Influence of the type of reducing agent (H2, CO, C3H6 and C3H8) on the reduction of stored NOX in a Pt/BaO/Al2O3 model catalyst

In this investigation, a comparative study for a NOx storage catalytic system was performed focusing on the parameters that affect the reduction by using different reductants (H-2, CO, C3H6 and C3H8) and different temperatures (350, 250 and 150 degreesC), for a Pt/BaO/Al2O3 catalyst. Transient experiments show that H-2 and CO are highly efficient reductants compared to C3H6 which is somewhat less efficient. H-2 shows a significant reduction effect at relatively low temperature (150 degreesC) but with a low storage capacity. We find that C3H8 does not show any NOx reduction ability for NOx stored in Pt/BaO/Al2O3 at any of the temperatures. The formation of ammonia and nitrous oxide is also discussed.