CAT-DEF™ (IMAGE) Southwest Research Institute Caption CAT-DEF™ technology is a catalyst- and surfactant-modified diesel exhaust fluid solution developed by Southwest Research Institute. SwRI engineers used this diesel exhaust system with urea injector and static mixer to conduct deposit testing. Cat-DEF technology can help automotive manufacturers meet emissions requirements and can be added to older and current diesel engines. Credit Southwest Research Institute Usage Restrictions Images/Videos may be used by 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.