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Reversed Hysteresis...
Reversed Hysteresis during CO Oxidation over Pd75Ag25(100)
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- Fernandes, V. R. (författare)
- Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology
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- van den Bossche, Maxime, 1989 (författare)
- Chalmers University of Technology
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- Knudsen, Jan (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,MAX IV Laboratory,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Farstad, M. H. (författare)
- Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology
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- Gustafson, Johan (författare)
- Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Venvik, H. J. (författare)
- Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology
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- Grönbeck, Henrik, 1966 (författare)
- Chalmers University of Technology
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- Borg, A. (författare)
- Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Norwegian University of Science and Technology
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(creator_code:org_t)
- 2016-06-02
- 2016
- Engelska.
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Ingår i: ACS Catalysis. - : American Chemical Society (ACS). - 2155-5435. ; 6:7, s. 4154-4161
- Relaterad länk:
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http://dx.doi.org/10...
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https://ntnuopen.ntn...
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https://research.cha...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- CO oxidation over Pd(100) and Pd75Ag25(100) has been investigated by a combination of near-ambient pressure X-ray photoelectron spectroscopy, quadrupole mass spectrometry, density functional theory calculations, and microkinetic modeling. For both surfaces, hysteresis is observed in the CO2 formation during the heating and cooling cycles. Whereas normal hysteresis with light-off temperature higher than extinction temperature is present for Pd(100), reversed hysteresis is observed for Pd75Ag25(100). The reversed hysteresis can be explained by dynamic changes in the surface composition. At the beginning of the heating ramp, the surface is rich in palladium, which gives a CO coverage that poisons the surface until the desorption rate becomes sufficiently high. The thermodynamic preference for an Ag-rich surface in the absence of adsorbates promotes diffusion of Ag from the bulk to the surface as CO desorbs. During the cooling ramp, an appreciable surface coverage is reached at temperatures too low for efficient diffusion of Ag back into the bulk. The high concentration of Ag in the surface leads to a high extinction temperature and, consequently, the reversed hysteresis.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- pressure conditions
- hysteresis
- ray photoelectron-spectroscopy
- DFT
- carbon-monoxide oxidation
- Pd75Ag25(100)
- bimetallic catalysts
- ultrahigh-vacuum
- surface
- microkinetic modeling
- segregation
- ambient
- pd(111) surfaces
- density-functional calculations
- CO oxidation
- Pd(100)
- adsorption
- hydrogen
- pt-group metals
- NAP-XPS
- Chemistry
- CO oxidation
- DFT
- hysteresis
- microkinetic modeling
- NAP-XPS
- Pd(100)
- PdAg(100)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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