title: UHV-FTIRS studies on molecular competitive adsorption: 12CO, 13CO and CO2 on reduced TiO2(110) surfaces.
abstract: Competitive adsorption of prototype molecules such as (12)CO, (13)CO and CO2 at the two typical fivefold coordinated Ti5c(4+) cation sites of reduced rutile TiO2(110) surfaces was studied in a newly designed UHV-FTIR system. The measured binding energies of (12)CO, (13)CO or CO2 adsorbed at two kinds of Ti5c(4+) sites are different. The molecular occupying probability at these sites depends on the binding energy of the adsorbed molecules; while, the molecular exchanging probability at these sites depends on their binding energy difference due to the presence of competitive adsorption. A simple thermodynamic equilibrium model was proposed to qualitatively interpret the adsorption and competitive adsorption mechanisms. These results will contribute to the elucidation of the (photo)catalytic process on TiO2(110) surfaces.
authors.affiliation: School of Physics, National Key Laboratory of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan, Shandong 250100, P. R. China. xumingchun@sdu.edu.cn shishenyan@sdu.edu.cn.
authors.forename: Mingchun
authors.initials: M
authors.lastname: Xu
authors.forename: Yunjun
authors.initials: Y
authors.lastname: Cao
authors.forename: Renbo
authors.initials: R
authors.lastname: Xu
authors.forename: Shujun
authors.initials: S
authors.lastname: Hu
authors.forename: Shishen
authors.initials: S
authors.lastname: Yan