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首页> 外文期刊>Clean technologies and environmental policy >Cellulose-derived carbon spheres produced under supercritical ethanol conditions
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Cellulose-derived carbon spheres produced under supercritical ethanol conditions

机译：在超临界乙醇条件下产生的纤维素衍生碳球

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This study investigates the production of spherical carbons from cellulose under sub- and supercritical ethanol conditions with and without the addition of a potassium hydroxide (KOH) catalyst. Different temperatures (200 and 280 A degrees C), residence times (0.5, 1, 2, and 4 h), and KOH concentrations (5, 10, and 20 wt% of cellulose) were used for the carbonization process. Carbon spheres could only be obtained under supercritical ethanol conditions (at 280 A degrees C and 9.5 MPa). Supercritical ethanol decreases the oxygen content by a significant amount, thereby increasing the heating value. Morphological studies show that the carbons are essentially spherical of different sizes depending on the operating conditions (such as the presence of a catalyst and time). For the first time, we showed that spherical carbons can be obtained under supercritical ethanol conditions. This is a useful result as, for instance, ethanol can be produced from cellulose, and this opens the possibility for the development of a green and simple procedure to synthesize carbon spheres that may have many different applications including gas separation, catalysis, and energy storage.
机译：这项研究研究了在亚临界和超临界乙醇条件下，添加和不添加氢氧化钾（KOH）催化剂时，纤维素生产球形碳的方法。碳化过程使用了不同的温度（200和280 A摄氏度），停留时间（0.5、1、2和4小时）和KOH浓度（纤维素的5、10和20 wt％）。碳球只能在超临界乙醇条件下（在280 A摄氏度和9.5 MPa下）获得。超临界乙醇大大降低了氧气含量，从而提高了发热量。形态学研究表明，根据操作条件（例如催化剂的存在和时间），碳基本为球形，大小不同。首次，我们表明可以在超临界乙醇条件下获得球形碳。这是一个有用的结果，例如可以从纤维素中生产乙醇，这为开发绿色简单的方法来合成碳球提供了可能性，该碳球可能具有许多不同的应用，包括气体分离，催化和能量存储。

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