Vanadium oxide nanostructures on Rh(111): Promotion effect of CO adsorption and oxidation
(2005) In Surface Science 580(1-3). p.122-136- Abstract
- The adsorption of CO and the reaction of CO with pre-adsorbed oxygen at room temperature has been studied on the (2 x 1)O-Rh(1 1 1) surface and on vanadium oxide-Rh(1 1 1) "inverse model catalyst" surfaces using scanning tunnelling microscopy (STM) and core-level photoemission with synchrotron radiation. Two types of structurally well-defined model catalyst V3O9-Rh(1 1 1) surfaces have been prepared, which consist of large (mean size of similar to 50 nm, type I model catalyst) and small (mean size < 15 nm, type II model catalyst) two-dimensional oxide islands and bare Rh areas in between; the latter are covered by chemisorbed oxygen. Adsorption of CO on the oxygen pre-covered (2 x 1)O-Rh(1 1 1) surface leads to fast CO uptake in on-top... (More)
- The adsorption of CO and the reaction of CO with pre-adsorbed oxygen at room temperature has been studied on the (2 x 1)O-Rh(1 1 1) surface and on vanadium oxide-Rh(1 1 1) "inverse model catalyst" surfaces using scanning tunnelling microscopy (STM) and core-level photoemission with synchrotron radiation. Two types of structurally well-defined model catalyst V3O9-Rh(1 1 1) surfaces have been prepared, which consist of large (mean size of similar to 50 nm, type I model catalyst) and small (mean size < 15 nm, type II model catalyst) two-dimensional oxide islands and bare Rh areas in between; the latter are covered by chemisorbed oxygen. Adsorption of CO on the oxygen pre-covered (2 x 1)O-Rh(1 1 1) surface leads to fast CO uptake in on-top sites and to the removal of half (0.25 ML) of the initial oxygen coverage by an oxidation clean-off reaction and as a result to the formation of a coadsorbed (2 x 2)-O + CO phase. Further removal of the adsorbed O with CO is kinetically hindered at room temperature. A similar kinetic behaviour has been found also for the CO adsorption and oxidation reaction on the type I "inverse model catalyst" surface. In contrast, on the type II inverse catalyst surface, containing small V-oxide islands, the rate of removal of the chemisorbed oxygen is significantly enhanced. In addition, a reduction of the V-oxide islands at their perimeter by CO has been observed, which is suggested to be the reason for the promotion of the CO oxidation reaction near the metal-oxide phase boundary. (Less)
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https://lup.lub.lu.se/record/244595
- author
- Schoiswohl, J ; Eck, S ; Ramsey, MG ; Andersen, Jesper N LU ; Surnev, S and Netzer, FP
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- rhodium, catalysis, chemisorption, carbon monoxide, spectroscopy, scanning tunneling microscopy, synchrotron radiation photoelectron, vanadium oxide
- in
- Surface Science
- volume
- 580
- issue
- 1-3
- pages
- 122 - 136
- publisher
- Elsevier
- external identifiers
-
- wos:000228544100015
- scopus:15944384241
- ISSN
- 0039-6028
- DOI
- 10.1016/j.susc.2005.02.023
- language
- English
- LU publication?
- yes
- id
- cbfa5029-cc87-4cb8-9a63-7bbc5d6dbeae (old id 244595)
- date added to LUP
- 2016-04-01 15:41:51
- date last changed
- 2022-01-28 06:38:29
@article{cbfa5029-cc87-4cb8-9a63-7bbc5d6dbeae, abstract = {{The adsorption of CO and the reaction of CO with pre-adsorbed oxygen at room temperature has been studied on the (2 x 1)O-Rh(1 1 1) surface and on vanadium oxide-Rh(1 1 1) "inverse model catalyst" surfaces using scanning tunnelling microscopy (STM) and core-level photoemission with synchrotron radiation. Two types of structurally well-defined model catalyst V3O9-Rh(1 1 1) surfaces have been prepared, which consist of large (mean size of similar to 50 nm, type I model catalyst) and small (mean size < 15 nm, type II model catalyst) two-dimensional oxide islands and bare Rh areas in between; the latter are covered by chemisorbed oxygen. Adsorption of CO on the oxygen pre-covered (2 x 1)O-Rh(1 1 1) surface leads to fast CO uptake in on-top sites and to the removal of half (0.25 ML) of the initial oxygen coverage by an oxidation clean-off reaction and as a result to the formation of a coadsorbed (2 x 2)-O + CO phase. Further removal of the adsorbed O with CO is kinetically hindered at room temperature. A similar kinetic behaviour has been found also for the CO adsorption and oxidation reaction on the type I "inverse model catalyst" surface. In contrast, on the type II inverse catalyst surface, containing small V-oxide islands, the rate of removal of the chemisorbed oxygen is significantly enhanced. In addition, a reduction of the V-oxide islands at their perimeter by CO has been observed, which is suggested to be the reason for the promotion of the CO oxidation reaction near the metal-oxide phase boundary.}}, author = {{Schoiswohl, J and Eck, S and Ramsey, MG and Andersen, Jesper N and Surnev, S and Netzer, FP}}, issn = {{0039-6028}}, keywords = {{rhodium; catalysis; chemisorption; carbon monoxide; spectroscopy; scanning tunneling microscopy; synchrotron radiation photoelectron; vanadium oxide}}, language = {{eng}}, number = {{1-3}}, pages = {{122--136}}, publisher = {{Elsevier}}, series = {{Surface Science}}, title = {{Vanadium oxide nanostructures on Rh(111): Promotion effect of CO adsorption and oxidation}}, url = {{http://dx.doi.org/10.1016/j.susc.2005.02.023}}, doi = {{10.1016/j.susc.2005.02.023}}, volume = {{580}}, year = {{2005}}, }