Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400024 |
Resumo: | The physico-chemical properties of a series of Ni,Mg,Al-HTLC with Al/(Al+Mg+Ni) = 0.25 and low Ni/Mg ratios were studied by means of X-ray diffraction (XRD), thermogravimetric (TGA) and thermodifferential (DTA) analysis, N2 physissorption and temperature programmed reduction (TPR). The as-synthesized materials were well-crystallized, with XRD patterns typical of the HTLCs in carbonate form. Upon calcination and dehydration the dehydroxilation of the layers with concurrent decomposition of carbonate anions produced mixed oxides with high surface area. XRD analysis indicated that the different nickel and aluminum oxides species are well-dispersed in a poor-crystallized MgO periclase-type phase. As observed by TPR, the different Ni species showed distinct interactions with Mg(Al)O phase, which were influenced by both nickel content and calcination temperature. Regardless of the the nickel content, the reduction of nickel species was not complete as indicated by the presence of metallic dispersions. |
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Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compoundshydrotalcitesnickelmixed oxidesNi,Mg,Al-HTLCThe physico-chemical properties of a series of Ni,Mg,Al-HTLC with Al/(Al+Mg+Ni) = 0.25 and low Ni/Mg ratios were studied by means of X-ray diffraction (XRD), thermogravimetric (TGA) and thermodifferential (DTA) analysis, N2 physissorption and temperature programmed reduction (TPR). The as-synthesized materials were well-crystallized, with XRD patterns typical of the HTLCs in carbonate form. Upon calcination and dehydration the dehydroxilation of the layers with concurrent decomposition of carbonate anions produced mixed oxides with high surface area. XRD analysis indicated that the different nickel and aluminum oxides species are well-dispersed in a poor-crystallized MgO periclase-type phase. As observed by TPR, the different Ni species showed distinct interactions with Mg(Al)O phase, which were influenced by both nickel content and calcination temperature. Regardless of the the nickel content, the reduction of nickel species was not complete as indicated by the presence of metallic dispersions.ABM, ABC, ABPol2003-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400024Materials Research v.6 n.4 2003reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392003000400024info:eu-repo/semantics/openAccessRodrigues,Alexandre Carlos CamachoHenriques,Cristiane AssumpçãoMonteiro,José Luiz Fonteseng2004-01-19T00:00:00Zoai:scielo:S1516-14392003000400024Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2004-01-19T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
title |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
spellingShingle |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds Rodrigues,Alexandre Carlos Camacho hydrotalcites nickel mixed oxides Ni,Mg,Al-HTLC |
title_short |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
title_full |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
title_fullStr |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
title_full_unstemmed |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
title_sort |
Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compounds |
author |
Rodrigues,Alexandre Carlos Camacho |
author_facet |
Rodrigues,Alexandre Carlos Camacho Henriques,Cristiane Assumpção Monteiro,José Luiz Fontes |
author_role |
author |
author2 |
Henriques,Cristiane Assumpção Monteiro,José Luiz Fontes |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Rodrigues,Alexandre Carlos Camacho Henriques,Cristiane Assumpção Monteiro,José Luiz Fontes |
dc.subject.por.fl_str_mv |
hydrotalcites nickel mixed oxides Ni,Mg,Al-HTLC |
topic |
hydrotalcites nickel mixed oxides Ni,Mg,Al-HTLC |
description |
The physico-chemical properties of a series of Ni,Mg,Al-HTLC with Al/(Al+Mg+Ni) = 0.25 and low Ni/Mg ratios were studied by means of X-ray diffraction (XRD), thermogravimetric (TGA) and thermodifferential (DTA) analysis, N2 physissorption and temperature programmed reduction (TPR). The as-synthesized materials were well-crystallized, with XRD patterns typical of the HTLCs in carbonate form. Upon calcination and dehydration the dehydroxilation of the layers with concurrent decomposition of carbonate anions produced mixed oxides with high surface area. XRD analysis indicated that the different nickel and aluminum oxides species are well-dispersed in a poor-crystallized MgO periclase-type phase. As observed by TPR, the different Ni species showed distinct interactions with Mg(Al)O phase, which were influenced by both nickel content and calcination temperature. Regardless of the the nickel content, the reduction of nickel species was not complete as indicated by the presence of metallic dispersions. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-01 |
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=S1516-14392003000400024 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400024 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1516-14392003000400024 |
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 |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.6 n.4 2003 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212657397760000 |