Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation

Autores
Marchesini, Fernanda Albana; Irusta, S.; Querini, Carlos Alberto; Miro, Eduardo Ernesto
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Bimetallic Pt-In and Pd-In catalysts supported on alumina or silica were studied for the reduction of nitrate to N2 in water, using H2 as reducing agent. Characterization results indicate that bimetallic particles with the surface enriched in indium, metallic crystals of Pt or Pd, and oxides of Pt or Pd and In2O3 are the main surface species present in the catalysts. Several catalysts studied in this work could fulfill the requirements usually established as limit values: 50 ppm of-NO3-, 0.1 ppm of NO2- and 0.5 ppm of NH4+. The reaction rate is strongly influenced by either the Pt:In or the Pd:In ratio, the optimum being observed at low contents of In. Of all the catalysts studied in this work, Pd(1 wt.%)In(0.25 wt.%)/Al2O3 is the most active one, but unfortunately, it presents an undesirable high selectivity towards ammonia when nitrate conversion reaches 100%. Pt(1.0%)In(0.25%)/Al2O3 presents a high initial activity but it fastly deactivates during reaction. In general, Pd-In catalysts are more active for nitrate conversion than Pt-In, and alumina is a better support than silica. The composition of the catalysts changes both after reduction and after contacting the liquid reaction media. These changes have been observed by XPS and TEM. In general, the samples used in the reaction have lower dispersion of metallic phases than the fresh-calcined ones. For most of the catalysts used in this work, the Pt:In or Pd:In surface ratio is lower than the bulk ones, this probably being the reason for the low amount of In that is sufficient to have an optimal performance for nitrate conversion.
Fil: Marchesini, Fernanda Albana. 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"; Argentina
Fil: Irusta, S.. Universidad de Zaragoza; España
Fil: Querini, Carlos Alberto. 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"; Argentina
Fil: Miro, Eduardo Ernesto. 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"; Argentina
Materia
Bimetallic Catalysts
Catalytic Reduction
Nitrates
Nitrites
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:11336/65153
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/65153
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenationMarchesini, Fernanda AlbanaIrusta, S.Querini, Carlos AlbertoMiro, Eduardo ErnestoBimetallic CatalystsCatalytic ReductionNitratesNitriteshttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Bimetallic Pt-In and Pd-In catalysts supported on alumina or silica were studied for the reduction of nitrate to N2 in water, using H2 as reducing agent. Characterization results indicate that bimetallic particles with the surface enriched in indium, metallic crystals of Pt or Pd, and oxides of Pt or Pd and In2O3 are the main surface species present in the catalysts. Several catalysts studied in this work could fulfill the requirements usually established as limit values: 50 ppm of-NO3-, 0.1 ppm of NO2- and 0.5 ppm of NH4+. The reaction rate is strongly influenced by either the Pt:In or the Pd:In ratio, the optimum being observed at low contents of In. Of all the catalysts studied in this work, Pd(1 wt.%)In(0.25 wt.%)/Al2O3 is the most active one, but unfortunately, it presents an undesirable high selectivity towards ammonia when nitrate conversion reaches 100%. Pt(1.0%)In(0.25%)/Al2O3 presents a high initial activity but it fastly deactivates during reaction. In general, Pd-In catalysts are more active for nitrate conversion than Pt-In, and alumina is a better support than silica. The composition of the catalysts changes both after reduction and after contacting the liquid reaction media. These changes have been observed by XPS and TEM. In general, the samples used in the reaction have lower dispersion of metallic phases than the fresh-calcined ones. For most of the catalysts used in this work, the Pt:In or Pd:In surface ratio is lower than the bulk ones, this probably being the reason for the low amount of In that is sufficient to have an optimal performance for nitrate conversion.Fil: Marchesini, Fernanda Albana. 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: Irusta, S.. Universidad de Zaragoza; EspañaFil: Querini, Carlos Alberto. 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: Miro, Eduardo Ernesto. 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"; ArgentinaElsevier Science2008-09info: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/11336/65153Marchesini, Fernanda Albana; Irusta, S.; Querini, Carlos Alberto; Miro, Eduardo Ernesto; Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation; Elsevier Science; Applied Catalysis A: General; 348; 1; 9-2008; 60-700926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2008.06.026info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:58:02Zoai:ri.conicet.gov.ar:11336/65153instacron: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:34982025-09-03 09:58:02.43CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
title Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
spellingShingle Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
Marchesini, Fernanda Albana
Bimetallic Catalysts
Catalytic Reduction
Nitrates
Nitrites
title_short Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
title_full Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
title_fullStr Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
title_full_unstemmed Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
title_sort Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation
dc.creator.none.fl_str_mv Marchesini, Fernanda Albana
Irusta, S.
Querini, Carlos Alberto
Miro, Eduardo Ernesto
author Marchesini, Fernanda Albana
author_facet Marchesini, Fernanda Albana
Irusta, S.
Querini, Carlos Alberto
Miro, Eduardo Ernesto
author_role author
author2 Irusta, S.
Querini, Carlos Alberto
Miro, Eduardo Ernesto
author2_role author
author
author
dc.subject.none.fl_str_mv Bimetallic Catalysts
Catalytic Reduction
Nitrates
Nitrites
topic Bimetallic Catalysts
Catalytic Reduction
Nitrates
Nitrites
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Bimetallic Pt-In and Pd-In catalysts supported on alumina or silica were studied for the reduction of nitrate to N2 in water, using H2 as reducing agent. Characterization results indicate that bimetallic particles with the surface enriched in indium, metallic crystals of Pt or Pd, and oxides of Pt or Pd and In2O3 are the main surface species present in the catalysts. Several catalysts studied in this work could fulfill the requirements usually established as limit values: 50 ppm of-NO3-, 0.1 ppm of NO2- and 0.5 ppm of NH4+. The reaction rate is strongly influenced by either the Pt:In or the Pd:In ratio, the optimum being observed at low contents of In. Of all the catalysts studied in this work, Pd(1 wt.%)In(0.25 wt.%)/Al2O3 is the most active one, but unfortunately, it presents an undesirable high selectivity towards ammonia when nitrate conversion reaches 100%. Pt(1.0%)In(0.25%)/Al2O3 presents a high initial activity but it fastly deactivates during reaction. In general, Pd-In catalysts are more active for nitrate conversion than Pt-In, and alumina is a better support than silica. The composition of the catalysts changes both after reduction and after contacting the liquid reaction media. These changes have been observed by XPS and TEM. In general, the samples used in the reaction have lower dispersion of metallic phases than the fresh-calcined ones. For most of the catalysts used in this work, the Pt:In or Pd:In surface ratio is lower than the bulk ones, this probably being the reason for the low amount of In that is sufficient to have an optimal performance for nitrate conversion.
Fil: Marchesini, Fernanda Albana. 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"; Argentina
Fil: Irusta, S.. Universidad de Zaragoza; España
Fil: Querini, Carlos Alberto. 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"; Argentina
Fil: Miro, Eduardo Ernesto. 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"; Argentina
description Bimetallic Pt-In and Pd-In catalysts supported on alumina or silica were studied for the reduction of nitrate to N2 in water, using H2 as reducing agent. Characterization results indicate that bimetallic particles with the surface enriched in indium, metallic crystals of Pt or Pd, and oxides of Pt or Pd and In2O3 are the main surface species present in the catalysts. Several catalysts studied in this work could fulfill the requirements usually established as limit values: 50 ppm of-NO3-, 0.1 ppm of NO2- and 0.5 ppm of NH4+. The reaction rate is strongly influenced by either the Pt:In or the Pd:In ratio, the optimum being observed at low contents of In. Of all the catalysts studied in this work, Pd(1 wt.%)In(0.25 wt.%)/Al2O3 is the most active one, but unfortunately, it presents an undesirable high selectivity towards ammonia when nitrate conversion reaches 100%. Pt(1.0%)In(0.25%)/Al2O3 presents a high initial activity but it fastly deactivates during reaction. In general, Pd-In catalysts are more active for nitrate conversion than Pt-In, and alumina is a better support than silica. The composition of the catalysts changes both after reduction and after contacting the liquid reaction media. These changes have been observed by XPS and TEM. In general, the samples used in the reaction have lower dispersion of metallic phases than the fresh-calcined ones. For most of the catalysts used in this work, the Pt:In or Pd:In surface ratio is lower than the bulk ones, this probably being the reason for the low amount of In that is sufficient to have an optimal performance for nitrate conversion.
publishDate 2008
dc.date.none.fl_str_mv 2008-09
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/11336/65153
Marchesini, Fernanda Albana; Irusta, S.; Querini, Carlos Alberto; Miro, Eduardo Ernesto; Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation; Elsevier Science; Applied Catalysis A: General; 348; 1; 9-2008; 60-70
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/65153
identifier_str_mv Marchesini, Fernanda Albana; Irusta, S.; Querini, Carlos Alberto; Miro, Eduardo Ernesto; Spectroscopic and catalytic characterization of Pd-In and Pt-In supported on Al2O3 and SiO2, active catalysts for nitrate hydrogenation; Elsevier Science; Applied Catalysis A: General; 348; 1; 9-2008; 60-70
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.2008.06.026
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 13.13397

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