[2Dp01-08] Advancement of experimental techniques for surface analysis using synchrotron radiation and its applications: Synchrotron Radiation Surface Science Division's Session

[2Dp08] Low-temperature hydrogenation of CO₂ on the Pd/Cu(111) single atom alloy catalyst studied by AP-XPS

*Wataru Osada¹, Fumihiko Ozaki¹, YoungHyun Choi¹, Masafumi Horio¹, Shunsuke Tanaka¹, Kozo Mukai¹, Takanori Koitaya², Susumu Yamamoto^3,4, Iwao Matsuda¹, Jun Yoshinobu¹ (1. The Institute for Solid State Physics, The University of Tokyo, 2. Department of Chemistry, Graduate school of Science, Kyoto University, 3. International Center for Synchrotron Radiation Innovation Smart, Tohoku University, 4. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University)

The surface chemistry of CO₂ and H₂ on the Pd/Cu single atom alloy catalyst (SAAC) was investigated using ambient-pressure X-ray photoelectron spectroscopy. The SAAC was prepared by vapor-deposition of Pd onto Cu(111), and the coverage was estimated to be ~0.01 ML. When CO₂ was introduced onto the surface, carbonate and atomic oxygen species were observed, indicating the disproportion and dissociation of CO₂. Adding H₂ resulted in a decrease in carbonate and the formation of formate and methoxy species. The present results indicate that CO₂ was hydrogenated into formate via carbonate and further converted into methoxy species on the prepared Pd/Cu(111) surface, where the reaction temperatures were below 380 K. Thus, the Pd/Cu SAAC could be a promised catalyst for CO₂ hydrogenation into methanol.