Influence of the reducing agent for lean NOx reduction over Cu-ZSM-5
Journal article, 2011
A range of ethers, alcohols and alkanes were compared as reducing agents for NOx over a Cu-ZSM-5 lean NOx catalyst. The nature of the reducing agent was found to determine the degree of NOx reduction. Methanol and DME were virtually inactive as reductants over this catalyst, while higher ethers and alcohols showed high NOx conversion. A detailed study was performed to investigate the differences. Among the studied variables, the chemical structure of the reductant was found to be especially important. Despite having a lower reducing capacity than DME, ethylene glycol was active for NOx reduction. It is concluded that a C-C bond in the reducing agent is required for lean NOx reduction over Cu-ZSM-5. The absence of this bond in DME and methanol explains their low activity for NOx reduction over this catalyst.
Alternative fuel
Reducing agent
Ether
Dimethyl
Zeolite
Cu-ZSM-5
Hydrocarbon-SCR
engine
selective catalytic-reduction
excess oxygen
nitrogen-oxides
Alcohol
dimethyl ether
ether
NOx reduction
exhaust-gas
zeolites
nitric-oxide
zsm-5 catalysts
exchanged
Alkane
promoted alumina catalysts
hydrocarbon specificity
Author
Sara U Erkfeldt
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Anders Palmqvist
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Martin Petersson
Volvo Group
Applied Catalysis B: Environmental
0926-3373 (ISSN) 1873-3883 (eISSN)
Vol. 102 3-4 547-554Subject Categories
Chemical Sciences
DOI
10.1016/j.apcatb.2010.12.037