The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Detalhes bibliográficos
Autor(a) principal: Guimarães,André L.
Data de Publicação: 2004
Outros Autores: Dieguez,Lídia C., Schmal,Martin
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400014
Resumo: The influence of the precursors on the promoting effect of ceria on Pd/Al2O3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS). XPS and DRS results show that PdO/Pd0 interface are the active sites independent of the precursor, while the catalysts containing CeO2 showed formation of palladium species in the highest oxidation state, probably PdO2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO2. In addition, the precursor acetylacetonate favors the oxygen storage in the lattice.
id ABC-1_fe96619d6a1c6e3607fea3859f37be7d
oai_identifier_str oai:scielo:S0001-37652004000400014
network_acronym_str ABC-1
network_name_str Anais da Academia Brasileira de Ciências (Online)
repository_id_str
spelling The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalystsPalladiumcerium oxideprecursorscharacterizationThe influence of the precursors on the promoting effect of ceria on Pd/Al2O3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS). XPS and DRS results show that PdO/Pd0 interface are the active sites independent of the precursor, while the catalysts containing CeO2 showed formation of palladium species in the highest oxidation state, probably PdO2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO2. In addition, the precursor acetylacetonate favors the oxygen storage in the lattice.Academia Brasileira de Ciências2004-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400014Anais da Academia Brasileira de Ciências v.76 n.4 2004reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652004000400014info:eu-repo/semantics/openAccessGuimarães,André L.Dieguez,Lídia C.Schmal,Martineng2004-11-22T00:00:00Zoai:scielo:S0001-37652004000400014Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2004-11-22T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
title The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
spellingShingle The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
Guimarães,André L.
Palladium
cerium oxide
precursors
characterization
title_short The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
title_full The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
title_fullStr The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
title_full_unstemmed The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
title_sort The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts
author Guimarães,André L.
author_facet Guimarães,André L.
Dieguez,Lídia C.
Schmal,Martin
author_role author
author2 Dieguez,Lídia C.
Schmal,Martin
author2_role author
author
dc.contributor.author.fl_str_mv Guimarães,André L.
Dieguez,Lídia C.
Schmal,Martin
dc.subject.por.fl_str_mv Palladium
cerium oxide
precursors
characterization
topic Palladium
cerium oxide
precursors
characterization
description The influence of the precursors on the promoting effect of ceria on Pd/Al2O3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS). XPS and DRS results show that PdO/Pd0 interface are the active sites independent of the precursor, while the catalysts containing CeO2 showed formation of palladium species in the highest oxidation state, probably PdO2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO2. In addition, the precursor acetylacetonate favors the oxygen storage in the lattice.
publishDate 2004
dc.date.none.fl_str_mv 2004-12-01
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=S0001-37652004000400014
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000400014
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652004000400014
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 Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.76 n.4 2004
reponame:Anais da Academia Brasileira de Ciências (Online)
instname:Academia Brasileira de Ciências (ABC)
instacron:ABC
instname_str Academia Brasileira de Ciências (ABC)
instacron_str ABC
institution ABC
reponame_str Anais da Academia Brasileira de Ciências (Online)
collection Anais da Academia Brasileira de Ciências (Online)
repository.name.fl_str_mv Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)
repository.mail.fl_str_mv ||aabc@abc.org.br
_version_ 1754302856183152640

Registros relacionados