Diesel Issue Resolution Team Action Table
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NO2 emissions from catalyzed ceramic filters-
MSHA has tested six precious metal (platinum) catalyzed filters at its diesel laboratory and has determined that each of them increases the amount of NO2 emitted by one MSHA-approved diesel engine, as compared to the same engine operating under identical test conditions, but without the catalyzed filter. The increase is attributed to the oxidation of nitric oxide (NO) due to the presence of the platinum catalyst. MSHA will continue to test additional filters and release the results to the mining community. MSHA will also evaluate the effect of the use of a fuel catalyst with lightly catalyzed filters on NO2 emissions and the effect of ultra low sulfur diesel fuel on NO2 emissions.

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