Bridging the relationship between hydrothermal pretreatment and co-pyrolysis

Effect of hydrothermal pretreatment on aromatic production

Leilei Dai, Yunpu Wang, Yuhuan Liu, R. R Ruan, Chao He, Dengle Duan, Yunfeng Zhao, Zhenting Yu, Lin Jiang, Qiuhao Wu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of hydrothermal pretreatment (HTP) on the biomass structure and aromatic production in the catalytic co-pyrolysis process was investigated in this study. Fundamental characteristic analysis indicated that HTP removed most of the hemicellulose and some oxygen, enhancing the hydrogen-to-carbon effective ratio (H/Ceff) of biomass. X-ray diffraction, Fourier-transform infrared spectroscopy, and solid-state cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance analysis revealed that HTP mainly interrupted unstable chemical bonds (acetyl groups, glycosidic bonds, and ether linkage in lignin) and changed the biomass crystallinity. Furthermore, HTP remarkably removed alkalis and alkali earth metals (AAEM) from the biomass. To determine the effect of HTP on co-pyrolysis, individual pyrolysis of raw and pretreated corncob was carried out. Results showed that HTP significantly enhanced yields of levoglucosans and furans, both of which are important intermediates for aromatic formation during co-pyrolysis. HTP remarkably increased the aromatic contents of bio-oil in the co-pyrolysis of different corncob samples and polyethylene. The influence of HTP on aromatic production mainly included AAEM removal, hemicellulose decomposition, furan formation, and H/Ceff increments in the pretreated biomass. Thus, HTP has great potential in improving aromatic production during co-pyrolysis of biomass and polyethylene.

Original languageEnglish (US)
Pages (from-to)36-43
Number of pages8
JournalEnergy Conversion and Management
Volume180
DOIs
StatePublished - Jan 15 2019

Fingerprint

Biomass
Pyrolysis
Carbon
Polyethylenes
Earth (planet)
Hydrogen
Magic angle spinning
Chemical bonds
Lignin
Metals
Fourier transform infrared spectroscopy
Ethers
Nuclear magnetic resonance
Polarization
Decomposition
X ray diffraction
Oxygen

Keywords

  • Aromatic
  • Biomass
  • Catalytic co-pyrolysis
  • Hydrothermal pretreatment
  • Polyethylene

Cite this

Bridging the relationship between hydrothermal pretreatment and co-pyrolysis : Effect of hydrothermal pretreatment on aromatic production. / Dai, Leilei; Wang, Yunpu; Liu, Yuhuan; Ruan, R. R; He, Chao; Duan, Dengle; Zhao, Yunfeng; Yu, Zhenting; Jiang, Lin; Wu, Qiuhao.

In: Energy Conversion and Management, Vol. 180, 15.01.2019, p. 36-43.

Research output: Contribution to journalArticle

Dai, Leilei ; Wang, Yunpu ; Liu, Yuhuan ; Ruan, R. R ; He, Chao ; Duan, Dengle ; Zhao, Yunfeng ; Yu, Zhenting ; Jiang, Lin ; Wu, Qiuhao. / Bridging the relationship between hydrothermal pretreatment and co-pyrolysis : Effect of hydrothermal pretreatment on aromatic production. In: Energy Conversion and Management. 2019 ; Vol. 180. pp. 36-43.
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AU - He, Chao

AU - Duan, Dengle

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AB - The effect of hydrothermal pretreatment (HTP) on the biomass structure and aromatic production in the catalytic co-pyrolysis process was investigated in this study. Fundamental characteristic analysis indicated that HTP removed most of the hemicellulose and some oxygen, enhancing the hydrogen-to-carbon effective ratio (H/Ceff) of biomass. X-ray diffraction, Fourier-transform infrared spectroscopy, and solid-state cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance analysis revealed that HTP mainly interrupted unstable chemical bonds (acetyl groups, glycosidic bonds, and ether linkage in lignin) and changed the biomass crystallinity. Furthermore, HTP remarkably removed alkalis and alkali earth metals (AAEM) from the biomass. To determine the effect of HTP on co-pyrolysis, individual pyrolysis of raw and pretreated corncob was carried out. Results showed that HTP significantly enhanced yields of levoglucosans and furans, both of which are important intermediates for aromatic formation during co-pyrolysis. HTP remarkably increased the aromatic contents of bio-oil in the co-pyrolysis of different corncob samples and polyethylene. The influence of HTP on aromatic production mainly included AAEM removal, hemicellulose decomposition, furan formation, and H/Ceff increments in the pretreated biomass. Thus, HTP has great potential in improving aromatic production during co-pyrolysis of biomass and polyethylene.

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