The adsorption and dissociation of CO₂ on TiO₂(110), CeO_x/TiO₂(110) and Pt/CeO_x/TiO₂(110) surfaces has been examined using Ambient Pressure X-ray Photoelectron Spectroscopy (AP-XPS). The substrates under study exhibited different degrees of complexity which were tested for the binding of the adsorbate and the cleavage of C-O bonds. The surfaces were prepared by depositing CeO_x (0.1 ML) onto TiO₂(110) to form a mixed oxide support, onto which Pt nanoparticles (0.2 ML) were deposited. This configuration yields a complex set of interfaces between metal and oxides and we have systematically titrated the active role of each component (Pt 4f, Ce 3d and Ti 2p regions) and the arising surface intermediates (C 1 s and O 1 s regions). CO₂ barely bonds to stoichiometric TiO₂(110). It heals oxygen vacancies of this oxide surface (CO_2,gas → CO_gas + O_a) and does not form stable carbonates. A stable carbonate was seen upon adsorption of CO₂ on CeO_x/TiO₂(110) and on this type of substrate the adsorbate also removed O vacancies leading to the oxidation of Ti³⁺and Ce³⁺ sites. Pt nanoparticles dispersed on CeO_x/TiO₂(110) were highly effective for the binding and dissociation of CO₂, with the formation of CO₃, CO, C and CH_x species on the Pt/CeO_x/TiO₂(110) system. The results of theoretical calculations based on density-functional theory (DFT) show that Pt/CeO_x/TiO₂(110) binds CO₂ much stronger than surfaces of bulk platinum {(111), (100), (110)} or other late transition metals. On a Pt-CeO_x interface, the molecule adsorbs with a bent configuration (~130° O-C-O bond angle) and with a substantial elongation (~ 0.1 Å) of the C-O bonds, facilitating its transformation into high value chemicals.

使用环境压力X射线光电子能谱（AP-XPS）检查了TiO ₂（110），CeO _x / TiO ₂（110）和Pt / CeO _x / TiO ₂（110）表面上CO ₂的吸附和解离。。所研究的底物表现出不同程度的复杂性，并测试了被吸附物的结合和CO键的断裂。通过将CeO _x（0.1 ML）沉积到TiO ₂上来制备表面（110）形成混合氧化物载体，其上沉积有Pt纳米颗粒（0.2 ML）。这种配置在金属和氧化物之间产生了一组复杂的界面，我们已经系统地滴定了每种组分（Pt 4f，Ce 3d和Ti 2p区域）和出现的表面中间体（C 1 s和O 1 s区域）的活性作用。CO ₂几乎不与化学计量的TiO ₂（110）结合。它可以治愈该氧化物表面的氧空位（CO _2，气体 →CO_气体 + O _a），并且不会形成稳定的碳酸盐。在CeO _x / TiO ₂上吸附CO _2时，观察到稳定的碳酸盐（110）并且在这种类型的基底上，被吸附物还去除了O空位，从而导致Ti ³⁺和Ce ³⁺位点的氧化。分散在CeO _x / TiO ₂（110）上的Pt纳米颗粒对CO ₂的结合和解离非常有效，并且在Pt / CeO _x / TiO ₂（110）上形成了CO ₃，CO，C和CH _x物种。系统。基于密度泛函理论（DFT）的理论计算结果表明，Pt / CeO _x / TiO ₂（110）与CO ₂结合比块状铂{（111），（100），（110）}或其他后期过渡金属的表面强得多。在Pt-CeO _x界面上，分子以弯曲构型（〜130°OCO键角）和CO键的相当大的伸长率（〜0.1Å）吸附，从而促进了其向高价值化学物质的转化。