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Current as of October 02, 2022 | Updated by FindLaw Staff
(a) Oven characteristics. The oven used for thermally stressing the test catalyst must be capable of maintaining a temperature of 500 ± 5 °C and 1000 ± 10 °C.
(b) Evaluation gas composition.
(1) A synthetic exhaust gas mixture is used for evaluating the effect of thermal stress on catalyst conversion efficiency.
(2) The synthetic exhaust gas mixture must have the following composition:
Volume |
Parts per |
|
---|---|---|
Constituent |
percent |
million |
Carbon Monoxide1 |
1 |
․․․․․․․․․․ |
Oxygen |
1.3 |
․․․․․․․․․․ |
Carbon Dioxide |
9 |
․․․․․․․․․․ |
Water Vapor |
10 |
․․․․․․․․․․ |
Sulfur Dioxide |
․․․․․․․․․․ |
20 |
Oxides of Nitrogen |
․․․․․․․․․․ |
280 |
Hydrogen |
․․․․․․․․․․ |
3500 |
․․․․․․․․․․ |
4000 |
|
Nitrogen=Balance |
․․․․․․․․․․ |
․․․․․․․․․․ |
1 Alternatively, the carbon monoxide and hydrocarbon proportions of the mixture may be changed to 1.2% and 4650 ppm, respectively (using on of these alternative concentrations requires that the other be used simultaneously).
2 Propylene/propane ratio=2/1.
Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.91.329 Catalyst thermal stress test - last updated October 02, 2022 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-91-329/
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