Near Ambient Pressure XPS Investigation of CO Oxidation Over Pd3Au(100)
(2017) In Topics in Catalysis 60(17-18). p.1439-1448- 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].
(Less)
- author
- Strømsheim, Marie D. ; Knudsen, Jan LU ; Farstad, Mari Helene ; Sørvik, Linn ; Guo, Xiaoyang ; Venvik, Hilde J. and Borg, Anne
- organization
- publishing date
- 2017-11
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- CO oxidation, Hysteresis, Near ambient X-ray photoelectron spectroscopy, PdAu(100), Quadrupole mass spectrometry
- in
- Topics in Catalysis
- volume
- 60
- issue
- 17-18
- pages
- 1439 - 1448
- publisher
- Springer
- external identifiers
-
- wos:000413848700017
- scopus:85020112201
- 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
- 2024-10-14 08:42:01
@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}}, keywords = {{CO oxidation; Hysteresis; Near ambient X-ray photoelectron spectroscopy; PdAu(100); Quadrupole mass spectrometry}}, language = {{eng}}, number = {{17-18}}, pages = {{1439--1448}}, publisher = {{Springer}}, 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}}, doi = {{10.1007/s11244-017-0831-z}}, volume = {{60}}, year = {{2017}}, }