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Ecocat catalysts tests synthesis - Presentation contents. Catalyst test preparation Test protocols Results of equivalence ratio sensitivity Results of light-off tests Conclusions of the catalyst evaluation phase. Catalyst test preparation. Prototype catalysts to be tested.
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Ecocat catalysts tests synthesis - Presentation contents
Prototype catalysts to be tested
Volume = 1.47 L
Catalysts were aged with RAH (Rapid Aging Hot) protocol by Ecocat
Testprotocols
Variations of equivalence ratio
The objective is to determine the best equivalence ratio regarding the conversion trade-off for HC, CO and NOx and the equivalence ratio sensitivity
Steady state condition on the 3000 rpm - 7 bar of BMEP with G20 fuel, exhaust flow = 110 kg/h, T inlet catalyst = 500 °C, GHSV = 166 000 h-1
Light-off tests
The catalyst is warmed-up from 100 °C to 500 °C on the same operating point 3000 rpm – 7 bar, with the optimal equivalence ratio determined above.
Light-off temperatures at different conversion rates were computed for each species
Max CO conversion = 88%
Max NOx conversion = 85%
Equivalence ratio sensitivity
Catalyst #23207 (120 g/ft3, Pd:Rh = 23:1 )
1
Catalyst #23208
120 g/ft3, Pd:Rh = 11:1
Catalyst #23209
200 g/ft3, Pd:Rh = 19:1
2
3
4
5
Catalyst #23211
250 g/ft3,
Pd only
Catalyst #23210
200 g/ft3, Pd:Rh = 39:1
Catalyst #23207 (120 g/ft3, Pd:Rh = 23:1 )
Catalyst #23208
120 g/ft3, Pd:Rh = 11:1
Catalyst #23209
200 g/ft3, Pd:Rh = 19:1
2
3
4
5
Catalyst #23211
250 g/ft3,
Pd only
Catalyst #23210
200 g/ft3, Pd:Rh = 39:1
Conclusions of the catalyst evaluation phase
Equivalence ratio sensitivity tests
In steady state conditions (T inlet catalyst = 500 °C, GHSV = 166 000 h-1), the prototype #23210 (200 g/ft3 ; Pd:Rh = 39:1) presents the largest equivalence ratio range. Maximum HC conversion efficiency is 80% at 1.001 (slightly rich mixture), while maximum CO and NOx conversion efficiency are 90%.
Light-off tests
In light-off tests conditions, the prototypes #23210 (200 g/ft3 ; Pd:Rh = 39:1) and #23211 (250 g/ft3 ; Pd only) display the lowest light-off temperatures.
Regarding the cost difference, the #23210 reference could be selected for the next phases.
