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Ex-situ catalytic fast pyrolysis of biomass over HZSM-5 in a two-stage fluidized-bed/fixed-bed combination reactor
被引:85
作者:
Hu, Changsong
[1
]
Xiao, Rui
[1
]
Zhang, Huiyan
[1
]
机构:
[1] Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China
基金:
中国国家自然科学基金;
美国国家科学基金会;
关键词:
Biomass;
Catalytic fast pyrolysis;
HZSM-5;
Ex-situ;
Olefins;
Fluidized bed;
IN-SITU;
LIGNOCELLULOSIC BIOMASS;
BIO-OIL;
ZEOLITE;
CONVERSION;
TRANSFORMATION;
PARAMETERS;
GC/MS;
D O I:
10.1016/j.biortech.2017.07.011
中图分类号:
S2 [农业工程];
学科分类号:
0828 ;
摘要:
Ex-situ and in-situ catalytic fast pyrolysis (CFP) of biomass over HZSM-5 were compared in a two-stage fluidized-bed/fixed-bed combination reactor. Ex-situ CFP gave a similar carbon yield of aromatics + olefins (similar to 20%) with in-situ CFP but produced much more olefins (10.3% vs. 5.8%) and less char + coke (42.7% vs. 48.4%). The effects of weight hourly space velocity (WHSV), carrier gas flow rate, pyrolysis temperature and catalysis temperature on product distribution in ex-situ CFP were further studied. The maximum carbon yield of aromatics + olefins (21.7%) was obtained at pyrolysis temperature of 550 degrees C and catalysis temperature of 600 degrees C with the highest carrier gas flow rate (1.2 L/min) and WHSV of 1.33 h(-1). Obviously less coke was generated at higher pyrolysis temperature. When catalysis temperature increased to 700 degrees C, ethylene and benzene carbon selectivities boosted to 79.4% and 60.5%, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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页码:1133 / 1140
页数:8
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