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- Title
NO<sub>2</sub> inhibits the catalytic reaction of NO and O<sub>2</sub> over Pt.
- Authors
Mulla, S. S.; Chen, N.; Delgass, W. N.; Epling, W. S.; Ribeiro, F. H.
- Abstract
The rate equation for the overall reaction of NO and O2 over Pt/Al2O3 was determined to ber=kf[NO] 1.05±0.08[O2]1.03±0.08[NO2]0.92±0.07(1-ß), withkf as the forward rate constant, ß=([NO2]/K[NO][O2]1/2), andKas the equilibrium constant for the overall reaction. An apparent activation energy of 82 kJ mol-1 ± 9 kJ mol-1 was observed. The inhibition by the product NO2 makes it imperative to include the influence of NO2 concentration in any analysis of the kinetics of this reaction. The reaction mechanism that fits our observed orders consists of the equilibrated dissociation of NO2 to produce a surface mostly covered by oxygen, thereby inhibiting the equilibrium adsorption of NO, and the non-dissociative adsorption of O2, which is the proposed rate determining step.
- Subjects
CHEMICAL reactions; NITRIC oxide; CATALYSIS; ADSORPTION (Chemistry); CHEMICAL equilibrium; CHEMICAL inhibitors
- Publication
Catalysis Letters, 2005, Vol 100, Issue 3/4, p267
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-004-3466-1