Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531999000600010 |
Resumo: | The electrocatalytic oxidation of formic acid and formaldehyde on Pd and on amorphous Pd(Si) was studied by cyclic voltammetry and the results compared with the literature for similar systems. The oxidation of HCOOH on Pd occurs through direct catalytic dehydrogenation via (:C(OH)2)ads while on Pd(Si) this intermediate does not appear to be formed. This is a consequence of the presence of inert Si on the surface that diminishes the probability of adjacent free sites. At high HCOOH concentrations, that intermediate undergoes dehydration on the Pd surface and COads oxidation peak is observed. For HCHO, the oxidation mechanism on both electrode materials appears similar to that previously proposed for Pt. However, the oxides formed on the amorphous Pd(Si) alloy are more reactive than those on Pd thus affecting the overall kinetics of the process for both organic molecules, a fact revealed by the increase in anodic currents observed in the voltammograms. |
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Journal of the Brazilian Chemical Society (Online) |
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Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigationformic acidformaldehydepalladiumamorphous metallic alloyselectrocatalytic oxidationThe electrocatalytic oxidation of formic acid and formaldehyde on Pd and on amorphous Pd(Si) was studied by cyclic voltammetry and the results compared with the literature for similar systems. The oxidation of HCOOH on Pd occurs through direct catalytic dehydrogenation via (:C(OH)2)ads while on Pd(Si) this intermediate does not appear to be formed. This is a consequence of the presence of inert Si on the surface that diminishes the probability of adjacent free sites. At high HCOOH concentrations, that intermediate undergoes dehydration on the Pd surface and COads oxidation peak is observed. For HCHO, the oxidation mechanism on both electrode materials appears similar to that previously proposed for Pt. However, the oxides formed on the amorphous Pd(Si) alloy are more reactive than those on Pd thus affecting the overall kinetics of the process for both organic molecules, a fact revealed by the increase in anodic currents observed in the voltammograms.Sociedade Brasileira de Química1999-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531999000600010Journal of the Brazilian Chemical Society v.10 n.6 1999reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531999000600010info:eu-repo/semantics/openAccessCorreia,A.N.Mascaro,L.H.Machado,S.A.S.Avaca,L.A.eng2001-06-01T00:00:00Zoai:scielo:S0103-50531999000600010Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2001-06-01T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
title |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
spellingShingle |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation Correia,A.N. formic acid formaldehyde palladium amorphous metallic alloys electrocatalytic oxidation |
title_short |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
title_full |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
title_fullStr |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
title_full_unstemmed |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
title_sort |
Amorphous palladium-silicon alloys for the oxidation of formic acid and formaldehyde. A voltammetric investigation |
author |
Correia,A.N. |
author_facet |
Correia,A.N. Mascaro,L.H. Machado,S.A.S. Avaca,L.A. |
author_role |
author |
author2 |
Mascaro,L.H. Machado,S.A.S. Avaca,L.A. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Correia,A.N. Mascaro,L.H. Machado,S.A.S. Avaca,L.A. |
dc.subject.por.fl_str_mv |
formic acid formaldehyde palladium amorphous metallic alloys electrocatalytic oxidation |
topic |
formic acid formaldehyde palladium amorphous metallic alloys electrocatalytic oxidation |
description |
The electrocatalytic oxidation of formic acid and formaldehyde on Pd and on amorphous Pd(Si) was studied by cyclic voltammetry and the results compared with the literature for similar systems. The oxidation of HCOOH on Pd occurs through direct catalytic dehydrogenation via (:C(OH)2)ads while on Pd(Si) this intermediate does not appear to be formed. This is a consequence of the presence of inert Si on the surface that diminishes the probability of adjacent free sites. At high HCOOH concentrations, that intermediate undergoes dehydration on the Pd surface and COads oxidation peak is observed. For HCHO, the oxidation mechanism on both electrode materials appears similar to that previously proposed for Pt. However, the oxides formed on the amorphous Pd(Si) alloy are more reactive than those on Pd thus affecting the overall kinetics of the process for both organic molecules, a fact revealed by the increase in anodic currents observed in the voltammograms. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-12-01 |
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=S0103-50531999000600010 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531999000600010 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50531999000600010 |
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 |
Journal of the Brazilian Chemical Society v.10 n.6 1999 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318163815301120 |