Cellulose-derived carbon spheres produced under supercritical ethanol conditions

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• 作者：Kubilay Tekin ; Filoklis D. Pileidis…
• 关键词：Cellulose ; Sustainable products ; Carbon spheres ; Supercritical ethanol ; KOH catalyst
• 刊名：Clean Technologies and Environmental Policy
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：18
• 期：1
• 页码：331-338
• 全文大小：2,004 KB
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• 作者单位：Kubilay Tekin (1)
  Filoklis D. Pileidis (2)
  Mehmet K. Akalin (3)
  Selhan Karagöz (4)
  
  1. Department of Occupational Health and Safety, Karabük University, 78050, Karabük, Turkey
  2. School of Engineering and Materials Science, Queen Mary University of London, London, UK
  3. Department of Environmental Engineering, Karabük University, 78050, Karabük, Turkey
  4. Department of Polymer Engineering, Karabük University, 78050, Karabük, Turkey
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Industrial Chemistry and Chemical Engineering
  Industrial Pollution Prevention
  Environmental Economics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-9558

文摘

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 °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 °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.