Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor

Autores
Mendow, Gustavo; Marchesini, Fernanda Albana; Miro, Eduardo Ernesto; Querini, Carlos Alberto
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The increasing pollution of natural drinking-water sources brings about the development of new emerging technologies and processes for water remediation. In this work, the catalytic reduction of contaminated water containing nitrates (100 mg/L) was studied in a bubble column fixed-bed reactor, working at room temperature and atmospheric pressure and using hydrogen as a reducing agent. The activity and selectivity of these catalysts were evaluated under different reaction conditions (hydrogen flow, water flow, pH, acidifying agent) and verified in a stirred reactor, operating under batch conditions. On SiO2 supported catalysts, it was found that the nitrate conversion increased as theH2 flow was increased, while theN2 selectivity remained almost unaffected. On the other hand, in Al2O3 supported catalysts, an increase in H2 flow improved activity but worsened nitrogen selectivity. The best conversions and selectivity results were obtained when the feed solution was acidified with CO2. Very pronounced pH gradients or high amounts of OH- in the catalytic bed promoted nitrites and ammonium formation, provoking a notorious decrease of N2 selectivity. The highest conversion (100%) was obtained with the Al2O3 supported catalyst aged in the reaction. However, the selectivity to N2 under these conditions was 72%. On the other hand, the best selectivity to N2 was 97%, obtained with the aged SiO2 supported catalyst. In this case, the nitrate conversion was 30%. Characterization results showed that the metallic composition of the catalysts changed both after reduction and after contacting the liquid reaction media. These changes were observed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). The catalysts stability was studied and discussed.
Fil: Mendow, Gustavo. 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: 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: 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
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
Materia
Nitrates Abatement
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:11336/54018
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/54018
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous ReactorMendow, GustavoMarchesini, Fernanda AlbanaMiro, Eduardo ErnestoQuerini, Carlos AlbertoNitrates Abatementhttps://purl.org/becyt/ford/2.7https://purl.org/becyt/ford/2The increasing pollution of natural drinking-water sources brings about the development of new emerging technologies and processes for water remediation. In this work, the catalytic reduction of contaminated water containing nitrates (100 mg/L) was studied in a bubble column fixed-bed reactor, working at room temperature and atmospheric pressure and using hydrogen as a reducing agent. The activity and selectivity of these catalysts were evaluated under different reaction conditions (hydrogen flow, water flow, pH, acidifying agent) and verified in a stirred reactor, operating under batch conditions. On SiO2 supported catalysts, it was found that the nitrate conversion increased as theH2 flow was increased, while theN2 selectivity remained almost unaffected. On the other hand, in Al2O3 supported catalysts, an increase in H2 flow improved activity but worsened nitrogen selectivity. The best conversions and selectivity results were obtained when the feed solution was acidified with CO2. Very pronounced pH gradients or high amounts of OH- in the catalytic bed promoted nitrites and ammonium formation, provoking a notorious decrease of N2 selectivity. The highest conversion (100%) was obtained with the Al2O3 supported catalyst aged in the reaction. However, the selectivity to N2 under these conditions was 72%. On the other hand, the best selectivity to N2 was 97%, obtained with the aged SiO2 supported catalyst. In this case, the nitrate conversion was 30%. Characterization results showed that the metallic composition of the catalysts changed both after reduction and after contacting the liquid reaction media. These changes were observed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). The catalysts stability was studied and discussed.Fil: Mendow, Gustavo. 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: 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: 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"; ArgentinaFil: 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"; ArgentinaAmerican Chemical Society2011-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54018Mendow, Gustavo; Marchesini, Fernanda Albana; Miro, Eduardo Ernesto; Querini, Carlos Alberto; Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor; American Chemical Society; Industrial & Engineering Chemical Research; 50; 1-2011; 1911-19200888-5885CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/ie102080winfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:46:43Zoai:ri.conicet.gov.ar:11336/54018instacron: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 10:46:43.883CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
title Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
spellingShingle Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
Mendow, Gustavo
Nitrates Abatement
title_short Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
title_full Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
title_fullStr Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
title_full_unstemmed Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
title_sort Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor
dc.creator.none.fl_str_mv Mendow, Gustavo
Marchesini, Fernanda Albana
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author Mendow, Gustavo
author_facet Mendow, Gustavo
Marchesini, Fernanda Albana
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author_role author
author2 Marchesini, Fernanda Albana
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv Nitrates Abatement
topic Nitrates Abatement
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.7
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The increasing pollution of natural drinking-water sources brings about the development of new emerging technologies and processes for water remediation. In this work, the catalytic reduction of contaminated water containing nitrates (100 mg/L) was studied in a bubble column fixed-bed reactor, working at room temperature and atmospheric pressure and using hydrogen as a reducing agent. The activity and selectivity of these catalysts were evaluated under different reaction conditions (hydrogen flow, water flow, pH, acidifying agent) and verified in a stirred reactor, operating under batch conditions. On SiO2 supported catalysts, it was found that the nitrate conversion increased as theH2 flow was increased, while theN2 selectivity remained almost unaffected. On the other hand, in Al2O3 supported catalysts, an increase in H2 flow improved activity but worsened nitrogen selectivity. The best conversions and selectivity results were obtained when the feed solution was acidified with CO2. Very pronounced pH gradients or high amounts of OH- in the catalytic bed promoted nitrites and ammonium formation, provoking a notorious decrease of N2 selectivity. The highest conversion (100%) was obtained with the Al2O3 supported catalyst aged in the reaction. However, the selectivity to N2 under these conditions was 72%. On the other hand, the best selectivity to N2 was 97%, obtained with the aged SiO2 supported catalyst. In this case, the nitrate conversion was 30%. Characterization results showed that the metallic composition of the catalysts changed both after reduction and after contacting the liquid reaction media. These changes were observed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). The catalysts stability was studied and discussed.
Fil: Mendow, Gustavo. 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: 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: 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
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
description The increasing pollution of natural drinking-water sources brings about the development of new emerging technologies and processes for water remediation. In this work, the catalytic reduction of contaminated water containing nitrates (100 mg/L) was studied in a bubble column fixed-bed reactor, working at room temperature and atmospheric pressure and using hydrogen as a reducing agent. The activity and selectivity of these catalysts were evaluated under different reaction conditions (hydrogen flow, water flow, pH, acidifying agent) and verified in a stirred reactor, operating under batch conditions. On SiO2 supported catalysts, it was found that the nitrate conversion increased as theH2 flow was increased, while theN2 selectivity remained almost unaffected. On the other hand, in Al2O3 supported catalysts, an increase in H2 flow improved activity but worsened nitrogen selectivity. The best conversions and selectivity results were obtained when the feed solution was acidified with CO2. Very pronounced pH gradients or high amounts of OH- in the catalytic bed promoted nitrites and ammonium formation, provoking a notorious decrease of N2 selectivity. The highest conversion (100%) was obtained with the Al2O3 supported catalyst aged in the reaction. However, the selectivity to N2 under these conditions was 72%. On the other hand, the best selectivity to N2 was 97%, obtained with the aged SiO2 supported catalyst. In this case, the nitrate conversion was 30%. Characterization results showed that the metallic composition of the catalysts changed both after reduction and after contacting the liquid reaction media. These changes were observed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). The catalysts stability was studied and discussed.
publishDate 2011
dc.date.none.fl_str_mv 2011-01
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/11336/54018
Mendow, Gustavo; Marchesini, Fernanda Albana; Miro, Eduardo Ernesto; Querini, Carlos Alberto; Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor; American Chemical Society; Industrial & Engineering Chemical Research; 50; 1-2011; 1911-1920
0888-5885
CONICET Digital
CONICET
url http://hdl.handle.net/11336/54018
identifier_str_mv Mendow, Gustavo; Marchesini, Fernanda Albana; Miro, Eduardo Ernesto; Querini, Carlos Alberto; Evaluation of Pd-In Supported Catalysts for Water Nitrate Abatement in a Fixed-Bed Continuous Reactor; American Chemical Society; Industrial & Engineering Chemical Research; 50; 1-2011; 1911-1920
0888-5885
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1021/ie102080w
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 American Chemical Society
publisher.none.fl_str_mv American Chemical Society
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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