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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Acetone synthesis from ethanol and the Mars and Van Krevelen mechanism using CeO2 and AgCeO2 nanostructured catalysts
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Acetone synthesis from ethanol and the Mars and Van Krevelen mechanism using CeO2 and AgCeO2 nanostructured catalysts

机译：使用CeO2和AgCEO2纳米结构催化剂的乙醇和MARS和van Krevelen机理的丙酮合成

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摘要

Nanostructured CeO2 based catalysts were employed as tools to shed light on the mechanism of the acetone synthesis from ethanol. The oxides were characterized using HRTEM, EPR, and other techniques. Rates of ethanol consumption and products formation were measured at differential conditions. The catalysts prepared employing Ce(NO3)(3) generate nanocubes, whereas when (NH4)(2)Ce(NO3)(6) is used, nanopolyhedral particles are synthesised. The later forms O vacancies more easily. This property enhances when Ag is added to the nanopolyhedral catalyst. The correlation between the catalytic behaviour and the nanocatalysts's physicochemical properties showed that O vacancies participate as Brunsted basic sites in the acetaldehyde synthesis and that the easier the O vacancies generation, the higher the rate of the acetone synthesis is. The O abstraction from the CeO2 lattice by acetaldehyde (Mars and Van Krevelen mechanism) is the slowest step of the acetone synthesis from ethanol, showing that this synthesis exhibits a relevant redox characteristic.
机译：纳米结构的CeO2基催化剂被用来解释乙醇合成丙酮的机理。使用HRTEM、EPR和其他技术对氧化物进行了表征。在不同条件下测量乙醇消耗率和产物形成率。使用Ce（NO3）（3）制备的催化剂生成纳米立方体，而当使用（NH4）（2）Ce（NO3）（6）时，合成纳米多面体颗粒。后者更容易形成空位。当银加入到纳米多面体催化剂中时，这种性能增强。催化性能与纳米催化剂的物理化学性质之间的相关性表明，O空位作为Brunsted碱性位点参与乙醛的合成，并且O空位的生成越容易，丙酮的合成速率越高。乙醛从CeO2晶格中提取O（Mars和Van Krevelen机理）是乙醇合成丙酮的最慢步骤，表明该合成具有相关的氧化还原特性。

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