A kinetic model of the hydrogen assisted selective catalytic reduction of NO with ammonia over Ag/Al2O3
Journal article, 2013
A global kinetic model which describes H2-assisted NH3-SCR over an Ag/Al2O3 monolith catalyst has been developed.
The intention is that the model can be applied for dosing NH3 and H2 to an Ag/Al2O3 catalyst in a real automotive
application as well as contribute to an increased understanding of the reaction mechanism for NH3-SCR. Therefore, the model needs to be simple and accurately predict the conversion of NOx. The reduction of NO is described by a global reaction, with a molar stoichiometry between NO, NH3 and H2 of 1:1:2. Further reactions included in the model are the oxidation of NH3 to N2 and NO, oxidation of H2, and the adsorption and desorption of NH3. The model was fitted to the results of an NH3-TPD experiment, an NH3 oxidation experiment, and a series of H2-assisted NH3-SCR steady-state experiments. The model predicts the conversion of NOx well even during transient experiments.
NH3-SCR
H2
Ag/Al2O3
NOx reduction
global kinetic model
Author
Stefanie Tamm
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Louise Olsson
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Sebastian Fogel
Technical University of Denmark (DTU)
Haldor Topsoe
Pär Gabrielsson
Haldor Topsoe
Magnus Skoglundh
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
AICHE Journal
0001-1541 (ISSN) 1547-5905 (eISSN)
Vol. 59 11 4325-4333Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories
Physical Chemistry
Chemical Process Engineering
Roots
Basic sciences
DOI
10.1002/aic.14170