Freezing Cu as a Noble Metal (IMAGE) Chinese Academy of Sciences Headquarters Caption Freezing Cu as a noble metal like catalyst with oxidization-resistance property facilitates the controlling of selective hydrogenation. This behavior is similar to a warrior with a solid armor resisting the attack on the battlefield. Credit SUN Jian and YU Jiafeng 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.