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Reducing NO x in diesel exhausts by SCR technique: Experiments and simulations
Author(s) -
Andersson S. Lennart,
Gabrielsson Pär L. T.,
Odenbrand C. U. Ingemar
Publication year - 1994
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690401115
Subject(s) - desorption , catalysis , selective catalytic reduction , chemistry , diesel fuel , ammonia , kinetic energy , adsorption , honeycomb , activation energy , analytical chemistry (journal) , kinetics , diesel engine , thermodynamics , chemical engineering , materials science , chromatography , composite material , organic chemistry , physics , quantum mechanics , engineering
Abstract Results of experiments are compared to simulations of the performance of V 2 O 5 /γ‐alumina SCR catalyst used to remove nitrogen oxides from diesel exhausts. The kinetic model is based on Eley‐Rideal kinetics. Temperature programmed desorption (TPD) of the ammonia is used to evaluate adsorption/desorption parameters. Stationary experiments on a 3.6‐dm 3 engine with a 4.8‐dm 3 honeycomb catalyst is used to evaluate kinetic rate parameters for the reduction of NO with NH 3 . The desorption activation energy, E a,des , is best fitted as a function of surface coverage yielding E a,des = 240* (I −0.44* θ NH3 0.36 ) kJ/mol. A dynamic test (FTP) with a 12‐dm 3 engine and24.8‐dm3 honeycomb catalyst is done with astoichiometric injection of ammonia. The NO x conversion is 52%, but during the freeway traffic the conversion reached 72%. The prediction of NO x conversion is good, but there are some deviations for temperature and ammonia slip.