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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Theoretical Clarification of the Coexistence of Cl Effects on Au/TiO2: The Interaction between Au Clusters and the TiO2 Surface, and the Aggregation of Au Clusters on the TiO2 Surface
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Theoretical Clarification of the Coexistence of Cl Effects on Au/TiO2: The Interaction between Au Clusters and the TiO2 Surface, and the Aggregation of Au Clusters on the TiO2 Surface

机译:Au / TiO2对CL效应共存的理论澄清:Au簇与TiO2表面之间的相互作用,以及Au簇对TiO2表面的聚集

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摘要

Interactions between nanosized Au cluster models (Au rods, ribbons, and film) and rutile TiO2 (110) modeled surfaces (stoichiometric: sTiO(2), reduced: rTiO(2), and Cl-adsorbed: Cl-rTiO(2)) were determined using density functional theory. The Au-Au bonds are weakened and the Au-Ti bonds are strengthened because the oxygen defect sites in rTiO(2) donate electrons to the nanosized Au models. These interactions suppress the aggregation of the nanosized Au models on the rTiO(2) surface. However, Cl atoms are more strongly adsorbed at the oxygen defect site of rTiO(2) than Au. The amount of transferred electrons from Cl-rTiO(2) to the nanosized Au models is smaller than that of rTiO(2). Notably, the Au/Cl-rTiO(2) interactions are smaller than the Au/sTiO(2) interactions in two-and three-dimensional Au clusters. Thus, Cl atom adsorption onto the oxygen defect site decreases the Au/TiO2 interaction, and the aggregation of the nanosized Au models easily proceeds on Cl-rTiO(2). Hence, the Cl atom adsorption onto the oxygen defect site of the TiO2 surface can be assumed as a reason for the residual Cl enhancement of Au aggregation on the TiO2 surface during Au/TiO2 catalyst preparation.
机译:纳米AU簇模型(Au棒,带和膜)和金红石TiO2(110)模型表面之间的相互作用(化学计量:stiO(2),减少:RtiO(2),和Cl-吸附:Cl-RtiO(2))使用密度泛函理论确定。 Au-Au键削弱,并且加强了Au-Ti键,因为RTIO(2)中的氧缺陷位点捐赠给纳米型AU模型。这些相互作用抑制了RTIO(2)表面上纳米化AU模型的聚集。然而,Cl原子在RTIO(2)的氧缺陷位点比au更强烈地吸附。从Cl-RtiO(2)到纳米Au模型的转移电子的量小于RTIO(2)的量。值得注意的是,Au / Cl-RtiO(2)相互作用小于双和三维Au簇中的Au / stiO(2)相互作用。因此,Cl原子吸附到氧缺陷部位上降低了Au / TiO2的相互作用,并且纳米化Au模型的聚集在CL-RTIO(2)上容易进行。因此,可以假设Cl原子吸附到TiO 2表面的氧缺陷部位上,作为Au / TiO 2催化剂制剂在TiO 2表面上的Au聚集的残留Cl增强的原因。

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