Catalytic Fast Pyrolysis of Biomass Pretreated by Torrefaction with Varying Severity

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• 作者：Anqing Zheng ; Zengli Zhao ; Zhen Huang ; Kun Zhao ; Guoqiang Wei ; Xiaobo Wang ; Fang He ; Haibin Li
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：28
• 期：9
• 页码：5804-5811
• 全文大小：470K
• ISSN：1520-5029

文摘

Pretreatment of corncobs using torrefaction was performed in a tubular reactor with varying reaction temperature (210, 240, 270, or 300 掳C) and residence time (20, 40, or 60 min). The torrefied corncobs were subsequently catalytically fast pyrolyzed over nanosized HZSM-5 in a semibatch pyroprobe reactor. The torrefied corncobs were characterized by elemental analysis, thermogravimetric analyzer coupled with Fourier transform infrared spectroscopy (FTIR), and FTIR. The aromatic production was online analyzed by gas chromatography mass spectroscopy. The effect of torrefaction severity on product distribution and aromatic selectivity from catalytic fast pyrolysis of torrefied corncobs was investigated. The experimental results show that torrefaction can serve as an effective thermal pretreatment for improving the selectivity of BTX (benzene, toluene, and xylenes). Light and mild torrefaction (torrefaction at 210 and 240 掳C) has little impact on the aromatic yield. However, severe torrefaction (torrefaction at 270 or 300 掳C) can lead to the sharp increase of coke yield and reduction of aromatic yield. The results could be explained by the serious cross-linking and charring of corncob under severe torrefaction conditions. The optimal torrefaction condition is 210鈥?40 掳C with residence time of 40 min.