L. Keith Woo, Iowa State University (IMAGE) Iowa State University Caption L. Keith Woo's hunt for green catalysts has led him to experiment with iron porphyrins. Here he's holding a model of an iron porphyrin compound in his Iowa State University research lab. Credit Photo by Bob Elbert/Iowa State University 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.