Modelling of the kinetics of the catalytic soot oxidation on Fe2O3

Authors: Steffen Wagloehner, Sven Kureti

Abstract:
This paper addresses the kinetic modelling of the soot oxidation on a Fe₂O₃ model catalyst. The kinetics was evaluated by temperature programmed oxidation using a packed bed of tight contact mixtures of Fe₂O₃ and soot. The reaction rate was expressed by a global-kinetic approach taken from a previous paper. Some kinetic parameters were determined by a fit to experimental TPO data using a stationary 1-D CSTR model with coupled mass and heat balance. The fitting led to an apparent activation energy of 73 kJ/mol, while the pre-exponential factor was calculated to be 1.6 × 103 m³/(mol s). The kinetic model was validated by simulations and was then implemented into a transient 2-D model of the fixed-bed reactor. This model implied the conservation of mass, heat and momentum and was checked by temperature measurements conducted with an IR camera. Finally, the 2-D model was validated by simulating some TPO investigations. The simulations provide local concentrations of CO₂, O₂ and soot as well as local temperature and gas velocity. Particularly, these results suggest the absence of any drastic gradients of concentration and temperature in the packed bed due to the convection of the gas stream.

Keywords:
Kinetic modelling
Soot oxidation
Fe₂O₃
Model catalyst
Fluid dynamics

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Modelling of the kinetics of the catalytic soot oxidation on Fe2O3

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại