NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts

Autores
Díaz Cónsul, Julia María; Costilla, Ignacio Oscar; Gigola, Carlos Eugenio; Baibich, Ione Maluf
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this work, Pd and Mo-Pd catalysts supported on Al2O3 modified SiO2 and Si-MCM-41 materials were prepared, characterized by H2 chemisorption and FTIR spectroscopy of adsorbed CO and NO and tested for the reduction of NO with CO. The characterization results indicated that in the bimetallic catalysts, Mo that is loaded first, migrates over the Pd atoms and reduced the fraction of exposed metal atoms. The reduction of NO with CO at 523 K showed that the specific activity for NO conversion increased as a result of the Pd-Mo interaction. In the 523–573 K temperature range NH3 was produced in addition to CO2, N2 and N2O. This result suggests the reaction of NCO species formed on the Pd surface with OH groups of the support materials to produce isocyanic acid (HNCO) that is hydrolyzed to NH3. The catalysts exhibited a decreasing selectivity to N2O and a parallel increase in the production of N2 and NH3 as the conversion increases. The effect of Mo on the reaction selectivity was clear for Pd/Al2O3/SiO2; at similar NO conversion level the selectivity to N2O and N2 decreased with increasing NH3 formation. FTIR spectra of adsorbed species under reaction conditions demonstrated the absence of isocyanate species and the presence of NH4 + ions in accordance with the high Brønsted acidity of the support materials.
Fil: Díaz Cónsul, Julia María. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Costilla, Ignacio Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Baibich, Ione Maluf. Universidade Federal do Rio Grande do Sul; Brasil
Materia
Mcm-41
Mo-Pd Catalyst
Pd Catalyst
No Reduction with Co
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:11336/41976
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/41976
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalystsDíaz Cónsul, Julia MaríaCostilla, Ignacio OscarGigola, Carlos EugenioBaibich, Ione MalufMcm-41Mo-Pd CatalystPd CatalystNo Reduction with Cohttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2In this work, Pd and Mo-Pd catalysts supported on Al2O3 modified SiO2 and Si-MCM-41 materials were prepared, characterized by H2 chemisorption and FTIR spectroscopy of adsorbed CO and NO and tested for the reduction of NO with CO. The characterization results indicated that in the bimetallic catalysts, Mo that is loaded first, migrates over the Pd atoms and reduced the fraction of exposed metal atoms. The reduction of NO with CO at 523 K showed that the specific activity for NO conversion increased as a result of the Pd-Mo interaction. In the 523–573 K temperature range NH3 was produced in addition to CO2, N2 and N2O. This result suggests the reaction of NCO species formed on the Pd surface with OH groups of the support materials to produce isocyanic acid (HNCO) that is hydrolyzed to NH3. The catalysts exhibited a decreasing selectivity to N2O and a parallel increase in the production of N2 and NH3 as the conversion increases. The effect of Mo on the reaction selectivity was clear for Pd/Al2O3/SiO2; at similar NO conversion level the selectivity to N2O and N2 decreased with increasing NH3 formation. FTIR spectra of adsorbed species under reaction conditions demonstrated the absence of isocyanate species and the presence of NH4 + ions in accordance with the high Brønsted acidity of the support materials.Fil: Díaz Cónsul, Julia María. Universidade Federal do Rio Grande do Sul; BrasilFil: Costilla, Ignacio Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Baibich, Ione Maluf. Universidade Federal do Rio Grande do Sul; BrasilElsevier Science2008-05info: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/11336/41976Díaz Cónsul, Julia María; Costilla, Ignacio Oscar; Gigola, Carlos Eugenio; Baibich, Ione Maluf; NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts; Elsevier Science; Applied Catalysis A: General; 339; 2; 5-2008; 151-1580926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2008.01.022info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X08000422info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:43Zoai:ri.conicet.gov.ar:11336/41976instacron: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 09:47:43.722CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
title NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
spellingShingle NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
Díaz Cónsul, Julia María
Mcm-41
Mo-Pd Catalyst
Pd Catalyst
No Reduction with Co
title_short NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
title_full NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
title_fullStr NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
title_full_unstemmed NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
title_sort NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts
dc.creator.none.fl_str_mv Díaz Cónsul, Julia María
Costilla, Ignacio Oscar
Gigola, Carlos Eugenio
Baibich, Ione Maluf
author Díaz Cónsul, Julia María
author_facet Díaz Cónsul, Julia María
Costilla, Ignacio Oscar
Gigola, Carlos Eugenio
Baibich, Ione Maluf
author_role author
author2 Costilla, Ignacio Oscar
Gigola, Carlos Eugenio
Baibich, Ione Maluf
author2_role author
author
author
dc.subject.none.fl_str_mv Mcm-41
Mo-Pd Catalyst
Pd Catalyst
No Reduction with Co
topic Mcm-41
Mo-Pd Catalyst
Pd Catalyst
No Reduction with Co
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv In this work, Pd and Mo-Pd catalysts supported on Al2O3 modified SiO2 and Si-MCM-41 materials were prepared, characterized by H2 chemisorption and FTIR spectroscopy of adsorbed CO and NO and tested for the reduction of NO with CO. The characterization results indicated that in the bimetallic catalysts, Mo that is loaded first, migrates over the Pd atoms and reduced the fraction of exposed metal atoms. The reduction of NO with CO at 523 K showed that the specific activity for NO conversion increased as a result of the Pd-Mo interaction. In the 523–573 K temperature range NH3 was produced in addition to CO2, N2 and N2O. This result suggests the reaction of NCO species formed on the Pd surface with OH groups of the support materials to produce isocyanic acid (HNCO) that is hydrolyzed to NH3. The catalysts exhibited a decreasing selectivity to N2O and a parallel increase in the production of N2 and NH3 as the conversion increases. The effect of Mo on the reaction selectivity was clear for Pd/Al2O3/SiO2; at similar NO conversion level the selectivity to N2O and N2 decreased with increasing NH3 formation. FTIR spectra of adsorbed species under reaction conditions demonstrated the absence of isocyanate species and the presence of NH4 + ions in accordance with the high Brønsted acidity of the support materials.
Fil: Díaz Cónsul, Julia María. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Costilla, Ignacio Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Baibich, Ione Maluf. Universidade Federal do Rio Grande do Sul; Brasil
description In this work, Pd and Mo-Pd catalysts supported on Al2O3 modified SiO2 and Si-MCM-41 materials were prepared, characterized by H2 chemisorption and FTIR spectroscopy of adsorbed CO and NO and tested for the reduction of NO with CO. The characterization results indicated that in the bimetallic catalysts, Mo that is loaded first, migrates over the Pd atoms and reduced the fraction of exposed metal atoms. The reduction of NO with CO at 523 K showed that the specific activity for NO conversion increased as a result of the Pd-Mo interaction. In the 523–573 K temperature range NH3 was produced in addition to CO2, N2 and N2O. This result suggests the reaction of NCO species formed on the Pd surface with OH groups of the support materials to produce isocyanic acid (HNCO) that is hydrolyzed to NH3. The catalysts exhibited a decreasing selectivity to N2O and a parallel increase in the production of N2 and NH3 as the conversion increases. The effect of Mo on the reaction selectivity was clear for Pd/Al2O3/SiO2; at similar NO conversion level the selectivity to N2O and N2 decreased with increasing NH3 formation. FTIR spectra of adsorbed species under reaction conditions demonstrated the absence of isocyanate species and the presence of NH4 + ions in accordance with the high Brønsted acidity of the support materials.
publishDate 2008
dc.date.none.fl_str_mv 2008-05
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/11336/41976
Díaz Cónsul, Julia María; Costilla, Ignacio Oscar; Gigola, Carlos Eugenio; Baibich, Ione Maluf; NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts; Elsevier Science; Applied Catalysis A: General; 339; 2; 5-2008; 151-158
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/41976
identifier_str_mv Díaz Cónsul, Julia María; Costilla, Ignacio Oscar; Gigola, Carlos Eugenio; Baibich, Ione Maluf; NO reduction with CO on alumina-modified silica-supported palladium and molybdenum-palladium catalysts; Elsevier Science; Applied Catalysis A: General; 339; 2; 5-2008; 151-158
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.2008.01.022
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X08000422
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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