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首页> 外文期刊>Catalysis science & technology >Modifications of the metal and support during the deactivation and regeneration of Au/C catalysts for the hydrochlorination of acetylene
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Modifications of the metal and support during the deactivation and regeneration of Au/C catalysts for the hydrochlorination of acetylene

机译：金属的修饰和在乙二醇盐水的AU/C催化剂停用和再生过程中的支持和支撑

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摘要

The effect of the gold oxidation state and carbon structure on the activity of Au/C catalysts for the hydrochlorination of acetylene was investigated by a combined approach using TPR, XPS and porosimetry determinations. The activity of the catalyst in the synthesis of vinyl chloride monomer was found to be dependent on the presence of Au~(3+) species in the catalyst However, by preparing catalysts with different Au~(3+) content it was possible to determine the existence of a threshold Au~(3+) amount, beyond which the excess of Au~(3+) was not active for the reaction. This was explained by the existence of active sites at the Au/C interface, and not just by the presence of Au~(3+) species on top of Au nanoparticies, as explained by current models for these catalysts. It was also possible to determine the existence of a subset of Au nanoclusters which do not take part In the reaction, as well as changes in the textural properties of the carbon that can affect its long term reusability.
机译：黄金氧化态和碳结构对AU/C催化剂活性对乙炔盐水的活性的影响通过使用TPR，XPS和孔隙率测定的联合方法研究。 发现催化剂在合成乙烯基氯化物单体中的活性取决于催化剂中Au〜（3+）物种的存在，但是，通过制备具有不同AU〜（3+）含量的催化剂，可以确定可以确定的含量 阈值au〜（3+）的存在，超出反应的过量（3+）并不活跃。 这是通过Au/C界面上的活性位点的存在来解释的，不仅是通过Au纳米官方的Au〜（3+）物种的存在，正如当前模型为这些催化剂所解释的那样。 还可以确定不参与反应的Au纳米簇子集的存在，以及碳的质地特性的变化，可能会影响其长期可重复使用。

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