Hydrogen production from glycerol by supercritical water gasification in a continuous flow tubular reactor

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• 作者：Simao Guo ; Liejin Guo ; ^{lj-guo@mail.xjtu.edu.cn} ; Changqing Cao ; Jiarong Yin ; Youjun Lu ; Ximin Zhang
• 关键词：Hydrogen production ; Glycerol ; Supercritical water gasification (SCWG) ; Kinetics
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5559-5568
• 文件大小：575 K

摘要

In this work, glycerol was used for hydrogen production by supercritical water gasification. Experiments were conducted in a continuous flow tubular reactor at 445鈭?00聽掳C, 25聽MPa, with a short residence time of 3.9鈭?.0聽s. The effects of reaction temperature, residence time, glycerol concentration and alkali catalysts on gasification were systematically studied. The results showed that the gasification efficiency increased sharply with increasing temperature above 487聽掳C. A short residence time of 7.0聽s was enough for 10聽wt%glycerol gasification at 567聽掳C. With the increase of glycerol concentration from 10 to 50聽wt%,聽the gasification efficiency decreased from 88%to 71%at 567聽掳C. The alkali catalysts greatly enhanced water-gas shift reaction and the hydrogen yield in relation to catalysts was in the following order: NaOH聽>聽Na₂CO₃>KOH聽>聽K₂CO₃. The hydrogen yield of 4.93聽mol/mol was achieved at 526聽掳C with 0.1聽wt%NaOH. No char or tar was observed in all experiments. The apparent activation energy and apparent pre-exponential factor for glycerol carbon gasification were obtained by assuming pseudo first-order kinetics.