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

Detalhes bibliográficos
Autor(a) principal: Silva, Caio Luis Santos
Data de Publicação: 2013
Outros Autores: Marchetti, Sérgio Gustavo, Faro Júnior, Arnaldo da Costa, Silva, Tatiana de Freitas, Assaf, José Mansur, Varela, Maria do Carmo Rangel Santos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/13159
Resumo: Texto completo. Acesso restrito. p. 127–134
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spelling Silva, Caio Luis SantosMarchetti, Sérgio GustavoFaro Júnior, Arnaldo da CostaSilva, Tatiana de FreitasAssaf, José MansurVarela, Maria do Carmo Rangel SantosSilva, Caio Luis SantosMarchetti, Sérgio GustavoFaro Júnior, Arnaldo da CostaSilva, Tatiana de FreitasAssaf, José MansurVarela, Maria do Carmo Rangel Santos2013-10-08T19:59:32Z2013-10-08T19:59:32Z20130920-5861http://www.repositorio.ufba.br/ri/handle/ri/13159v. 213Texto completo. Acesso restrito. p. 127–134Due 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, Mössbauer 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.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-10-08T19:59:32Z No. of bitstreams: 1 555555555555.pdf: 1383700 bytes, checksum: d3af0a00f17046b902154d796f583539 (MD5)Made available in DSpace on 2013-10-08T19:59:32Z (GMT). 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dc.title.pt_BR.fl_str_mv Effect of gadolinium on the catalytic properties of iron oxides for WGSR
dc.title.alternative.pt_BR.fl_str_mv Catalysis Today
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
Silva, Caio Luis Santos
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
author Silva, Caio Luis Santos
author_facet Silva, Caio Luis Santos
Marchetti, Sérgio Gustavo
Faro Júnior, Arnaldo da Costa
Silva, Tatiana de Freitas
Assaf, José Mansur
Varela, Maria do Carmo Rangel Santos
author_role author
author2 Marchetti, Sérgio Gustavo
Faro Júnior, Arnaldo da Costa
Silva, Tatiana de Freitas
Assaf, José Mansur
Varela, Maria do Carmo Rangel Santos
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Silva, Caio Luis Santos
Marchetti, Sérgio Gustavo
Faro Júnior, Arnaldo da Costa
Silva, Tatiana de Freitas
Assaf, José Mansur
Varela, Maria do Carmo Rangel Santos
Silva, Caio Luis Santos
Marchetti, Sérgio Gustavo
Faro Júnior, Arnaldo da Costa
Silva, Tatiana de Freitas
Assaf, José Mansur
Varela, Maria do Carmo Rangel Santos
description Texto completo. Acesso restrito. p. 127–134
publishDate 2013
dc.date.accessioned.fl_str_mv 2013-10-08T19:59:32Z
dc.date.available.fl_str_mv 2013-10-08T19:59:32Z
dc.date.issued.fl_str_mv 2013
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/13159
dc.identifier.issn.none.fl_str_mv 0920-5861
dc.identifier.number.pt_BR.fl_str_mv v. 213
identifier_str_mv 0920-5861
v. 213
url http://www.repositorio.ufba.br/ri/handle/ri/13159
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Catalysis Today
publisher.none.fl_str_mv Catalysis Today
dc.source.pt_BR.fl_str_mv http://www-sciencedirect-com.ez10.periodicos.capes.gov.br/science/article/pii/S0920586113001053
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