Johnson Matthey has developed a four-way emissions control technology for on-road vehicles to cut NOx, carbon dioxide (CO), hydrocarbons (HC) and particulate matter. The SCRT System has been verified by the EPA, according to the company.

“We are the first manufacturer to market a verified 70% NOx retrofit,” said Marty Lassen, director of commercial development and marketing. “This is further confirmation that Johnson Matthey’s technologies remain among the best choices for improving air quality.”

The system is applicable to 1994-2002 model-year engines, and reduces NOx emissions by 70% and cuts CO, HC and PM emissions by more than 90%, the company said.

Johnson Matthey created the system by combining a urea-based SCR system and a CRT particulate filter.

Lassen expects the SCRT system to gain CARB approval later this year or early in 2011. Approval for use on model year 2003-2006 engines is expected later this year.

The company is running more than 50 test units in California and Texas, with results showing NOx emissions reductions as much as 84%. Test units include both EGR and non-EGR engines.

“The experience gained from these demonstration units and from over 250 SCRT systems being installed via grants from the EPA’s Emerging Technology program, will give the market confidence in the SCRT system’s performance and durability,” Lassen said.