40 CFR 91.329 - Catalyst thermal stress test.
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(a) Oven characteristics. The oven used for termally stressing the test catalyst must be capable of maintaining a temperature of 500 ±5 °C and 1000 ±10 °C.
(1) A synthetic exhaust gas mixture is used for evaluating the effect of thermal stress on catalyst conversion efficiency.
|Constituent||Volumepercent||Parts per million|
|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.|
|Carbon Monoxide 1||1|
|Oxides of Nitrogen||280|
Title 40 published on 2014-07-01
no entries appear in the Federal Register after this date.