The global kinetics of the reactions occurring during the selective catalytic reduction (SCR) of
NO by NH3 over vanadia-based commercial DeNO
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 ≤ ca. 200 °C), the
decrease of the NH3 coverage at high temperatures (T ≤ ca. 350 °C), the relevance of the
Langmuir−Hinshelwood type SCR at temperatures below ca. 200 °C, the occurrence of NH3
oxidation as a side reaction at temperatures above ca. 300 °C, and the role of intraparticle
diffusion.
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