Catalyzed_Diesel_Exhaust_Fluid (IMAGE) Southwest Research Institute Caption Cat-DEF™ technology is a catalyst- and surfactant-modified diesel exhaust fluid solution developed by Southwest Research Institute. Pictured is a diesel exhaust system with urea injector and static mixer used for deposit testing. Cat-DEF™ technology can help automotive manufacturers meet emissions requirements and can be used on older and current diesel engines. Credit SwRI Usage Restrictions Images/videos may be used by the media and the public for educational and informational purposes only License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.