NOx ADSORBER CATALYST
A catalyst and alumina technology, which is applied in the field of lean NOx trapping catalysts and can solve problems such as low efficiency
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Embodiment 1
[0152] Cumulative NO x Pollutant emissions are shown in figure 1 middle. NO at engine output (before catalyst) x Emissions vs. NO after catalyst x The difference between emissions indicates NO removal over the catalyst x amount. From figure 1 As can be seen in the figure, compared to the comparative catalyst 1 without the DOC-lean region, the catalyst 2 containing the lower DOC-lean region has a greater adsorption of NO in the deactivated state. x Ability.
Embodiment 2
[0154] Cumulative CO pollutant emissions are shown in figure 2 middle. The difference between the CO emissions at the engine output (before the catalyst) and the CO emissions after the catalyst indicates the amount of CO removed on the catalyst. From figure 2 It can be seen that Catalyst 2, which contains a DOC-lean lower zone, has a greater ability to convert CO in both the deactivated and activated states, compared to Comparative Catalyst 1, which does not contain a DOC-lean zone.
Embodiment 3
[0156] Cumulative HC pollutant emissions are shown in image 3 middle. The difference between the HC emissions at the engine output (before the catalyst) and the HC emissions after the catalyst indicates the amount of HC removed at the catalyst. From image 3 As can be seen in , Catalyst 2 containing the lower DOC-lean region has a higher ability to convert HC in both the deactivated and activated states compared to Comparative Catalyst 1 without the DOC-lean region.
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Abstract
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