Mechanism of CO oxidation reaction on O-covered Pd(111) surfaces studied with fast x-ray photoelectron spectroscopy: Change of reaction path accompanying phase transition of O domains
(2006) In Journal of Chemical Physics 124(22).- Abstract
- We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (< 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction... (More)
- We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (< 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction proceeds uniformly over the islands in the p(2x1) phase. (Less)
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https://lup.lub.lu.se/record/406034
- author
- Nakai, I ; Kondoh, H ; Shimada, T ; Resta, Andrea LU ; Andersen, Jesper N LU and Ohta, T
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Chemical Physics
- volume
- 124
- issue
- 22
- article number
- 224712
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- wos:000238279800054
- scopus:33745124351
- ISSN
- 0021-9606
- DOI
- 10.1063/1.2205856
- language
- English
- LU publication?
- yes
- id
- 22545e81-5d66-4e07-b2fc-5850ed58745f (old id 406034)
- date added to LUP
- 2016-04-01 12:34:57
- date last changed
- 2022-04-13 20:55:35
@article{22545e81-5d66-4e07-b2fc-5850ed58745f, abstract = {{We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (< 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction proceeds uniformly over the islands in the p(2x1) phase.}}, author = {{Nakai, I and Kondoh, H and Shimada, T and Resta, Andrea and Andersen, Jesper N and Ohta, T}}, issn = {{0021-9606}}, language = {{eng}}, number = {{22}}, publisher = {{American Institute of Physics (AIP)}}, series = {{Journal of Chemical Physics}}, title = {{Mechanism of CO oxidation reaction on O-covered Pd(111) surfaces studied with fast x-ray photoelectron spectroscopy: Change of reaction path accompanying phase transition of O domains}}, url = {{http://dx.doi.org/10.1063/1.2205856}}, doi = {{10.1063/1.2205856}}, volume = {{124}}, year = {{2006}}, }