Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water

In the present work, the elimination of NO3-, NO2- and BrO3- in distilled and groundwater samples using H2 as reducing agent is studied. For this purpose, PdCu-based catalysts were prepared on CeO2 pure and modified with 10 % of ZrO2 supports. The prepared catalysts were characterized by N2 physisor...

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Autores principales: Navas, Marisa Belén, Bideberripe, Hernán Pablo, Cabello, Carmen Inés, Gazzoli, Delia, Casella, Mónica Laura, Jaworski, María Angélica
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Química
CeO2
Nitrite
Bromate
CeO2-ZrO2 support
Nitrate
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/154152
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-154152
record_format dspace
spelling I19-R120-10915-1541522023-06-08T20:07:37Z http://sedici.unlp.edu.ar/handle/10915/154152 issn:0920-5861 Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water Navas, Marisa Belén Bideberripe, Hernán Pablo Cabello, Carmen Inés Gazzoli, Delia Casella, Mónica Laura Jaworski, María Angélica 2021 2023-06-08T18:15:37Z en Química CeO2 Nitrite Bromate CeO2-ZrO2 support Nitrate In the present work, the elimination of NO3-, NO2- and BrO3- in distilled and groundwater samples using H2 as reducing agent is studied. For this purpose, PdCu-based catalysts were prepared on CeO2 pure and modified with 10 % of ZrO2 supports. The prepared catalysts were characterized by N2 physisorption, SEM-EDS, XRD, TPR, RAMAN, FTIR and XPS. The results showed that the materials obtained were mesoporous, exposing the cubic CeO2 crystalline phase. Raman and FTIR analysis allow corroborating that both supports have oxygen vacancies, being higher in the ZrCe support, due to the presence of Zr4+ ions in the CeO2 lattice. All the prepared catalysts were active in the elimination of the selected oxyanions, showing high selectivities (>99 %) towards the product of interest (N2 and Br−), especially the catalyst PdCu/10ZrCe. This catalyst presented the highest oxyanion removal rate, which is higher for NO3− elimination (V0,NO3-: 5.6; V0,BrO3-:.0.93). In the reduction stage, Ce4+ is reduced to Ce3+, generating oxygen vacancies at the metal-support interface. It is postulated that the reduction of the anions occurs by interaction of the oxygen atoms of the NO3−, NO2− or BrO3− species with the oxygen-vacant sites generated. The addition of Zr on ceria support increases its ability to activate anions and reduce them. PdCu/10ZrCe catalyst was also tested using groundwater. The conversion results obtained were promising, 60 % for NO2−, 70 % for NO3− and 27 % for BrO3−. Centro de Investigación y Desarrollo en Ciencias Aplicadas Facultad de Ingeniería Comisión de Investigaciones Científicas de la provincia de Buenos Aires Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 154-163
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
CeO2
Nitrite
Bromate
CeO2-ZrO2 support
Nitrate
spellingShingle Química
CeO2
Nitrite
Bromate
CeO2-ZrO2 support
Nitrate
Navas, Marisa Belén
Bideberripe, Hernán Pablo
Cabello, Carmen Inés
Gazzoli, Delia
Casella, Mónica Laura
Jaworski, María Angélica
Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
topic_facet Química
CeO2
Nitrite
Bromate
CeO2-ZrO2 support
Nitrate
description In the present work, the elimination of NO3-, NO2- and BrO3- in distilled and groundwater samples using H2 as reducing agent is studied. For this purpose, PdCu-based catalysts were prepared on CeO2 pure and modified with 10 % of ZrO2 supports. The prepared catalysts were characterized by N2 physisorption, SEM-EDS, XRD, TPR, RAMAN, FTIR and XPS. The results showed that the materials obtained were mesoporous, exposing the cubic CeO2 crystalline phase. Raman and FTIR analysis allow corroborating that both supports have oxygen vacancies, being higher in the ZrCe support, due to the presence of Zr4+ ions in the CeO2 lattice. All the prepared catalysts were active in the elimination of the selected oxyanions, showing high selectivities (>99 %) towards the product of interest (N2 and Br−), especially the catalyst PdCu/10ZrCe. This catalyst presented the highest oxyanion removal rate, which is higher for NO3− elimination (V0,NO3-: 5.6; V0,BrO3-:.0.93). In the reduction stage, Ce4+ is reduced to Ce3+, generating oxygen vacancies at the metal-support interface. It is postulated that the reduction of the anions occurs by interaction of the oxygen atoms of the NO3−, NO2− or BrO3− species with the oxygen-vacant sites generated. The addition of Zr on ceria support increases its ability to activate anions and reduce them. PdCu/10ZrCe catalyst was also tested using groundwater. The conversion results obtained were promising, 60 % for NO2−, 70 % for NO3− and 27 % for BrO3−.
format Articulo
Articulo
author Navas, Marisa Belén
Bideberripe, Hernán Pablo
Cabello, Carmen Inés
Gazzoli, Delia
Casella, Mónica Laura
Jaworski, María Angélica
author_facet Navas, Marisa Belén
Bideberripe, Hernán Pablo
Cabello, Carmen Inés
Gazzoli, Delia
Casella, Mónica Laura
Jaworski, María Angélica
author_sort Navas, Marisa Belén
title Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
title_short Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
title_full Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
title_fullStr Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
title_full_unstemmed Use of PdCu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
title_sort use of pdcu catalysts supported on zirconia-ceria based supports for the elimination of oxyanions present in water
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/154152
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