A Low Temperature Pathway Operating the Reduction of Stored Nitrates in Pt-Ba/Al2O3 Lean NOx Trap Systems
Date Published: 2006-04-03
Paper Number:2006-01-1368
DOI: 10.4271/2006-01-1368
Citation:
Nova, I., Castoldi, L., Lietti, L., Tronconi, E. et al., "A Low Temperature Pathway Operating the Reduction of Stored Nitrates in Pt-Ba/Al2O3 Lean NOx Trap Systems," SAE Technical Paper 2006-01-1368, 2006, doi:10.4271/2006-01-1368.
In this paper the low temperature reduction process of nitrates stored at high temperatures over model Pt-Ba/Al
2
O
3
LNT catalysts using both H
2
and C
3
H
6
is analyzed. The results indicate that over the Pt-Ba/Al
2
O
3
catalyst the reduction of stored NO
x
with both H
2
and C
3
H
6
occurs at temperature below those corresponding to their thermal stability. Accordingly, the reduction process occurs through a Pt-catalyzed surface reaction, which does not involve, as a preliminary step, the thermal decomposition of the adsorbed NO
x
species. The occurrence of such a pathway also requires the co-presence of the storage element and of the noble metal on the same support.
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