Study of the "Fast SCR"-like mechanism of H2-assisted SCR of NOx with ammonia over Ag/Al2O3
Journal article, 2012
It is shown that Ag/Al2O3 is a unique catalytic system for H-2-assisted selective catalytic reduction of NOx by NH3 (NH3-SCR) with both Ag and alumina being necessary components of the catalyst. The ability of Ag/Al2O3 and pure Al2O3 to catalyse SCR of mixtures of NO and NO2 by ammonia is demonstrated, the surface species occurring discussed, and a "Fast SCR"-like mechanism of the process is proposed. The possibility of catalyst surface blocking by adsorbed NOx and the influence of hydrogen on desorption of NOx were evaluated by FTIR and OFT calculations.
selective catalytic-reduction
Alumina
gamma-alumina
Fast SCR
adsorption
NOx SCR
o-2
Ag/Al2O3
silver-alumina catalyst
hydrocarbons
h-2
nitric-oxide
lean conditions
hydrogen storage
FTIR
Author
D. E. Doronkin
Danmarks Tekniske Universitet
Sebastian Fogel
Haldor Topsoe A/S
Stefanie Tamm
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Louise Olsson
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
T. S. Khan
Danmarks Tekniske Universitet
T. Bligaard
Stanford Linear Accelerator Center
Pär Gabrielsson
Haldor Topsoe A/S
S. Dahl
Danmarks Tekniske Universitet
Applied Catalysis B: Environmental
0926-3373 (ISSN) 1873-3883 (eISSN)
Vol. 113 228-236Areas of Advance
Transport
Materials Science
Subject Categories (SSIF 2011)
Chemical Sciences
DOI
10.1016/j.apcatb.2011.11.042