Catalytic CO Oxidation by O2 Mediated with Single Gold Atom Doped Titanium Oxide Cluster Anions AuTi2 O4-6.
Si-Dun WangJiao-Jiao ChenXiao-Na LiTong-Mei MaSheng-Gui HePublished in: Chemphyschem : a European journal of chemical physics and physical chemistry (2020)
Gas-phase studies on catalytic CO oxidation by O2 mediated with gold-containing heteronuclear metal oxide clusters are vital to obtain the structure-reactivity relationship of supported gold catalysts, while it is challenging to trigger the reactivity of clusters with closed-shell electronic structure in O2 activation. Herein, we identified that CO oxidation by O2 can be catalyzed by the AuTi2 O4-6 - clusters, among which AuTi2 O4 - with closed-shell electronic structure can effectively activate O2 . The reactions were characterized by mass spectrometry and quantum chemical calculations. Theoretical calculations showed that in the initial stage of O2 activation, the Ti2 O4 moiety in AuTi2 O4 - contributes dominantly to activate O2 into superoxide (O2 - ⋅) without participation of the Au atom. In subsequent steps, the intimate charge transfer interaction between Au and the Ti2 O4 moiety drives the direct dissociation of the O2 - ⋅ unit.
Keyphrases
- molecular dynamics
- electron transfer
- visible light
- hydrogen peroxide
- density functional theory
- mass spectrometry
- sensitive detection
- silver nanoparticles
- molecular dynamics simulations
- monte carlo
- highly efficient
- liquid chromatography
- physical activity
- high resolution
- ionic liquid
- room temperature
- transition metal