Technology reduces heavy-duty diesel emissions to meet stringent CARB 2027 NOx requirements
Cat-DEF Know-how. Credit score: Southwest Analysis Institute

Southwest Analysis Institute (SwRI) demonstrated the effectiveness of its CAT-DEF know-how in the course of the WCX World Congress Expertise in Detroit, which occurred April 5–7. The development efficiently diminished heavy-duty diesel engine nitrogen oxide (NOx) emissions to satisfy the California Air Sources Board (CARB) 2027 requirements.

CAT-DEF, which stands for Catalyzed Diesel Exhaust Fluid, is an SwRI-developed catalyst- and surfactant-modified diesel exhaust fluid (DEF) resolution. Right this moment’s diesel engines use selective catalytic discount (SCR), a sophisticated emissions management system, to abate NOx emissions. DEF is injected into the exhaust stream and ideally decomposes to type ammonia, which reacts with NOx on the SCR catalyst to type N2 and H2O.

Though the present course of is comparatively environment friendly at temperatures better than 250°C, at temperatures beneath 250°C, urea-derived deposits type throughout the aftertreatment system. These deposits severely restrict low-temperature NOx conversion and improve gas consumption as high-temperature engine operations are required to take away the deposits.

SwRI’s novel know-how decreases NOx and carbon dioxide emissions for diesel engines by considerably decreasing undesirable deposit formation in exhaust programs.

“Though DEF know-how has been utilized for greater than a decade, the very best emissions management efficiencies may by no means be realized attributable to DEF’s tendency to create doubtlessly dangerous deposits within the exhaust system, notably when the engine is operated at low hundreds and temperatures,” stated Dr. Charles E. Roberts Jr., director of SwRI’s Business Automobile Programs Division. “A mixture of surface-active brokers and heterogenous catalysts blended into CAT-DEF reduces deposits by 90% with potential reductions as much as 98%.”

SwRI engineers studied the know-how’s effectiveness for decreasing NOx emissions on the new requirements set by CARB—recognized for enacting stricter requirements than the Environmental Safety Company—via a head-to-head comparability of diesel engines operated with and with out CAT-DEF.

“We demonstrated that utilizing CAT-DEF allowed an engine to satisfy or exceed upcoming CARB 2027 NOx necessities, whereas utilizing normal DEF didn’t meet the brand new normal,” stated SwRI Analysis Scientist Dr. Grant Seuser, one in every of CAT-DEF’s principal investigators, who, alongside his fellow researchers, shared the findings throughout a session on system integration and sturdiness at WCX. “Our findings present that DEF can now be utilized over a much wider vary of engine operation, lowering total NOx emissions.”

SwRI’s CAT-DEF know-how is at present out there to license. The novel innovation is backwards-compatible and can be utilized in present engines as a deposit discount resolution. For future purposes, which shall be required to satisfy extra stringent regulatory necessities, the award-winning CAT-DEF resolution competes with higher-cost engine {hardware} modifications at present being thought-about by the diesel engine business and DEF producers.


New Low-Load Cycle targets heavy-duty diesel engine emissions


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Southwest Analysis Institute

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Know-how reduces heavy-duty diesel emissions to satisfy stringent CARB 2027 NOx necessities (2022, Could 6)
retrieved 8 Could 2022
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