March 5, 2024


Epicurean computer & technology

SwRI technology reduces heavy-duty diesel emi



picture: CAT-DEF™ engineering is a catalyst- and surfactant-modified diesel exhaust fluid resolution developed by Southwest Investigation Institute. SwRI engineers applied this diesel exhaust procedure with urea injector and static mixer to perform deposit tests. Cat-DEF engineering can enable automotive producers meet emissions specifications and can be included to more mature and latest diesel engines.
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Credit rating: Southwest Research Institute

SAN ANTONIO — May 4, 2022 — Southwest Research Institute (SwRI®) demonstrated the success of its patented and award-winning CAT-DEF™ technological innovation during the WCX™ World Congress Knowledge in Detroit, which took place April 5-7. The internally funded advancement successfully decreased weighty-responsibility diesel motor nitrogen oxide (NOx) emissions to meet the California Air Assets Board (CARB) 2027 standards.

CAT-DEF, which stands for Catalyzed Diesel Exhaust Fluid, is an SwRI-formulated catalyst- and surfactant-modified diesel exhaust fluid (DEF) answer. Today’s diesel engines use selective catalytic reduction (SCR), an highly developed emissions regulate technique, to abate NOx emissions. DEF is injected into the exhaust stream and ideally decomposes to kind ammonia, which reacts with NOx on the SCR catalyst to kind N2 and H2O.

Though the recent method is relatively economical at temperatures higher than 250°C, at temperatures beneath 250°C, urea-derived deposits type inside of the aftertreatment method. These deposits severely limit lower-temperature NOx conversion and improve fuel intake as superior-temperature motor functions are required to take away the deposits.

SwRI’s novel technological innovation decreases NOx and carbon dioxide emissions for diesel engines by considerably decreasing unwanted deposit development in exhaust programs.

“Although DEF engineering has been used for more than a ten years, the optimum emissions manage efficiencies could in no way be recognized due to DEF’s tendency to build potentially unsafe deposits in the exhaust method, notably when the motor is operated at lower masses and temperatures,” said Dr. Charles E. Roberts Jr., director of SwRI’s Industrial Motor vehicle Methods Office. “A mix of surface area-lively brokers and heterogenous catalysts blended into CAT-DEF decreases deposits by 90% with prospective reductions up to 98%.”


Employing interior funding, SwRI engineers studied the technology’s success for decreasing NOx emissions at the new benchmarks established by CARB—known for enacting stricter specifications than the Environmental Security Agency—through a head-to-head comparison of diesel engines operated with and without the need of CAT-DEF.

“We demonstrated that applying CAT-DEF allowed an engine to meet or exceed future CARB 2027 NOx needs, though using standard DEF did not meet the new conventional,” claimed SwRI Study Scientist Dr. Grant Seuser, a person of CAT-DEF’s principal investigators, who together with his fellow scientists shared their results throughout a session on technique integration and toughness at WCX. “Our conclusions display that DEF can now be utilized around a a great deal broader selection of engine procedure, lowering in general NOx emissions.”

SwRI’s CAT-DEF technological know-how is at the moment accessible to license. The novel innovation is backwards appropriate and can be utilised in present engines as a deposit reduction resolution. For future purposes, which will be essential to meet more stringent regulatory demands, the award-profitable CAT-DEF remedy competes with larger-expense engine components modifications currently currently being regarded by the diesel engine marketplace and DEF companies.

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