Presentation Information
[1C10]Mechanism of CO2 activation in the presence of H2 on Ru(0001) surface
*Yu Murano1, Masafumi Horio1, Yuki Tsujikawa2, Yifu Liu1, Ken-ichi Ozawa3, Hiroshi Kondoh2, Iwao Matsuda1 (1. The Institute for Solid State Physics, The University of Tokyo, 2. Graduate School of Science and Technology, Keio University, 3. High Energy Accelerator Research Organization)
Ruthenium (Ru) is a highly active catalyst for hydrogenation of carbon dioxide (CO2) to methane (CH4) and carbon monoxide (CO), while the actual process of surface reaction has not been resolved yet. In this study, we investigated the chemical states of a Ru(0001) surface under CO2 and hydrogen (H2) gases with ambient-pressure X-ray photoelectron spectroscopy taken measured at synchrotron facilities; Photon Factory and NanoTerasu. In the presence of 0.1 mbar CO2, CO molecules were observed on the Ru(0001) surface at room temperature, which proves the dissociation of CO2 molecules. With increasing the temperature, CO molecules desorbed from the surface, indicating reverse water gas shift reaction. On the other hand, when H2 was introduced onto the surface in advance, CO2 dissociation was inhibited. Based on these observations, we will discuss the chemistry of CO2 dissociation on the surface of Ru.