[2C09-15] Synchrotron Radiation Surface Science 

4:05 PM - 4:35 PM JST(7:05 AM - 7:35 AM UTC)

[2C13【女子大学院生優秀賞】] Microscopic elucidation of CO₂ hydrogenation on transition metal surfaces and development of the multimodal operando experimental system

*Yu Murano¹ (1. The Institute for Solid State Physics, The University of Tokyo (Japan))

We have used ambient pressure soft X-ray photoelectron spectroscopy (APXPS) to investigate systematically the surface states and the reaction intermediates on Ni(111) and Ru(0001) surfaces in CO₂/H₂ mixtures. Ni is the typical catalyst for CO₂ methanation, while Ru has been attracted as one of the most active catalysts. On the Ni(111) surface, the reaction mechanism has been switched from CO₂ dissociation to H-assisted pathway at 370 K, followed by accumulation of elemental carbon (C*) species above 470 K. On the other hand, Ru(0001) surface showed CO₂ dissociation at 300 K with co-adsorbed phase of CO* at different adsorption sites, leading to the formation of C* species as low as 370 K. The difference of reaction mechanisms can contribute to the unique reactivity of Ru compared to Ni. I will also introduce our next challenge toward multimodal operando experimental system to directly correlate the spectroscopic information with catalytic activity.

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