Global kinetic modeling of reactions occurring during selective catalytic reduction of NO by NH{sub 3} over vanadia/titania-based catalysts
- Swiss Federal Inst. of Tech., Zurich (Switzerland). Lab. of Technical Chemistry
The global kinetics of the reactions occurring during the selective catalytic reduction (SCR) of NO by NH{sub 3} over vanadia-based commercial DeNO{sub x} catalysts has been studied. The global kinetic model developed accounts for three chemical reaction pathways (Eley-Rideal and Langmuir-Hinshelwood type SCR and ammonia oxidation) occurring in this system and considers the effects of intraparticle diffusion phenomena. The model is applied to describe the global kinetics in the broad temperature range from 140 to 475 C. New insight in the interplay between the processes occurring during SCR has been gained by considering the influence of the concentration of oxygen and water, the weak adsorption of NO at low temperatures (T {le} ca. 350 C), the relevance of the Langmuir-Hinshelwood type SCR at temperatures below ca. 200 C, the occurrence of NH{sub 3} oxidation as a side reaction at temperatures above ca. 300 C, and the role of intraparticle diffusion.
- OSTI ID:
- 321072
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 37, Issue 12; Other Information: PBD: Dec 1998
- Country of Publication:
- United States
- Language:
- English
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