Effect of autohydrolysis pretreatment on biomass structure and the resulting bio-oil from a pyrolysis process
| Autor: | Arthur J. Ragauskas, Qining Sun, Naijia Hao, Sushil Adhikari, Haoxi Ben, Qiong Wu, Tais Lacerda Bezerra |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
020209 energy General Chemical Engineering Levoglucosan Organic Chemistry Energy Engineering and Power Technology Ether 02 engineering and technology 021001 nanoscience & nanotechnology chemistry.chemical_compound Fuel Technology Pyrolysis oil 0202 electrical engineering electronic engineering information engineering Magic angle spinning Organic chemistry Lignin Hemicellulose Fourier transform infrared spectroscopy 0210 nano-technology Pyrolysis |
| Zdroj: | Fuel. 206:494-503 |
| ISSN: | 0016-2361 |
| Popis: | Pyrolysis is a promising method for converting biomass to biofuels. However, some of pyrolysis oil's physiochemical properties still limit its commercial applications. In this study, the autohydrolysis pretreatment at 175 ± 3 °C for 40 min was conducted to improve the resulting pine pyrolysis oil’s properties as a fuel. During autohydrolysis, deacetylation and decomposition of hemicellulose was observed by ion-exchange chromatography and Fourier transform infrared spectroscopy (FT-IR). In addition, the cleavage of lignin ether bonds was clearly determined by 13 C cross-polarization/magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR). Phosphitylation followed by 31 P NMR analysis of the heavy oils gave detailed structural information of the hydroxyl groups; the results revealed that autohydrolysis pretreatment led to a reduction of carboxyl acids in the heavy oils generated at all three pyrolysis temperatures (400, 500, and 600 °C). The 31 P NMR analysis also revealed that autohydrolysis pretreatment led to a reduction of condensed phenolic hydroxyl groups in the heavy oils produced at 600 °C. 1 H- 13 C heteronuclear single-quantum correlation (HSQC) NMR analysis showed that at a pyrolysis temperature of 600 °C, the pretreated pine produced lower methoxy group constituents. Both 31 P and HSQC NMR results indicated that autohydrolysis pretreatment increased levoglucosan yields in the bio-oils. |
| Databáze: | OpenAIRE |
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