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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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slide1

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
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Catalyst test preparation

Prototype catalysts to be tested

Volume = 1.47 L

Catalysts were aged with RAH (Rapid Aging Hot) protocol by Ecocat

ecocat catalysts tests
Ecocat Catalysts tests

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

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Maximum HC conversion = 55% at 1.003

Max CO conversion = 88%

Max NOx conversion = 85%

Equivalence ratio sensitivity

Catalyst #23207 (120 g/ft3, Pd:Rh = 23:1 )

1

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Equivalence ratio sensitivity

Catalyst #23208

120 g/ft3, Pd:Rh = 11:1

Catalyst #23209

200 g/ft3, Pd:Rh = 19:1

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3

4

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Catalyst #23211

250 g/ft3,

Pd only

Catalyst #23210

200 g/ft3, Pd:Rh = 39:1

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Equivalence ratio sensitivity summary

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Equivalence ratio sensitivity summary

Conversion efficiency for optimal equivalence ratio

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Light-off tests

Catalyst #23207 (120 g/ft3, Pd:Rh = 23:1 )

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Light-off tests

Catalyst #23208

120 g/ft3, Pd:Rh = 11:1

Catalyst #23209

200 g/ft3, Pd:Rh = 19:1

2

3

4

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Catalyst #23211

250 g/ft3,

Pd only

Catalyst #23210

200 g/ft3, Pd:Rh = 39:1

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Light-off tests summary

HC conversion

CO conversion

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NOx conversion

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Light-off tests summary

Maximum efficiency during light-off tests

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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.