Photoassisted catalytic oxidation of alcohols and halogenated hydrocarbons with amorphous manganese oxides
Photoassisted catalytic oxidation of alcohols and halogenated hydrocarbons with amorphous manganese oxides
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DOI：
10.1016/s0920-5861(96)00119-8
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发表时间：
1997-01-17
期刊：
影响因子：
5.3
通讯作者：
Suib, SL
中科院分区：
文献类型：
--
作者：
Chen, J;Lin, JC;Suib, SL
本文讨论了非晶锰氧化物（AMO）材料的合成，用于醇类和卤代烃的高效光助催化氧化。表征研究表明，氧是从AMO非常容易在光照下失去，产生的氧空位，可能是重要的光氧化反应。醇在室温下以100%的选择性从异丙醇转化为酮如丙酮。这些AMO系统的周转数比异丙醇氧化的TiO 2系统大一个数量级以上，并且比卤代烃分解的TiO 2系统大一个数量级以上。此外，TiO 2系统比AMO材料中毒快得多，特别是在降解卤代烃时。同样的高活性和选择性发生在卤代烃如溴甲烷的完全氧化中，其转化为CO2、H2O和Br-2。这些材料的合成，表征和光活性将被讨论。AMO光催化剂在氯甲烷和碘甲烷的分解中也是活性的。
This manuscript discusses the synthesis of Amorphous Manganese Oxide (AMO) materials that are used for efficient photoassisted catalytic oxidation of alcohols and halogenated hydrocarbons. Characterization studies suggest that oxygen is lost from AMO very readily under illumination, creating oxygen vacancies that may be important in photooxidation reactions. Alcohols are converted to ketones such as acetone from isopropanol with 100% selectivity at room temperature. These AMO systems have turnover numbers that are over one order of magnitude greater than TiO2 systems for isopropanol oxidation and over an order of magnitude greater than for TiO2 systems in decomposition of halogenated hydrocarbons. In addition the TiO2 systems are poisoned much faster than the AMO materials, especially in degradation of halogenated hydrocarbons. The same high activity and selectivity occur for the total oxidation of halogenated hydrocarbons such as methyl bromide which is converted into CO2, H2O and Br-2. The synthesis, characterization, and photoactivity of these materials will be discussed. AMO photocatalysts are also active in the decomposition of methyl choride and methyl iodide.