3 Way Catalysts (TWC) reduce nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC) in rich-burn natural gas, propane, and other spark-ignition engines, helping stationary engines meet stringent emissions standards, including PZEV and similar regulatory requirements.

Where They’re Used

• Power Generation

• Combined Heat & Power (CHP)

• Gas Compression

• Pumping

• Other industrial applications where compliance, uptime, and predictable operation are critical

Benefits

• Efficient multi-pollutant control without complex aftertreatment stages

• Compact sizing ideal for retrofit projects or tight enclosures

• Lower maintenance needs compared to particulate-based systems

• Consistent performance with engines operating at or near stoichiometric conditions

When a 3 Way Catalyst is Needed

• To Meet Emissions Regulations: Essential when local, national, or permit limits require PZEV-level or low-emission compliance for NOx, CO, and HC.

• For Engines in Regulated Areas: Common for stationary engines in hospitals, data centers, commercial facilities, or sites under EPA, CARB, or local environmental authority oversight.

• For Continuous or Prime Power Operation: Maintains compliance under extended operation, ensuring predictable pollutant reduction.

• When Retrofit or Space Constraints Exist: Compact form factor allows installation in existing enclosures without extensive system modification.

Typical Reductions

• NOx: up to 90-95% (engine and operating condition dependent)

• CO: up to 90%

• HC: up to 90%

Sizes

Available in a range of sizes and configurations, GT Silex 3 Way Catalysts can be tailored to fit unique space, performance, and regulatory requirements. Our engineering teams support customers through integration, housing design, and system packaging to ensure dependable, long-term operation.