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The Effects of CO, H 2 , and C 3 H 6 on the SCR Reactions of an Fe Zeolite SCR Catalyst
Technical Paper
2013-01-1062
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Selective Catalytic Reduction (SCR) catalysts used in Lean
NOx Trap (LNT) - SCR exhaust aftertreatment systems
typically encounter alternating oxidizing and reducing
environments. Reducing conditions occur when diesel fuel is
injected upstream of a reformer catalyst, generating high
concentrations of hydrogen (H₂), carbon monoxide (CO), and
hydrocarbons to deNOx the LNT. In this study, the
functionality of an iron (Fe) zeolite SCR catalyst is explored with
a bench top reactor during steady-state and cyclic transient SCR
operation.
Experiments to characterize the effect of an LNT
deNOx event on SCR operation show that adding H₂ or CO
only slightly changes SCR behavior with the primary contribution
being an enhancement of nitrogen dioxide (NO₂) decomposition into
nitric oxide (NO). Exposure of the catalyst to C₃H₆ (a surrogate
for an actual exhaust HC mixture) leads to a significant decrease
in NOx reduction capabilities of the catalyst. A
degradation mechanism is proposed to account for the decrease in
NOx conversion efficiency, highlighted by reactions
between NO₂ and C₃H₆ to make NO at a rate of similar order of
magnitude as the Fast SCR reaction. This inhibits SCR reactions
when the NO:NOx ratio favors NO, but can increase
NOx conversion when the NO:NOx ratio favors
NO₂.
Ammonia (NH₃) storage is only marginally affected by the
presence of H₂, CO, or C₃H₆; but significant amounts of C₃H₆ can be
stored on the catalyst. Further observation reveals that the
oxidation effects of C₃H₆ are non-negligible and C₃H₆ strongly
influences the oxidation of NH₃. The degradation mechanism includes
seven proposed reactions to model the experimental results of
adding H₂, CO, and C₃H₆ to the SCR feed gas during steady-state and
transient operation.
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Authors
Citation
Smith, M., Depcik, C., Hoard, J., Bohac, S. et al., "The Effects of CO, H2, and C3H6 on the SCR Reactions of an Fe Zeolite SCR Catalyst," SAE Technical Paper 2013-01-1062, 2013, https://doi.org/10.4271/2013-01-1062.Also In
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