Johnson Matthey receives California verification for CCRT filter

16 February 2005

The California ARB has verified the Johnson Matthey CCRT™ particulate filter system for 1994 to 2004 model year on-road diesel engines operating on ultra low sulfur diesel fuel. The engines must be 4-stroke, turbocharged, and originally certified in California to the 0.1 g/bhp-hr particulate matter (PM) emission standard.

The CCRT™ particulate filter achieves an 85% or greater (Level 3) reduction in PM emissions. The CCRT™ particulate filter requires that an exhaust gas temperature of 210°C is reached over at least 40% of the duty cycle. Specific conditions of the CCRT™ filter approval may be found in the ARB’s Executive Order and attachment.

The CCRT filter—the abbreviation stands for Catalyzed CRT—includes an upstream NO₂ catalyst and a catalyzed particulate filter. Thus, it combines the regeneration mechanisms found in the CRT filter (which includes an NO₂ catalyst and uncatalyzed filter) and in catalyzed filters, allowing for regeneration at lower exhaust temperatures.

Last year, the CCRT filter was verified by the EPA.

Source: California ARB