3-D Surface (IMAGE) Vienna University of Technology Caption This is a 3-D-picture and a model drawing of a Pd-ZrO2 catalyst. The essential interface/borderline is colored green in the model. Credit TU Wien Usage Restrictions None License Licensed 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.