Sio2
Sol-Gel
2,6-Lutidine
Druv-Vis
topic Cr/Sio2
Sol-Gel
2,6-Lutidine
Druv-Vis
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
https://purl.org/becyt/ford/2.10
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Cr/SiO2 catalysts (4-8% Cr, w/w), obtained from Cr(III) salts and tetraethylortosilicate (TEOS), were prepared by the sol-gel method. After TEOS hydrolysis in ammoniacal solution (pH: 9.5), the gel was treated under hydrothermal conditions at 120-220 C. The solids were characterized by N 2 sorptometry, TG-DTA, DRUV-vis, XRD, and FTIR. In vacuum or N 2 atmosphere, Cr3+ ions were stable up to 450 C. However, calcination in air promotes the partial oxidation of Cr3+ to Cr 6+ as the temperature increases from 200 to 450 C. The amount of Cr6+ formed depends on the temperature of the hydrothermal treatment. 2,6-Lutidine adsorption allows to determine the evolution, with respect to calcination temperature, of both Lewis and Brönsted acid centers. Cr 3+ ions were related to the presence of Lewis sites, and Cr 6+ ions to the development of weak Brönsted acid sites. Accordingly, the 2-propanol dehydration reaction rate shows an increase when the catalysts are treated in N2 at 450 C, while catalysts calcined in air develop a lower acidity. The dehydration reaction is attributed to the presence of Lewis acid centers.
Fil: Cuesta Zapata, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Parentis, Monica Liliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Gonzo, Elio Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
Fil: Bonini, Norberto Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; Argentina
description Cr/SiO2 catalysts (4-8% Cr, w/w), obtained from Cr(III) salts and tetraethylortosilicate (TEOS), were prepared by the sol-gel method. After TEOS hydrolysis in ammoniacal solution (pH: 9.5), the gel was treated under hydrothermal conditions at 120-220 C. The solids were characterized by N 2 sorptometry, TG-DTA, DRUV-vis, XRD, and FTIR. In vacuum or N 2 atmosphere, Cr3+ ions were stable up to 450 C. However, calcination in air promotes the partial oxidation of Cr3+ to Cr 6+ as the temperature increases from 200 to 450 C. The amount of Cr6+ formed depends on the temperature of the hydrothermal treatment. 2,6-Lutidine adsorption allows to determine the evolution, with respect to calcination temperature, of both Lewis and Brönsted acid centers. Cr 3+ ions were related to the presence of Lewis sites, and Cr 6+ ions to the development of weak Brönsted acid sites. Accordingly, the 2-propanol dehydration reaction rate shows an increase when the catalysts are treated in N2 at 450 C, while catalysts calcined in air develop a lower acidity. The dehydration reaction is attributed to the presence of Lewis acid centers.
publishDate 2013
dc.date.none.fl_str_mv 2013-04-24
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/11336/84140
Cuesta Zapata, Pablo Martín; Parentis, Monica Liliana; Gonzo, Elio Emilio; Bonini, Norberto Alejandro; Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature; Elsevier Science; Applied Catalysis A: General; 457; 24-4-2013; 26-33
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/84140
identifier_str_mv Cuesta Zapata, Pablo Martín; Parentis, Monica Liliana; Gonzo, Elio Emilio; Bonini, Norberto Alejandro; Acid sites development on Cr3+/SiO2 catalysts obtained by the sol-gel method and hydrothermal treatment: Effect of calcination temperature; Elsevier Science; Applied Catalysis A: General; 457; 24-4-2013; 26-33
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.2013.02.028
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X13001191
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
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 13.070432

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