About: XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina

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About: XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.apsusc.2011.09.025
Description	Alumina-supported mixed bimetallic Rh-V thin films, with the overall thickness of 0.8 ML, were prepared under the ultrahigh vacuum (UHV) conditions and characterized with respect to their electronic and CO adsorption properties. X-ray photoelectron spectroscopy (XPS) was utilized to characterize electronic changes accompanying bimetallic Rh-V interaction and interaction between metal and polycrystalline gamma-Al(2)O(3) substrate. The chemisorption properties were probed by temperature-programmed desorption spectroscopy (TPD) of CO molecules. The electronic and chemisorption properties of the mixed layers were compared with pure Rh and V layers grown on the same gamma-Al(2)O(3) substrate and with a model bimetallic Rh-V system prepared by V deposition on a polycrystalline Rh foil. By varying the preparation conditions, we observed a strong dependence of the studied properties on the position of the V atoms. The presence of V atoms on the surface led to a fast deactivation, while vanadium presented under the surface resulted in a weakening of CO-metal surface bond, a change in the proportion of the adsorption side species, and an increase of CO dissociation. (C) 2011 Elsevier B. V. All rights reserved. Alumina-supported mixed bimetallic Rh-V thin films, with the overall thickness of 0.8 ML, were prepared under the ultrahigh vacuum (UHV) conditions and characterized with respect to their electronic and CO adsorption properties. X-ray photoelectron spectroscopy (XPS) was utilized to characterize electronic changes accompanying bimetallic Rh-V interaction and interaction between metal and polycrystalline gamma-Al(2)O(3) substrate. The chemisorption properties were probed by temperature-programmed desorption spectroscopy (TPD) of CO molecules. The electronic and chemisorption properties of the mixed layers were compared with pure Rh and V layers grown on the same gamma-Al(2)O(3) substrate and with a model bimetallic Rh-V system prepared by V deposition on a polycrystalline Rh foil. By varying the preparation conditions, we observed a strong dependence of the studied properties on the position of the V atoms. The presence of V atoms on the surface led to a fast deactivation, while vanadium presented under the surface resulted in a weakening of CO-metal surface bond, a change in the proportion of the adsorption side species, and an increase of CO dissociation. (C) 2011 Elsevier B. V. All rights reserved. (en)
Title	XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina (en)
skos:prefLabel	XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina XPS and TPD investigation of CO adsorption on mixed Rh-V layers supported by gamma-alumina (en)
skos:notation	RIV/00216208:11320/11:10108201!RIV12-GA0-11320___
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(GD202/09/H041), S, Z(MSM0021620834)
http://linked.open...iv/cisloPeriodika	2
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Píš, Igor Matolín, Vladimír Nehasil, Václav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	241975
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10108201
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Carbon monoxide; Vanadium; Rhodium; Temperature programmed desorption; X-ray photoelectron spectroscopy; Model catalyst (en)
http://linked.open.../riv/klicoveSlovo	Model catalyst Rhodium Temperature programmed desorption X-ray photoelectron spectroscopy Vanadium Carbon monoxide
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[AD49EA0F99B1]
http://linked.open...i/riv/nazevZdroje	Applied Surface Science
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Physics of nanostructures
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	258
http://linked.open...iv/tvurceVysledku	Matolín, Vladimír Píš, Igor Nehasil, Václav
http://linked.open...ain/vavai/riv/wos	000296525800042
http://linked.open...n/vavai/riv/zamer	Condensed Matter Physics – New Materials and Technologies
issn	0169-4332
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.apsusc.2011.09.025
http://localhost/t...ganizacniJednotka	11320

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