Details
| Original language | English |
|---|---|
| Pages (from-to) | 15382-15393 |
| Number of pages | 12 |
| Journal | Journal of Physical Chemistry C |
| Volume | 112 |
| Issue number | 39 |
| Early online date | 4 Sept 2008 |
| Publication status | Published - 2 Oct 2008 |
Abstract
The NH3 + O2 reaction on a Pt(533) surface has been studied in the 10-4 mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing ratios O2/NH3 and varying total pressure. In heating/cooling cycles hysteresis of ∼50-100 K width occur. Adsorbed NOad already decomposes at T > 350 K. Under stationary conditions, no adsorbed NO could be detected. At no time during the experiments were Pt bulk oxides formed. A shift in the surface core level component of the Pt 4f spectrum by more than 0.5 eV toward higher binding energy is attributed to Pt atoms of the (100) step edges which are coordinated to more than one oxygen atom similar to the model proposed by Wang et al. Phys. Rev. Lett. 2005, 95, 256102.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 112, No. 39, 02.10.2008, p. 15382-15393.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - In Situ X-ray Photoelectron Spectroscopy of Catalytic Ammonia Oxidation over a Pt(533)Surface
AU - Günther, S.
AU - Scheibe, A.
AU - Bluhm, H.
AU - Haevecker, M.
AU - Kleimenov, E.
AU - Knop-Gericke, A.
AU - Schlögl, R.
AU - Imbihl, R.
N1 - Funding Information: This work was supported by the DFGunder the priority program 1091 “Bridging the gap between idealand real systems in heterogeneous catalysis”. The BESSY staffis gratefully acknowledged for the continuous support of theinsituXPS measurements
PY - 2008/10/2
Y1 - 2008/10/2
N2 - The NH3 + O2 reaction on a Pt(533) surface has been studied in the 10-4 mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing ratios O2/NH3 and varying total pressure. In heating/cooling cycles hysteresis of ∼50-100 K width occur. Adsorbed NOad already decomposes at T > 350 K. Under stationary conditions, no adsorbed NO could be detected. At no time during the experiments were Pt bulk oxides formed. A shift in the surface core level component of the Pt 4f spectrum by more than 0.5 eV toward higher binding energy is attributed to Pt atoms of the (100) step edges which are coordinated to more than one oxygen atom similar to the model proposed by Wang et al. Phys. Rev. Lett. 2005, 95, 256102.
AB - The NH3 + O2 reaction on a Pt(533) surface has been studied in the 10-4 mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing ratios O2/NH3 and varying total pressure. In heating/cooling cycles hysteresis of ∼50-100 K width occur. Adsorbed NOad already decomposes at T > 350 K. Under stationary conditions, no adsorbed NO could be detected. At no time during the experiments were Pt bulk oxides formed. A shift in the surface core level component of the Pt 4f spectrum by more than 0.5 eV toward higher binding energy is attributed to Pt atoms of the (100) step edges which are coordinated to more than one oxygen atom similar to the model proposed by Wang et al. Phys. Rev. Lett. 2005, 95, 256102.
UR - http://www.scopus.com/inward/record.url?scp=54249109492&partnerID=8YFLogxK
U2 - 10.1021/jp803264v
DO - 10.1021/jp803264v
M3 - Article
AN - SCOPUS:54249109492
VL - 112
SP - 15382
EP - 15393
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 39
ER -