Vol.31-1 Review
Theoretical study on reaction analysis of Ru/TiO2 catalyst based on density functional theory (DFT): CO2 molecule in a bent form
T. Shimazakia) S. Akamarub) T. Abeb), M. Kuboa)
a)Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
6-6-11 Aoba, Aramaki, Aoba-ku, Sendai 980-8579
b)Hydrogen Isotope Research Center, University of Toyama
3190 Gofuku, Toyama 930-8555
Abstract
The Ru/TiO2 catalyst holds great promise as a key material for artificial conversion of CO2
to CH4 through several hydrogenation elementary reactions. In this study, we examined the bent
structure of CO2 molecules on the Ru(0001) surface and Ru-nano-clusters to investigate the
Ru/TiO2 catalytic reaction, based on the density functional theory (DFT) at the generalized gradient
approximation (GGA) level under the periodic boundary condition. The bent structure of CO2 can trigger
a series of hydrogenation reactions leading to the formation of CH4, and this structure can be observed
not only on the Ru (0001) surface and the Ru nano-particles on the TiO2(101) surface but also on the
homogeneous Ru complex catalyst. These findings suggest that the bending of the CO2 molecule on Ru
metal is a key process to activate the stable CO2 molecule.