Abstract
This paper deals with the elementary kinetic mean field modelling of the catalytic NOx reduction by H2 on Pt/WO3/ZrO2 under oxygen-rich conditions. Pt/WO3/ZrO2 exhibits outstanding deNOx activity at low exhaust temperatures as well as improved N2 selectivity as compared with classical Pt catalysts. The kinetic model was developed based upon a postulated reaction mechanism as well as kinetic examinations and implied a network of 48 reaction steps described by Arrhenius-based rate expressions. Kinetic parameters were taken from literature and were elucidated by fitting calculations, while pre-exponential factors of adsorption were estimated from kinetic gas theory. For validation, catalytic studies were simulated and compared with experiments and thermodynamic consistency was proven. As a result of the kinetic model, the formation of OH surface species was identified as the rate determining step of H2 oxidation, while the reduction of NO predominately occurs by dissociation of chemisorbed NO.
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