Effect of gadolinium on the catalytic properties of iron oxides for WGSR

Autores
Santos Silva, Caio Luis; Marchetti, Sergio Gustavo; da Costa Faro Júnior, Arnaldo; de Freitas Silva, Tatiana; Assaf, José Mansur; do Carmo Rangel, Maria
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Due to the need for energy supply through cleaner and more efficient technologies, the interest for the water gas shift reaction (WGSR) has increased especially due to its role in purifying hydrogen-rich streams. In order to find alternative catalysts for this reaction, the effect of gadolinium and its amount on the properties of iron oxide-based catalysts was studied in this work. Samples with different gadolinium to iron molar ratio (0.05; 0.1 and 0.15) were prepared by sol–gel method and characterized by chemical analysis, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, Mossbauer spectroscopy, specific surface area measurements and thermoprogrammed reduction. The catalysts were evaluated in WGSR at 1 atm in the range of 250–400 °C. Hematite and gadolinium ferrite were detected for all fresh catalysts based on iron and gadolinium while magnetite and iron carbides and gadolinium oxide were found for the spent ones. The specific surface area increased due to gadolinium, related to its role as spacer. Gadolinium made the reduction of Fe³⁺ and Fe²⁺ species more difficult for all catalysts and then inhibited the production of iron carbides during reaction, increasing the activity. The catalyst with Gd/Fe = 0.10 showed the highest activity that was assigned to its highest specific surface area, which exposed more active sites. No methane or ethane was found indicating that the iron carbides were inactive to Fischer–Tropsch synthesis under reaction conditions.
Centro de Investigación y Desarrollo en Ciencias Aplicadas
Materia
Química
Hydrogen
WGSR
Gadolinium ferrite
Hematite
MagnetiteIron carbide
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/127833

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spelling Effect of gadolinium on the catalytic properties of iron oxides for WGSRSantos Silva, Caio LuisMarchetti, Sergio Gustavoda Costa Faro Júnior, Arnaldode Freitas Silva, TatianaAssaf, José Mansurdo Carmo Rangel, MariaQuímicaHydrogenWGSRGadolinium ferriteHematiteMagnetiteIron carbideDue to the need for energy supply through cleaner and more efficient technologies, the interest for the water gas shift reaction (WGSR) has increased especially due to its role in purifying hydrogen-rich streams. In order to find alternative catalysts for this reaction, the effect of gadolinium and its amount on the properties of iron oxide-based catalysts was studied in this work. Samples with different gadolinium to iron molar ratio (0.05; 0.1 and 0.15) were prepared by sol–gel method and characterized by chemical analysis, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, Mossbauer spectroscopy, specific surface area measurements and thermoprogrammed reduction. The catalysts were evaluated in WGSR at 1 atm in the range of 250–400 °C. Hematite and gadolinium ferrite were detected for all fresh catalysts based on iron and gadolinium while magnetite and iron carbides and gadolinium oxide were found for the spent ones. The specific surface area increased due to gadolinium, related to its role as spacer. Gadolinium made the reduction of Fe³⁺ and Fe²⁺ species more difficult for all catalysts and then inhibited the production of iron carbides during reaction, increasing the activity. The catalyst with Gd/Fe = 0.10 showed the highest activity that was assigned to its highest specific surface area, which exposed more active sites. No methane or ethane was found indicating that the iron carbides were inactive to Fischer–Tropsch synthesis under reaction conditions.Centro de Investigación y Desarrollo en Ciencias Aplicadas2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf127-134http://sedici.unlp.edu.ar/handle/10915/127833enginfo:eu-repo/semantics/altIdentifier/issn/0920-5861info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cattod.2013.02.025info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:07Zoai:sedici.unlp.edu.ar:10915/127833Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:07.843SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Effect of gadolinium on the catalytic properties of iron oxides for WGSR
title Effect of gadolinium on the catalytic properties of iron oxides for WGSR
spellingShingle Effect of gadolinium on the catalytic properties of iron oxides for WGSR
Santos Silva, Caio Luis
Química
Hydrogen
WGSR
Gadolinium ferrite
Hematite
MagnetiteIron carbide
title_short Effect of gadolinium on the catalytic properties of iron oxides for WGSR
title_full Effect of gadolinium on the catalytic properties of iron oxides for WGSR
title_fullStr Effect of gadolinium on the catalytic properties of iron oxides for WGSR
title_full_unstemmed Effect of gadolinium on the catalytic properties of iron oxides for WGSR
title_sort Effect of gadolinium on the catalytic properties of iron oxides for WGSR
dc.creator.none.fl_str_mv Santos Silva, Caio Luis
Marchetti, Sergio Gustavo
da Costa Faro Júnior, Arnaldo
de Freitas Silva, Tatiana
Assaf, José Mansur
do Carmo Rangel, Maria
author Santos Silva, Caio Luis
author_facet Santos Silva, Caio Luis
Marchetti, Sergio Gustavo
da Costa Faro Júnior, Arnaldo
de Freitas Silva, Tatiana
Assaf, José Mansur
do Carmo Rangel, Maria
author_role author
author2 Marchetti, Sergio Gustavo
da Costa Faro Júnior, Arnaldo
de Freitas Silva, Tatiana
Assaf, José Mansur
do Carmo Rangel, Maria
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Química
Hydrogen
WGSR
Gadolinium ferrite
Hematite
MagnetiteIron carbide
topic Química
Hydrogen
WGSR
Gadolinium ferrite
Hematite
MagnetiteIron carbide
dc.description.none.fl_txt_mv Due to the need for energy supply through cleaner and more efficient technologies, the interest for the water gas shift reaction (WGSR) has increased especially due to its role in purifying hydrogen-rich streams. In order to find alternative catalysts for this reaction, the effect of gadolinium and its amount on the properties of iron oxide-based catalysts was studied in this work. Samples with different gadolinium to iron molar ratio (0.05; 0.1 and 0.15) were prepared by sol–gel method and characterized by chemical analysis, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, Mossbauer spectroscopy, specific surface area measurements and thermoprogrammed reduction. The catalysts were evaluated in WGSR at 1 atm in the range of 250–400 °C. Hematite and gadolinium ferrite were detected for all fresh catalysts based on iron and gadolinium while magnetite and iron carbides and gadolinium oxide were found for the spent ones. The specific surface area increased due to gadolinium, related to its role as spacer. Gadolinium made the reduction of Fe³⁺ and Fe²⁺ species more difficult for all catalysts and then inhibited the production of iron carbides during reaction, increasing the activity. The catalyst with Gd/Fe = 0.10 showed the highest activity that was assigned to its highest specific surface area, which exposed more active sites. No methane or ethane was found indicating that the iron carbides were inactive to Fischer–Tropsch synthesis under reaction conditions.
Centro de Investigación y Desarrollo en Ciencias Aplicadas
description Due to the need for energy supply through cleaner and more efficient technologies, the interest for the water gas shift reaction (WGSR) has increased especially due to its role in purifying hydrogen-rich streams. In order to find alternative catalysts for this reaction, the effect of gadolinium and its amount on the properties of iron oxide-based catalysts was studied in this work. Samples with different gadolinium to iron molar ratio (0.05; 0.1 and 0.15) were prepared by sol–gel method and characterized by chemical analysis, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, Mossbauer spectroscopy, specific surface area measurements and thermoprogrammed reduction. The catalysts were evaluated in WGSR at 1 atm in the range of 250–400 °C. Hematite and gadolinium ferrite were detected for all fresh catalysts based on iron and gadolinium while magnetite and iron carbides and gadolinium oxide were found for the spent ones. The specific surface area increased due to gadolinium, related to its role as spacer. Gadolinium made the reduction of Fe³⁺ and Fe²⁺ species more difficult for all catalysts and then inhibited the production of iron carbides during reaction, increasing the activity. The catalyst with Gd/Fe = 0.10 showed the highest activity that was assigned to its highest specific surface area, which exposed more active sites. No methane or ethane was found indicating that the iron carbides were inactive to Fischer–Tropsch synthesis under reaction conditions.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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dc.language.none.fl_str_mv eng
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cattod.2013.02.025
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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