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US EPA Verification Details

Johnson Matthey: Catalyzed Continuously Regenerating Technology (CCRT)

Verification Letter (PDF, 2 pages, 77K) (May 2004)

Temperature Adjustment Approval Letter (PDF, 2 pages, 156K) (June 2005)

* - Baseline assumes an unmodified engine running on regular 2D (<500 ppm sulfur) fuel.
Note: The reductions are based on the installation of retrofits to engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.

The following operating criteria must be met in order for appropriately retrofitted engines to achieve the above emissions reductions:

1. The engine exhaust temperature must be at least 210 degrees C for approximately 40 percent of the duty cycle. (As there may be significant variations from application to application, Johnson Matthey will review actual vehicle operating conditions and perform temperature data-logging prior to retrofitting an engine with their CCRT filter system to ensure compatibility.)

2. The engine’s exhaust must produce a NOx/PM ratio of at least 8, with an optimum approaching 20. Johnson Matthey will make an assessment of the suitability of candidate engines, based upon the applicable emission standards or emission test data.

3. The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer;

4. Johnson Matthey must install a backpressure monitor and high pressure indicator light on all vehicles equipped with a CCRT.

5. The engine must be operated with a fuel that contains a sulfur content of no more than 30 ppm.

Johnson Matthey has indicated that there is a negligible (approximately 1%) fuel economy penalty with the use of this product.

** This product has been verified by CARB to give minimum 85% reductions in PM, CO and HC emissions. CARB also includes additional model years in its verification of Johnson Matthey's products.

The Environmental Protection Agency's (EPA's) Voluntary Diesel Retrofit Program signed a Memorandum of Agreement (MOA) [ 200KB PDF ] with the State of California Air Resources Board (ARB) for the Coordination and Reciprocity in Diesel Retrofit Device Verification. The MOA establishes reciprocity in verifications of hardware or device-based retrofits. See our CARB page for more details.

Johnson Matthey: Continuously Regenerating Technology (CRT)

Verification Letter (PDF, 2 pages, 77K) (November 2000)

Temperature Adjustment Approval Letter (PDF, 2pages, 156K) (June 2005)

* - Baseline assumes an unmodified engine running on regular 2D (<500 ppm sulfur) fuel.
NOTE: This verification applies to highway engines only.
The reductions are based on the installation of retrofits to engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.

The following operating criteria are required to be met when retrofitting highway engines with the CRT:

1. The engine exhaust temperature must be at least 275 degrees C for approximately 40 to 50 percent of the duty cycle. (As there may be significant variations from application to application, Johnson Matthey has indicated that they will review actual vehicle operating conditions and perform temperature data-logging prior to retrofitting a vehicle with their PM filter system to ensure compatibility.)

2. The engine’s exhaust must produce a NOx PM ratio of at least 8, with an optimum approaching 20. (Johnson Matthey has indicated they will make an assessment of the suitability of candidate engines, probably based upon the applicable emission standards or emission test data. Based on discussions with Johnson Matthey, it is our understanding that one can generally expect a heavy duty diesel engine in proper operating condition to maintain an acceptable Nox/PM ratio over its operating life.)

3. The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer;

4. Johnson Matthey installs a backpressure monitor and high pressure indicator light on all vehicles equipped with a CRT.

The engine must be operated with a fuel that contains a sulfur content of no more than 30 ppm max.

N.B. This product has been verified by CARB to give minimum 85% reductions in PM, CO and HC emissions.

The Environmental Protection Agency's (EPA's) Voluntary Diesel Retrofit Program signed a Memorandum of Agreement (MOA) [ 200KB PDF ] with the State of California Air Resources Board (ARB) for the Coordination and Reciprocity in Diesel Retrofit Device Verification. The MOA establishes reciprocity in verifications of hardware or device-based retrofits.

Johnson Matthey: CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter

Original Verification Letter (PDF, 2 pages, 67K) (Auguest 2004)

Extension Verification Letter (PDF, 2 pages, 68K) (January 2005)

* - Baseline assumes an unmodified engine running on regular 2D (<500 ppm sulfur) fuel.
NOTE: This verification applies to highway engines only.
The reductions are based on the installation of retrofits to engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.

The following operating criteria are required to be met when retrofitting highway engines with the CEM™ or DCC™:

1. The engine exhaust temperature must achieve at least 150 degrees C during its duty cycle.

2. The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.

The engine must be operated with a fuel that contains a sulfur content of no more than 500 ppm.

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