Marine SCR technology: Airless vs air-assisted dosing

Caterpillar has designed and optimized our U.S. EPA Tier 4 Final and IMO Tier III Marine solutions with Selective Catalytic Reduction (SCR) technology. This solution enables Caterpillar to deliver our critical customer requirements, such as the proven reliability and durability of our engines, fully integrated solutions, and lowest total cost of ownership, all while ensuring regulatory compliance.

While all Cat Marine solutions leverage SCR technology, engine platforms differ in how the Diesel Exhaust Fluid (DEF) is delivered to the Clean Emissions Module (CEM). This discussion will focus on the DEF injection aspect of the SCR system, while discussing the reasons Caterpillar has selected different injection technologies for our various engine platforms.