首页> 外文会议>ACS Symposium Series 921; American Chemical Society National Meeting; 20040328-0401; Anaheim,CA(US) >Cyclic Voltammetry as a Potential Predictive Method for Supported Nanocrystalline Gold Catalysts for Oxidation in Aqueous Media
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Cyclic Voltammetry as a Potential Predictive Method for Supported Nanocrystalline Gold Catalysts for Oxidation in Aqueous Media

机译:循环伏安法作为负载型纳米晶金催化剂在水介质中氧化的潜在预测方法

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Nanocrystalline supported Au is a potent catalyst for oxidation of alcohols and polyols in aqueous media using oxygen in which exclusive formation of the mono-acid can be observed. However, relatively non-selective catalysts for the same reaction can also be prepared. Herein we present a detailed characterization study of wholly selective and non-selective Au/graphite catalysts used in the oxidation of glycerol to glyceric acid using a combination of cyclic voltammetry (CV) and transmission electron microscopy (TEM). Analysis using TEM, a technique that is often incisive with supported Au catalysts, in this particular case shows that the non-selective catalysts comprise relatively larger Au crystallites as compared to those of the more selective catalysts. In addition, a set of three Au/C with different selectivities for glyceric acid were characterized using TEM but no discernable differences were observed which could be correlated with the selectivity differences. A detailed study using CV shows distinct differences between the four catalysts. In particular, differences in the activity and selectivity of these Au/graphite catalysts towards glycerol oxidation can be correlated to differences in the relative rates of formation of the selective oxygen species and surface poisons as determined using cyclic voltammetry. It is considered that these cyclic voltammetry correlations can have predictive potential for supported Au catalysts.
机译:纳米晶负载的金是使用氧在水性介质中氧化醇和多元醇的有效催化剂,在其中可以观察到单酸的排他性形成。但是,也可以制备用于相同反应的相对非选择性的催化剂。本文中,我们结合循环伏安法(CV)和透射电子显微镜(TEM)对用于甘油氧化为甘油酸的全选择性和非选择性Au /石墨催化剂进行了详细的表征研究。在这种特殊情况下,使用TEM进行分析是一种经常对负载型Au催化剂起关键作用的技术,与非选择性催化剂相比,非选择性催化剂包含相对较大的Au微晶。此外,使用TEM表征了一组对甘油酸具有不同选择性的三个Au / C,但未观察到可辨别的差异,该差异可能与选择性差异相关。使用CV进行的详细研究显示了四种催化剂之间的明显差异。特别地,这些Au /石墨催化剂对甘油氧化的活性和选择性的差异可以与使用循环伏安法测定的选择性氧物种和表面毒物的相对形成速率的差异相关。认为这些循环伏安关系可以对负载的Au催化剂具有预测潜力。

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