Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

ABSTRACT: The effect of silicon oxide surface segregation on the locally-resolved kinetics of the CO oxidation reaction on individual grains of a polycrystalline Pd foil was studied in situ by PEEM, MS and XPS. The silicon oxide formation induced by Si-impurity segregation at oxidizing conditions, w...

Descripción completa

Detalles Bibliográficos
Autores principales: Vogel, D., Budinska, Z., Spiel, C., Schlögl, R., Suchorski, Y., Rupprechter, G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2013
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3584672/
https://www.ncbi.nlm.nih.gov/pubmed/23482699
http://dx.doi.org/10.1007/s10562-012-0955-5
_version_ 1782261055254167552
author Vogel, D.
Budinska, Z.
Spiel, C.
Schlögl, R.
Suchorski, Y.
Rupprechter, G.
author_facet Vogel, D.
Budinska, Z.
Spiel, C.
Schlögl, R.
Suchorski, Y.
Rupprechter, G.
author_sort Vogel, D.
collection PubMed
description ABSTRACT: The effect of silicon oxide surface segregation on the locally-resolved kinetics of the CO oxidation reaction on individual grains of a polycrystalline Pd foil was studied in situ by PEEM, MS and XPS. The silicon oxide formation induced by Si-impurity segregation at oxidizing conditions, was monitored by XPS and its impact on the global and local (spatially resolved) kinetics of the CO oxidation was determined by MS and PEEM. The results reveal a drastic inhibiting effect of silicon oxide on the Pd reactivity towards CO oxidation, manifested both in the collapse of the global CO(2) formation rate and in the modified local reactive properties of individual Pd micrograins. The presence of adsorbed oxygen on the Pd surface effectively enhances the silicon segregation to the Pd surface. GRAPHICAL ABSTRACT: [Image: see text]
format Online
Article
Text
id pubmed-3584672
institution National Center for Biotechnology Information
language English
publishDate 2013
publisher Springer US
record_format MEDLINE/PubMed
spelling pubmed-35846722013-03-07 Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study Vogel, D. Budinska, Z. Spiel, C. Schlögl, R. Suchorski, Y. Rupprechter, G. Catal Letters Article ABSTRACT: The effect of silicon oxide surface segregation on the locally-resolved kinetics of the CO oxidation reaction on individual grains of a polycrystalline Pd foil was studied in situ by PEEM, MS and XPS. The silicon oxide formation induced by Si-impurity segregation at oxidizing conditions, was monitored by XPS and its impact on the global and local (spatially resolved) kinetics of the CO oxidation was determined by MS and PEEM. The results reveal a drastic inhibiting effect of silicon oxide on the Pd reactivity towards CO oxidation, manifested both in the collapse of the global CO(2) formation rate and in the modified local reactive properties of individual Pd micrograins. The presence of adsorbed oxygen on the Pd surface effectively enhances the silicon segregation to the Pd surface. GRAPHICAL ABSTRACT: [Image: see text] Springer US 2013-01-08 2013 /pmc/articles/PMC3584672/ /pubmed/23482699 http://dx.doi.org/10.1007/s10562-012-0955-5 Text en © The Author(s) 2013 https://creativecommons.org/licenses/by/2.0/ Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
spellingShingle Article
Vogel, D.
Budinska, Z.
Spiel, C.
Schlögl, R.
Suchorski, Y.
Rupprechter, G.
Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title_full Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title_fullStr Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title_full_unstemmed Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title_short Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study
title_sort silicon oxide surface segregation in co oxidation on pd: an in situ peem, ms and xps study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3584672/
https://www.ncbi.nlm.nih.gov/pubmed/23482699
http://dx.doi.org/10.1007/s10562-012-0955-5
work_keys_str_mv AT vogeld siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy
AT budinskaz siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy
AT spielc siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy
AT schloglr siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy
AT suchorskiy siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy
AT rupprechterg siliconoxidesurfacesegregationincooxidationonpdaninsitupeemmsandxpsstudy

Ejemplares similares