Catalyst rafts (IMAGE) Washington State University Caption Catalyst “rafts” of palladium (Pd) oxide that are held together with single atoms of platinum are effective at cleaning up emissions from natural gas engines. Credit By Cortland Johnson, PNNL. Usage Restrictions None 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.