Details
| Original language | English |
|---|---|
| Pages (from-to) | 16-21 |
| Number of pages | 6 |
| Journal | Catalysis letters |
| Volume | 142 |
| Issue number | 1 |
| Publication status | Published - 30 Oct 2011 |
Abstract
The kinetics of ammonia oxidation with oxygen over a Rh(110) surface were studied in the pressure range 10 -5-10 -4mbar. Nitrogen was found to be the preferred product at low partial pressures ratios P 02 : P NH3, while the NO pathway was favored with oxygen rich gas mixtures and at high temperature. The reactive sticking coefficient of O 2 reaches up to 0.05 under steady state conditions. Pronounced hysteresis effects in the reaction rates were found in T-cycling experiments. Sustained oscillations in the reaction rates occurred under isothermal conditions at T = 620 K at a total pressure of 4 × 10 -5 mbar.
Keywords
- Kinetic oscillations, NH + O reaction, Rhodium, Single crystal
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
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In: Catalysis letters, Vol. 142, No. 1, 30.10.2011, p. 16-21.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The O 2 + NH 3 reaction over Rh(110)
T2 - Steady state kinetics and oscillatory behavior
AU - Rafti, Matías
AU - Lovis, Florian
AU - Imbihl, Ronald
N1 - Funding Information: Acknowledgments Matías Rafti gratefully acknowledges CONI-CET-UNLP (Argentina) and DAAD (Germany) for providing with scholarships and financial assistance. Florian Lovis is grateful to the Zentrum für Festkörperchemie und Neue Materialen (ZFM) and the state of Niedersachsen for providing a Georg Christoph Lichtenberg scholarship.
PY - 2011/10/30
Y1 - 2011/10/30
N2 - The kinetics of ammonia oxidation with oxygen over a Rh(110) surface were studied in the pressure range 10 -5-10 -4mbar. Nitrogen was found to be the preferred product at low partial pressures ratios P 02 : P NH3, while the NO pathway was favored with oxygen rich gas mixtures and at high temperature. The reactive sticking coefficient of O 2 reaches up to 0.05 under steady state conditions. Pronounced hysteresis effects in the reaction rates were found in T-cycling experiments. Sustained oscillations in the reaction rates occurred under isothermal conditions at T = 620 K at a total pressure of 4 × 10 -5 mbar.
AB - The kinetics of ammonia oxidation with oxygen over a Rh(110) surface were studied in the pressure range 10 -5-10 -4mbar. Nitrogen was found to be the preferred product at low partial pressures ratios P 02 : P NH3, while the NO pathway was favored with oxygen rich gas mixtures and at high temperature. The reactive sticking coefficient of O 2 reaches up to 0.05 under steady state conditions. Pronounced hysteresis effects in the reaction rates were found in T-cycling experiments. Sustained oscillations in the reaction rates occurred under isothermal conditions at T = 620 K at a total pressure of 4 × 10 -5 mbar.
KW - Kinetic oscillations
KW - NH + O reaction
KW - Rhodium
KW - Single crystal
UR - http://www.scopus.com/inward/record.url?scp=84856598457&partnerID=8YFLogxK
U2 - 10.1007/s10562-011-0722-z
DO - 10.1007/s10562-011-0722-z
M3 - Article
AN - SCOPUS:84856598457
VL - 142
SP - 16
EP - 21
JO - Catalysis letters
JF - Catalysis letters
SN - 1011-372X
IS - 1
ER -