14 September 2002

Brampton, ON-based Catalytic Exhaust Products Limited (CEP) announced that its SXS-B diesel particulate filer was found not to promote the formation of harmful nitrogen dioxide (NO2) emissions in US Mine Safety and Health Administration (MSHA) testing. The model SXS-B diesel particulate filter was used in conjunction with DFX-DPF diesel fuel additives manufactured by Clean Diesel Technologies (CDT). Six out of the eight diesel particulate filters (DPF) tested by MSHA promoted the formation of NO2 in at least 2 test modes over an 8 mode steady state test cycle.

The goal of the MSHA testing was to establish the NO2 increases produced by base metal coatings, precious metal coatings and precious metal fuel additives used in the regeneration of diesel particulate filters. The MSHA diesel regulation for underground coal mines requires that mines retrofit existing engines with emission control devices to meet the diesel particulate standard of 2.5 g/hr which goes into effect for non-permissible equipment on 19 July 2003. MSHA acquired a total of 8 different diesel particulate filters from 6 manufacturers. MSHA found that all of the diesel particulate filters tested, with the exception of the CEP model SXS-B diesel particulate filter and one model of a base metal catalyst filter, increased NO2 emissions to levels that may require a significant increase in ventilation rates. In most cases the change in NO2 ranged from 50% to 600%+ increase in test mode 5 and 6 of the test cycle. All of the DPF systems were tested on a Deutz F6L912W diesel engine over the ISO 8178 8 mode steady state test cycle using diesel fuel with a sulfur content of less than 500 ppm sulfur.

Additional information can be found in the MSHA program information bulletin NO. P02-7.

Source: Catalytic Exhaust Products