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Near Ambient Pressure XPS Investigation of CO Oxidation Over Pd3Au(100)

Strømsheim, Marie D.; Knudsen, Jan LU ; Farstad, Mari Helene; Sørvik, Linn; Guo, Xiaoyang; Venvik, Hilde J. and Borg, Anne (2017) In Topics in Catalysis p.1-10
Abstract

The CO oxidation behavior under excess oxygen and near stoichiometric conditions over the surface of Pd3Au(100) has been studied by combining near-ambient pressure X-ray photoelectron spectroscopy and quadrupole mass spectrometry and compared to Pd(100). During heating and cooling cycles, normal hysteresis in the CO2 production, i.e. with the light-off temperature being higher than the extinction temperature, is observed for both surfaces. On both Pd3Au(100) and Pd(100) the (√5 × √5)R27° surface oxide structure is present during CO2 production under excess oxygen conditions (O2:CO = 10:1), while at near stoichiometric conditions (O2:CO = 1:1) the surfaces are covered with... (More)

The CO oxidation behavior under excess oxygen and near stoichiometric conditions over the surface of Pd3Au(100) has been studied by combining near-ambient pressure X-ray photoelectron spectroscopy and quadrupole mass spectrometry and compared to Pd(100). During heating and cooling cycles, normal hysteresis in the CO2 production, i.e. with the light-off temperature being higher than the extinction temperature, is observed for both surfaces. On both Pd3Au(100) and Pd(100) the (√5 × √5)R27° surface oxide structure is present during CO2 production under excess oxygen conditions (O2:CO = 10:1), while at near stoichiometric conditions (O2:CO = 1:1) the surfaces are covered with atomic oxygen. Au as alloying element hence induces only minor differences in the observed hysteresis and the active phase compared to pure Pd. Alloying with Au thus yields a different behavior compared to Ag, where reversed hysteresis is observed for CO2 production over Pd75Ag25(100) at similar conditions [Fernandes et al., ACS Catal. (2016) 4154].

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
CO oxidation, Hysteresis, Near ambient X-ray photoelectron spectroscopy, PdAu(100), Quadrupole mass spectrometry
in
Topics in Catalysis
pages
10 pages
publisher
Kluwer
external identifiers
  • scopus:85020112201
  • wos:000413848700017
ISSN
1022-5528
DOI
10.1007/s11244-017-0831-z
language
English
LU publication?
yes
id
c7d9f18f-6b9d-4385-9ee2-54a726a2fec9
date added to LUP
2017-06-28 09:12:41
date last changed
2018-01-16 13:20:44
@article{c7d9f18f-6b9d-4385-9ee2-54a726a2fec9,
  abstract     = {<p>The CO oxidation behavior under excess oxygen and near stoichiometric conditions over the surface of Pd<sub>3</sub>Au(100) has been studied by combining near-ambient pressure X-ray photoelectron spectroscopy and quadrupole mass spectrometry and compared to Pd(100). During heating and cooling cycles, normal hysteresis in the CO<sub>2</sub> production, i.e. with the light-off temperature being higher than the extinction temperature, is observed for both surfaces. On both Pd<sub>3</sub>Au(100) and Pd(100) the (√5 × √5)R27° surface oxide structure is present during CO<sub>2</sub> production under excess oxygen conditions (O<sub>2</sub>:CO = 10:1), while at near stoichiometric conditions (O<sub>2</sub>:CO = 1:1) the surfaces are covered with atomic oxygen. Au as alloying element hence induces only minor differences in the observed hysteresis and the active phase compared to pure Pd. Alloying with Au thus yields a different behavior compared to Ag, where reversed hysteresis is observed for CO<sub>2</sub> production over Pd<sub>75</sub>Ag<sub>25</sub>(100) at similar conditions [Fernandes et al., ACS Catal. (2016) 4154].</p>},
  author       = {Strømsheim, Marie D. and Knudsen, Jan and Farstad, Mari Helene and Sørvik, Linn and Guo, Xiaoyang and Venvik, Hilde J. and Borg, Anne},
  issn         = {1022-5528},
  keyword      = {CO oxidation,Hysteresis,Near ambient X-ray photoelectron spectroscopy,PdAu(100),Quadrupole mass spectrometry},
  language     = {eng},
  month        = {05},
  pages        = {1--10},
  publisher    = {Kluwer},
  series       = {Topics in Catalysis},
  title        = {Near Ambient Pressure XPS Investigation of CO Oxidation Over Pd<sub>3</sub>Au(100)},
  url          = {http://dx.doi.org/10.1007/s11244-017-0831-z},
  year         = {2017},
}