TY - JOUR
T1 - Hydrothermal pretreatment of bamboo sawdust using microwave irradiation
AU - Dai, Leilei
AU - He, Chao
AU - Wang, Yunpu
AU - Liu, Yuhuan
AU - Ruan, Roger
AU - Yu, Zhenting
AU - Zhou, Yue
AU - Duan, Dengle
AU - Fan, Liangliang
AU - Zhao, Yunfeng
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018
Y1 - 2018
N2 - In the present study, the effect of temperature and residence time during microwave hydrothermal pretreatment (MHT) on hydrochar properties and pyrolysis behaviors was investigated. Experimental results indicated that higher heating value (HHV) and fixed carbon content gradually increased with increased pretreatment severity. Obvious reduction of oxygen content was found under MHT at 230 °C-15 min and 210 °C-35 min. Although lower mass yield was observed under severe conditions, corresponding energy yield was relatively higher. Crystallinity indexes of hydrochar demonstrated an upward trend with increased residence time. Unlike hydroxyl group, dissociation of acetyls was more favorable under prolonged residence time rather than increased temperature. Peaks in thermogravimetric and derivative thermogravimetric curves shifted to higher temperature region under severe conditions, indicating better thermal stability. Py-GC/MS analysis suggested that acids content was decreased but sugars increased with increased MHT severity. Moreover, compared to temperature, residence time was mainly responsible for acetic acid formation.
AB - In the present study, the effect of temperature and residence time during microwave hydrothermal pretreatment (MHT) on hydrochar properties and pyrolysis behaviors was investigated. Experimental results indicated that higher heating value (HHV) and fixed carbon content gradually increased with increased pretreatment severity. Obvious reduction of oxygen content was found under MHT at 230 °C-15 min and 210 °C-35 min. Although lower mass yield was observed under severe conditions, corresponding energy yield was relatively higher. Crystallinity indexes of hydrochar demonstrated an upward trend with increased residence time. Unlike hydroxyl group, dissociation of acetyls was more favorable under prolonged residence time rather than increased temperature. Peaks in thermogravimetric and derivative thermogravimetric curves shifted to higher temperature region under severe conditions, indicating better thermal stability. Py-GC/MS analysis suggested that acids content was decreased but sugars increased with increased MHT severity. Moreover, compared to temperature, residence time was mainly responsible for acetic acid formation.
KW - Hydrochar properties
KW - Hydrothermal pretreatment
KW - Microwave irradiation
KW - Pyrolysis behaviors
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U2 - 10.1016/j.biortech.2017.08.104
DO - 10.1016/j.biortech.2017.08.104
M3 - Article
C2 - 28950131
AN - SCOPUS:85029686989
SN - 0960-8524
VL - 247
SP - 234
EP - 241
JO - Bioresource Technology
JF - Bioresource Technology
ER -