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California ARB extends verifications of Johnson Matthey, Huss filters

24 February 2012

The California Air Resources Board (ARB) extended the verifications for two diesel particulate filter (DPF) systems:

The Johnson Matthey CRT+ verification for use on stationary emergency/standby generators was extended to include stationary prime generators. The filter is a Level 3+ device (≥ 85% PM emission reduction) applicable to Tier 1 through Tier 3 engines without exhaust gas recirculation (EGR) that were originally certified to a PM emission level of 0.20 g/bhp-hr or less.

The CRT+ is a passively regenerated filter composed of an oxidation catalyst and a wall-flow monolith. The engines must achieve an exhaust gas temperature of 240°C or above for at least 40% of the operating time, and a NOx/PM ratio ≥ 15 at above 300°C and ≥ 20 at below 300°C.

The Huss FS-MK verification has been extended to cover engines with EGR systems. The FS-MK filter is now verified as a Level 3+ device (≥ 85% PM emission reduction) for onroad, heavy-duty diesel engines of all model years up through and including 2006. The Huss FS-MK filter utilizes a ceramic wall-flow monolith and a diesel fuel burner for regeneration.

Both DPF systems meet the ARB 2009 NO2 emission limit of not more than a 20% increase over the baseline.

Source: California ARB