Selective Catalytic Reduction (SCR)
SCR systems reduce nitrogen oxides (NOx) by injecting a urea-based fluid into the exhaust stream and passing it through a catalyst.
Where They’re Used
Medium- to large high-horsepower heavy-duty engines
Power Generation packages
Applications facing strict emissions requirements
Benefits
Highly effective at meeting the latest NOx standards
Efficient performance even under high-load or continuous-duty operation
Flexible system layouts to fit tighter packaging environments
When SCR is Needed
To Meet Emissions Regulations: Required when local, national, or permit conditions limit NOx emissions.
For Prime or Emergency Generators: Especially for engines with long run houses or in regulated areas such as hospitals, airports, or data centers.
When Integrated with DOC or DPF: SCR controls NOx but does not reduce CO or HC; pairing with a DOC or DPF ensures full compliance.
Typical NOx Reduction
Up to 99%
