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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Characterization of CO- and H_2-Adsorbed Au_6Pt-Phosphine Clusters Supported on SiO_2 by EXAFS, TPD, and FTIR
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Characterization of CO- and H_2-Adsorbed Au_6Pt-Phosphine Clusters Supported on SiO_2 by EXAFS, TPD, and FTIR

机译：用EXAFS，TPD和FTIR表征SiO_2负载的CO和H_2吸附的Au_6Pt膦簇

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摘要

The adsorption of CO and H_2 and a SiO_2-supported A_6Pt cluster [(AuPPh_3)_6Pt(PPh_3)](NO_3)_2 (1) has been studied by means of FTIF, TPD, and EXAFS. CO adsorbed on 1/SiO_2 to forms a CO-adduct complex, exhibited an IR band at ca. 1972 cm~(-1). The adsorbed CO was desorbed below 403 K, showing a peak maximum at 363 K in TPD. There was little change in the coordination number of Pt-Au in Pt L_3-edge EXAFS upon CO adsorption, but the coordination number of Au-Au in Au L_3-edge EXAFS slightly increased an the peak ascribed to Pt-(Au)-P in the Pt L_3-edge EXAFS Fourier transform remarkably increased. The increase in the intensity of the Pt-(Au)-P peak was interpreted by the multiple scattering effect owing to the change of Pt-Au-P bond angle. The original EXAFS oscillations at both Pt and Au L_3-edges were regenerated after evacuation of the CO-adsorbed sample for 2 h at 353 K, indicating the recovery of the original cluster structure. This is entirely different from the case of the cluster 1 in solution, where the cluster framework is fragmented by the CO adsorption-desorption process. The adsorption of H_2 on 1/SiO_2 was totally reversible at room temperature; it provided no contribution to the EXAFS oscillation.
机译：利用FTIF，TPD和EXAFS研究了CO和H_2以及SiO_2负载的A_6Pt团簇[（AuPPh_3）_6Pt（PPh_3）]（NO_3）_2（1）的吸附。 CO吸附在1 / SiO_2上以形成CO加合物，并在大约1℃处显示IR带。 1972厘米〜（-1）吸附的CO在403 K以下解吸，在TPD中显示最大峰在363K。 CO吸附后Pt L_3-edge EXAFS中Pt-Au的配位数几乎没有变化，但Au L_3-edge EXAFS中Au-Au的配位数稍微增加了一个归因于Pt-（Au）-P的峰在Pt L_3边缘EXAFS中，傅立叶变换显着增加。 Pt-（Au）-P峰强度的增加是由于Pt-Au-P键角的变化引起的多重散射效应所解释。在353 K下将吸附有CO的样品抽空2 h后，在Pt和Au L_3边缘处的原始EXAFS振荡均得以再生，这表明原始簇结构得以恢复。这与溶液中簇1的情况完全不同，在溶液中簇框架通过CO吸附-解吸过程而破碎。在室温下，H_2在1 / SiO_2上的吸附是完全可逆的。它对EXAFS振荡没有任何贡献。

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