A high pressure x-ray photoelectron spectroscopy study of CO oxidation over Rh(100).
(2013) In Journal of Physics: Condensed Matter 26(5).- Abstract
- We have studied the oxidation of CO over Rh(100) using high pressure x-ray photoelectron spectroscopy under CO and O2 pressures ranging from 0.01 to 1 mbar. The results show a very low or no conversion for the CO covered surface found at low temperatures, while the activity rises slightly when the temperature is high enough for some CO to desorb, exposing surface sites for dissociative O2 adsorption. As the temperature is increased further, more CO desorbs and oxygen replaces CO as the dominating species at the surface. At the same time we find a sudden increase in the reactivity, such that all CO that reaches the surface is instantly transformed into CO2. We find that the O coverage in the active state is highly dependent on the total... (More)
- We have studied the oxidation of CO over Rh(100) using high pressure x-ray photoelectron spectroscopy under CO and O2 pressures ranging from 0.01 to 1 mbar. The results show a very low or no conversion for the CO covered surface found at low temperatures, while the activity rises slightly when the temperature is high enough for some CO to desorb, exposing surface sites for dissociative O2 adsorption. As the temperature is increased further, more CO desorbs and oxygen replaces CO as the dominating species at the surface. At the same time we find a sudden increase in the reactivity, such that all CO that reaches the surface is instantly transformed into CO2. We find that the O coverage in the active state is highly dependent on the total pressure and, although we do not detect any presence of a surface oxide as in previous surface x-ray diffraction studies, the highest O coverage indicates that the surface is close to being oxidized. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4223773
- author
- Gustafson, Johan LU ; Blomberg, Sara LU ; Martin, Natalia LU ; Fernandes, V ; Borg, A ; Liu, Z ; Chang, R and Lundgren, Edvin LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physics: Condensed Matter
- volume
- 26
- issue
- 5
- article number
- 055003
- publisher
- IOP Publishing
- external identifiers
-
- pmid:24334623
- wos:000330686200004
- scopus:84892724459
- pmid:24334623
- ISSN
- 1361-648X
- DOI
- 10.1088/0953-8984/26/5/055003
- language
- English
- LU publication?
- yes
- id
- b126ba6d-cc02-4208-ba00-9cda4d28734d (old id 4223773)
- date added to LUP
- 2016-04-01 14:32:41
- date last changed
- 2023-10-30 01:37:47
@article{b126ba6d-cc02-4208-ba00-9cda4d28734d,
abstract = {{We have studied the oxidation of CO over Rh(100) using high pressure x-ray photoelectron spectroscopy under CO and O2 pressures ranging from 0.01 to 1 mbar. The results show a very low or no conversion for the CO covered surface found at low temperatures, while the activity rises slightly when the temperature is high enough for some CO to desorb, exposing surface sites for dissociative O2 adsorption. As the temperature is increased further, more CO desorbs and oxygen replaces CO as the dominating species at the surface. At the same time we find a sudden increase in the reactivity, such that all CO that reaches the surface is instantly transformed into CO2. We find that the O coverage in the active state is highly dependent on the total pressure and, although we do not detect any presence of a surface oxide as in previous surface x-ray diffraction studies, the highest O coverage indicates that the surface is close to being oxidized.}},
author = {{Gustafson, Johan and Blomberg, Sara and Martin, Natalia and Fernandes, V and Borg, A and Liu, Z and Chang, R and Lundgren, Edvin}},
issn = {{1361-648X}},
language = {{eng}},
number = {{5}},
publisher = {{IOP Publishing}},
series = {{Journal of Physics: Condensed Matter}},
title = {{A high pressure x-ray photoelectron spectroscopy study of CO oxidation over Rh(100).}},
url = {{http://dx.doi.org/10.1088/0953-8984/26/5/055003}},
doi = {{10.1088/0953-8984/26/5/055003}},
volume = {{26}},
year = {{2013}},
}