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首页> 外文期刊>Chemistry: A European journal >Reaction mechanism of aerobic oxidation of alcohols conducted on activated-carbon-supported cobalt oxide catalysts
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Reaction mechanism of aerobic oxidation of alcohols conducted on activated-carbon-supported cobalt oxide catalysts

机译：在活性炭负载的氧化钴催化剂上进行酒精的好氧氧化反应机理

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摘要

Catalytic performances and the reaction mechanism of Co_3O _4/AC (AC=activated carbon) for aerobic oxidation of alcohols carried out in the liquid phase were investigated. Co_3O_4/AC shows a high activity for aerobic oxidation of benzyl alcohol, comparable to noble metal catalysts (e.g., Au/AC) even in the absence of additives or promoters (e.g., NaOH). Changing preparation conditions, such as treatment temperature and/or time, can affect the catalytic performances of Co_3O _4/AC, due to decomposition of surface groups of the carbon support. Careful studies show that low alcohol conversions are obtained with either Co_3O_4 or AC alone, which indicates that the high conversion observed over the Co_3O_4/AC is due to a synergistic effect between Co_3O_4 and AC. Parallel experiments using a high-surface-area covalent triazine framework or oxygen-inert carbon nitride as support for the Co_3O_4 catalyst also show lower conversions, which suggest that the ability of AC (in Co_3O_4/AC) to activate molecular oxygen is essential for the reaction. FTIR and XPS spectra taken from catalysts before and after the reaction confirm that oxygen activation proceeds mainly on the carbon support. As a result, it can be assumed that the alcohol dehydrogenation step proceeds on the metal oxide, whereas the oxygen activation step occurs mainly on the carbon support.
机译：研究了Co_3O_4 / AC（AC =活性炭）在液相中对酒精进行好氧氧化的催化性能和反应机理。与贵金属催化剂（例如，Au / AC）相比，Co_3O_4 / AC显示出对苄醇的好氧氧化的高活性，即使在没有添加剂或助催化剂（例如，NaOH）的情况下。改变制备条件，例如处理温度和/或时间，可能会由于碳载体表面基团的分解而影响Co_3O_4 / AC的催化性能。仔细的研究表明，仅通过Co_3O_4或AC就能获得低醇转化率，这表明在Co_3O_4 / AC上观察到的高转化率是由于Co_3O_4与AC之间的协同作用所致。使用高表面积共价三嗪骨架或氧惰性氮化碳作为Co_3O_4催化剂的载体的平行实验也显示出较低的转化率，这表明AC（在Co_3O_4 / AC中）活化分子氧的能力对于碳纳米管至关重要。反应。从反应前后的催化剂获得的FTIR和XPS光谱证实，氧活化主要在碳载体上进行。结果，可以认为醇脱氢步骤在金属氧化物上进行，而氧活化步骤主要在碳载体上进行。

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