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Following the thermal and chemical activation of supported Au clusters using X-ray absorption spectroscopy

机译:在使用X射线吸收光谱的支持的AU簇的热和化学活化之后

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摘要

Al2O3-supported Au-25(SC8H9)(18) clusters with various Au loadings were thermally and chemically treated in order to determine the most efficient method towards the removal of thiolate stabilizers while avoiding unwanted increases in cluster size due to agglomeration and sintering. X-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) were used to investigate samples before and after thermal and chemical treatments. Results show that while 250 degrees C thermal treatment leads to nearly complete removal of thiolate stabilizers, it comes with a concomitant increase in cluster size as sintering becomes problematic. In contrast, chemical reduction treatments using borohydride reducing agents does not lead to significant growth in cluster size, but only allows for partial thiolate removal. These results are important as many researchers look to determine optimal activation conditions for ultra-monodisperse Au and bimetallic clusters for use as model catalysts without destroying their original structures.
机译:Al2O3支持的Au-25(SC8H9)(18)具有各种Au载荷的簇进行热和化学处理,以确定朝向除去硫醇酸盐稳定剂的最有效方法,同时避免由于聚集和烧结引起的簇大小的增加。 X射线吸收光谱(XAS)和透射电子显微镜(TEM)用于在热和化学处理之前和之后研究样品。结果表明,虽然250摄氏度热处理导致硫醇酸酯稳定剂几乎完全除去,但由于烧结变得有问题,它伴随着簇尺寸的增加。相反,使用硼氢化硼还原剂的化学还原处理不会导致簇大小的显着生长,但仅允许部分硫醇除去。这些结果很重要,因为许多研究人员希望确定用于Ultra-monodeperse Au和Bimetallic簇的最佳活化条件,以用作模型催化剂而不破坏其原始结构。

著录项

  • 来源
    《RSC Advances》 |2016年第67期|共6页
  • 作者

    Shivhare A.; Scott R. W. J.;

  • 作者单位

    Univ Saskatchewan Dept Chem 110 Sci Pl Saskatoon SK S7N 5C9 Canada;

    Univ Saskatchewan Dept Chem 110 Sci Pl Saskatoon SK S7N 5C9 Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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