CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD

Detalhes bibliográficos
Autor(a) principal: Villagrán-Olivares,Alejandra C.
Data de Publicação: 2018
Outros Autores: Barroso,Mariana N., Abello,Maria C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000800899
Resumo: MgAl2O4 spinel employed as support of reforming catalysts was doped by CeO2. The samples were prepared by wet impregnation from aqueous solutions of cerium nitrate, with and without chelating agents. The chelating agents used were ethylenediamine-tetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and citric acid (CA) at different pH of impregnation. The solids were characterized by TG, XRD, SBET, TPR, SEM-EDX and CO2-TPD. Nanoparticles of CeO2 between 5 and 6.8 nm were obtained by the thermal decomposition in air at 600 °C. The surface cerium reduction occurred in a wide temperature range of 450° to 670 °C. The use of citric acid at pH= 8 led to the lowest crystallite size of CeO2 and the lowest interaction with the spinel. The H2 consumption and extent of CeO2-support interaction did not show a clear dependence with the CeO2 crystallite sizes. The use of chelating agents in the impregnation step did not modify the total basicity. Slight changes in the strength of weak basic sites were observed.
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spelling CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHODceria impregnationCeO2-MgAl2O4chelating agentschemical synthesissurface propertiesMgAl2O4 spinel employed as support of reforming catalysts was doped by CeO2. The samples were prepared by wet impregnation from aqueous solutions of cerium nitrate, with and without chelating agents. The chelating agents used were ethylenediamine-tetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and citric acid (CA) at different pH of impregnation. The solids were characterized by TG, XRD, SBET, TPR, SEM-EDX and CO2-TPD. Nanoparticles of CeO2 between 5 and 6.8 nm were obtained by the thermal decomposition in air at 600 °C. The surface cerium reduction occurred in a wide temperature range of 450° to 670 °C. The use of citric acid at pH= 8 led to the lowest crystallite size of CeO2 and the lowest interaction with the spinel. The H2 consumption and extent of CeO2-support interaction did not show a clear dependence with the CeO2 crystallite sizes. The use of chelating agents in the impregnation step did not modify the total basicity. Slight changes in the strength of weak basic sites were observed.Sociedade Brasileira de Química2018-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000800899Química Nova v.41 n.8 2018reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.21577/0100-4042.20170265info:eu-repo/semantics/openAccessVillagrán-Olivares,Alejandra C.Barroso,Mariana N.Abello,Maria C.eng2018-10-16T00:00:00Zoai:scielo:S0100-40422018000800899Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2018-10-16T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
title CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
spellingShingle CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
Villagrán-Olivares,Alejandra C.
ceria impregnation
CeO2-MgAl2O4
chelating agents
chemical synthesis
surface properties
title_short CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
title_full CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
title_fullStr CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
title_full_unstemmed CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
title_sort CHARACTERIZATION OF CEO2 DOPED MGAL2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
author Villagrán-Olivares,Alejandra C.
author_facet Villagrán-Olivares,Alejandra C.
Barroso,Mariana N.
Abello,Maria C.
author_role author
author2 Barroso,Mariana N.
Abello,Maria C.
author2_role author
author
dc.contributor.author.fl_str_mv Villagrán-Olivares,Alejandra C.
Barroso,Mariana N.
Abello,Maria C.
dc.subject.por.fl_str_mv ceria impregnation
CeO2-MgAl2O4
chelating agents
chemical synthesis
surface properties
topic ceria impregnation
CeO2-MgAl2O4
chelating agents
chemical synthesis
surface properties
description MgAl2O4 spinel employed as support of reforming catalysts was doped by CeO2. The samples were prepared by wet impregnation from aqueous solutions of cerium nitrate, with and without chelating agents. The chelating agents used were ethylenediamine-tetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and citric acid (CA) at different pH of impregnation. The solids were characterized by TG, XRD, SBET, TPR, SEM-EDX and CO2-TPD. Nanoparticles of CeO2 between 5 and 6.8 nm were obtained by the thermal decomposition in air at 600 °C. The surface cerium reduction occurred in a wide temperature range of 450° to 670 °C. The use of citric acid at pH= 8 led to the lowest crystallite size of CeO2 and the lowest interaction with the spinel. The H2 consumption and extent of CeO2-support interaction did not show a clear dependence with the CeO2 crystallite sizes. The use of chelating agents in the impregnation step did not modify the total basicity. Slight changes in the strength of weak basic sites were observed.
publishDate 2018
dc.date.none.fl_str_mv 2018-08-01
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=S0100-40422018000800899
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000800899
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.21577/0100-4042.20170265
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 Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.41 n.8 2018
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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