The kinetics of the oxidation of ammonia on a V2O5/TiO2 SCR catalyst deactivated in an engine rig. Part I. Determination of kinetic parameters by simulation

Yıl 2019, Cilt: 2 Sayı: 4, 211 - 221, 31.12.2019

İngemar Odenbrand

https://doi.org/10.35208/ert.597731

Cited By: 1

Öz

It is shown how the
deactivation of a diesel SCR (Selective Catalytic Reduction) catalyst by
compounds in the exhaust gases influences the kinetics of the catalyst. Results
are given for the fresh (4.56 % V₂O₅/TiO₂)
catalyst and the ones used in the rig for 890 h and 2299 h. The reactions of
700 ppm NH₃ and 2 % O₂ in Helium yielded N₂, N₂O,
and NO at increasing temperatures. Simulations were performed with COMSOL
Multiphysics using a 3-D model of the catalyst system. The experimental values
of the products N₂, N₂O, and NO were very nicely fitted
by the kinetic model used. All three ammonia oxidation reaction rates were of
the first order in the concentration of NH₃. A preliminary study
using non-isothermal conditions showed the maximal temperature increase to be
0.15 K. Thus, further simulations were done with an isothermal model. The
deactivation reduces the pre-exponential factors and the activation energies
for the formation of N₂, N₂O, and NO. The formation of N₂
is not substantially influenced by deactivation. The changes in the kinetics of
the catalytic NH₃ oxidation by deactivation is reported for the
first time in the present study.

Anahtar Kelimeler

Oxidation of ammonia, poisoning and kinetics, Vanadia SCR diesel catalysts

Destekleyen Kurum

Department of Chemical Engineering

Kaynakça

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