The US Environmental Protection Agency (EPA) has verified Johnson Matthey’s innovative SCRT system as the first four-way emission control technology for on-road vehicles.

The SCRT system is a combination of a CRT (continuously regenerating technology) system and an SCR (selective catalytic reduction) system. 

Applicable to 1994-2002 model year engines, the SCRT system is verified to reduce NOx emissions by 70 per cent and cut CO, HC and PM emissions by more than 90 per cent.

As the global pioneer and leader in controlling emissions from mobile and stationary sources, Johnson Matthey combined two of its highly successful catalytic technologies to develop the SCRT system. They include a urea-based SCR system, which has been used successfully for some 30 years on a wide range of stationary engines and other industrial applications, and the patented CRT particulate filter, which was introduced in the 1990s and was also the first particulate filter to be EPA/CARB (California Air Resources Board) verified.

Verification ‘significant’
Marty Lassen, Johnson Matthey’s director of commercial development and marketing, said: “We are the first manufacturer to market a verified 70 per cent NOx retrofit.”

He added that once the SCRT system gains CARB verification later this year or in early 2011, it will be the only retrofit technology to significantly help meet the CARB private fleet rule requirements. It will also provide states that are in ozone non-attainment another tool for control of NOx from on-road mobile sources. And once the SCRT system is verified for 2003-2006 model year engines, expected later this year, Johnson Matthey will provide a solution for NOx control on millions of engines.