We have developed a new liquid-phase noncatalytic selective oxidation of polyhydric alcohols such as glycerol. This method involves the use of a nonthermal atmospheric-pressure plasma instead of precious-metal catalysts. We found that noncatalytic selective oxidation of glycerol achieved a conversion comparable to that achieved by gold-catalyzed oxidation, and the desired glyceric acid, which is a pharmaceutical raw material, was obtained. When the solution pH was changed from strongly alkaline to neutral, the main reaction switched from the one that occurs in the presence of gold catalysts to the one that occurs in the presence of platinum catalysts. These results suggest that the reactive oxygen species generated by nonthermal atmospheric-pressure plasma irradiation vary depending on the solution pH.

中文翻译：

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非热常压等离子体辐射作为多元醇非催化液相选择性氧化新方法的应用

我们开发了一种新型的液相非催化选择性氧化多元醇（例如甘油）的方法。该方法涉及使用非热常压等离子体代替贵金属催化剂。我们发现甘油的非催化选择性氧化实现了与金催化氧化相当的转化率，并获得了所需的医药原料甘油酸。当溶液pH值从强碱性变为中性时，主要反应从金催化剂存在下发生的反应转变为铂催化剂存在下发生的反应。这些结果表明，非热常压等离子体照射产生的活性氧随溶液 pH 值的变化而变化。