Diesel Exhaust Fluid: Goes Off-Road

摘要

Since 2010, diesel-powered on-highway trucks in North America have been using selective catalytic reduction (SCR) as an exhaust after-treatment technique to control nitrogen-oxide (NOx) emissions. And for the most part, the chemical that makes SCR work, diesel exhaust fluid (DEF), has been handily available at parts stores, truck stops, gas-station chains, and stationary bulk systems in truck-fleet terminals. But for many users of off-road equipment, SCR is new technology, and the logistics of getting DEF to job-bound machines working on remote sites is not as simple as pulling up to the pump at a truck stop.