A spectroscopic study of Au/CeX Zr1-X O2 catalysts

Detalhes bibliográficos
Autor(a) principal: Ferreira,Hadma Sousa
Data de Publicação: 2009
Outros Autores: Rangel,Maria do Carmo, Ferreira,Márcio L.O., Pepe,Iuri, Silva,Antônio Ferreira da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Journal of Physics
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332009000200003
Resumo: The nature of gold species in Au/CeX Zr1-X O2 catalysts was successfully investigated using the visible and near infrared photoacoustic spectroscopy and Fourier transform infrared spectroscopy of adsorbed carbon monoxide. It was found that the visible and near infrared photoacoustic spectroscopy is a powerful technique for investigating the changes of gold particle size due to addition of zirconium and the oxidation state of gold particles. It was also noted that the increase of zirconium in the solids makes gold incorporation more difficult due to the electronic shielding caused by zirconium, decreasing the probability of replacing cerium by gold. For the samples studied, the particle size ranged from 20-30 nm and the Au+, Au3+ and Auº species were found in the catalysts.
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spelling A spectroscopic study of Au/CeX Zr1-X O2 catalystsgold catalystsphotoacoustic spectroscopyCO adsorbedThe nature of gold species in Au/CeX Zr1-X O2 catalysts was successfully investigated using the visible and near infrared photoacoustic spectroscopy and Fourier transform infrared spectroscopy of adsorbed carbon monoxide. It was found that the visible and near infrared photoacoustic spectroscopy is a powerful technique for investigating the changes of gold particle size due to addition of zirconium and the oxidation state of gold particles. It was also noted that the increase of zirconium in the solids makes gold incorporation more difficult due to the electronic shielding caused by zirconium, decreasing the probability of replacing cerium by gold. For the samples studied, the particle size ranged from 20-30 nm and the Au+, Au3+ and Auº species were found in the catalysts.Sociedade Brasileira de Física2009-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332009000200003Brazilian Journal of Physics v.39 n.1a 2009reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332009000200003info:eu-repo/semantics/openAccessFerreira,Hadma SousaRangel,Maria do CarmoFerreira,Márcio L.O.Pepe,IuriSilva,Antônio Ferreira daeng2009-07-03T00:00:00Zoai:scielo:S0103-97332009000200003Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2009-07-03T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false
dc.title.none.fl_str_mv A spectroscopic study of Au/CeX Zr1-X O2 catalysts
title A spectroscopic study of Au/CeX Zr1-X O2 catalysts
spellingShingle A spectroscopic study of Au/CeX Zr1-X O2 catalysts
Ferreira,Hadma Sousa
gold catalysts
photoacoustic spectroscopy
CO adsorbed
title_short A spectroscopic study of Au/CeX Zr1-X O2 catalysts
title_full A spectroscopic study of Au/CeX Zr1-X O2 catalysts
title_fullStr A spectroscopic study of Au/CeX Zr1-X O2 catalysts
title_full_unstemmed A spectroscopic study of Au/CeX Zr1-X O2 catalysts
title_sort A spectroscopic study of Au/CeX Zr1-X O2 catalysts
author Ferreira,Hadma Sousa
author_facet Ferreira,Hadma Sousa
Rangel,Maria do Carmo
Ferreira,Márcio L.O.
Pepe,Iuri
Silva,Antônio Ferreira da
author_role author
author2 Rangel,Maria do Carmo
Ferreira,Márcio L.O.
Pepe,Iuri
Silva,Antônio Ferreira da
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Ferreira,Hadma Sousa
Rangel,Maria do Carmo
Ferreira,Márcio L.O.
Pepe,Iuri
Silva,Antônio Ferreira da
dc.subject.por.fl_str_mv gold catalysts
photoacoustic spectroscopy
CO adsorbed
topic gold catalysts
photoacoustic spectroscopy
CO adsorbed
description The nature of gold species in Au/CeX Zr1-X O2 catalysts was successfully investigated using the visible and near infrared photoacoustic spectroscopy and Fourier transform infrared spectroscopy of adsorbed carbon monoxide. It was found that the visible and near infrared photoacoustic spectroscopy is a powerful technique for investigating the changes of gold particle size due to addition of zirconium and the oxidation state of gold particles. It was also noted that the increase of zirconium in the solids makes gold incorporation more difficult due to the electronic shielding caused by zirconium, decreasing the probability of replacing cerium by gold. For the samples studied, the particle size ranged from 20-30 nm and the Au+, Au3+ and Auº species were found in the catalysts.
publishDate 2009
dc.date.none.fl_str_mv 2009-04-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332009000200003
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332009000200003
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-97332009000200003
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Física
publisher.none.fl_str_mv Sociedade Brasileira de Física
dc.source.none.fl_str_mv Brazilian Journal of Physics v.39 n.1a 2009
reponame:Brazilian Journal of Physics
instname:Sociedade Brasileira de Física (SBF)
instacron:SBF
instname_str Sociedade Brasileira de Física (SBF)
instacron_str SBF
institution SBF
reponame_str Brazilian Journal of Physics
collection Brazilian Journal of Physics
repository.name.fl_str_mv Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)
repository.mail.fl_str_mv sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br
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