Microwave-assisted co-pyrolysis of Chlorella vulgaris and wood sawdust using different additives

[Display omitted] •Co-pyrolysis of chlorella and sawdust was investigated.•Activated carbon had better temperature response to microwave than silicon carbide.•Aromatics in bio-oil improved by co-pyrolysis of sawdust and chlorella.•Microwave pyrolysis with activated carbon had higher gas and liquid y...

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Bibliographic Details
Published in:Bioresource technology 2019-02, Vol.273, p.34-39
Main Authors: Chen, Lin, Yu, Zhaosheng, Xu, Hao, Wan, Kuangyu, Liao, Yanfen, Ma, Xiaoqian
Format: Article
Language:English
Subjects:
Additives
alkenes
aromatization
biochar
biofuels
carbon
Chlorella vulgaris
Co-pyrolysis
denitrification
liquids
microwave treatment
Microwave-assisted
pyrolysis
Sawdust
silicon carbide
wood
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Summary:[Display omitted] •Co-pyrolysis of chlorella and sawdust was investigated.•Activated carbon had better temperature response to microwave than silicon carbide.•Aromatics in bio-oil improved by co-pyrolysis of sawdust and chlorella.•Microwave pyrolysis with activated carbon had higher gas and liquid yield.•High calorific bio-char was made by microwave-assisted pyrolysis of sawdust. The microwave-assisted co-pyrolysis of Chlorella vulgaris (CV), wood sawdust (WS) and their blends with additives were investigated. There was a higher liquid and solid yield with silicon carbide (SiC) than activated carbon (AC) in most of samples. Microwave-assisted pyrolysis with additives behaved a positive effect on deoxygenation and aromatization, but not apparent denitrification. With the increase of CV proportion, aromatic hydrocarbons decreased, but aliphatic hydrocarbons increased using AC. High selectivity of phenols was reached at the sample of WS (relative content as 43.6%) using SiC; High selectivity of alkenes was reached at the sample of CV (relative content as 31.2%) and alkanes at the blend sample of 70% CV and 30% WS (relative content as 9.45%). Bio-oil and biochar from microwave-assisted pyrolysis of WS had higher calorific value than that of CV both with AC and SiC. Calorific value of bio-oil decreased by 33.3% after mixing CV with WS.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2018.10.086