Integrated SCRT technology for US EPA Tier 4 diesel engine compliance

Reduce NOx, PM, CO, HC and noise from stationary diesel engines to comply with Tier 4 or more stringent air pollution requirements

Over the last 20 years, the US EPA and local air boards have reduced the allowable emissions of nitrogen oxides (NOx), carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM) or soot from stationary diesel engines by implementing increasingly more stringent air emission standards, which are known as Tier levels. The current US Federal Tier level is Tier 4, although some local air boards impose even more stringent emission requirements. Johnson Matthey’s SCRT® system integrates Selective Catalytic Reduction (SCR)  with passive diesel particulate filter technology (CRT®) to remove NOx and PM from diesel exhaust while simultaneously oxidizing CO and HC. The SCRT system can reduce the emissions of some Tier 1 and most Tier 2 and Tier 3 diesel engines to comply with the US EPA Tier 4, or even more stringent standards.

Criteria Pollutant Reduction Efficiency
NOx > 90%
PM > 85%
CO > 90%
VOC > 70%