Hydrogen Transfer Route during Hydrothermal Treatment of Lignite Using the Isotope Tracer Method and Improving the Pyrolysis Tar Yield

详细信息    查看全文

• 作者：Lanlan Wang ; Tieying Pan ; Peng Liu ; Dexiang Zhang
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：30
• 期：6
• 页码：4562-4569
• 全文大小：423K
• 年卷期：0
• ISSN：1520-5029

文摘

Hydrothermal treatment was used to upgrade Inner Mongolia lignite (IML) before pyrolysis. The hydrogen transfer route during hydrothermal treatment of lignite by the isotope tracer method was carried out in an autoclave. Typical experiments of D₂O substituted for pure water under four treatment temperatures (180, 220, 260, and 300 °C) were also performed. The pyrolysis tar composition was analyzed by ¹H nuclear magnetic resonance (NMR) and gas chromatography and mass spectrometry (GC–MS). Four kinds of typical substances were studied in detail in tar from D₂O-treated lignite, and the deuterated extent (D1, D2, D3, and D4) was quantitated by selected peaks in mass spectra. The results showed that the deuterium atom was more prone to incorporate into the aromatic ring with respect to aliphatic carbon chains. The values of D2, D3, and D4 were all increased with the increase of the treatment temperature. Toluene and phenol analyses showed that deuterium atoms incorporated into the aromatic ring were distinct by different substituents. The route of hydrogen transfer during hydrothermal treatment was well-investigated by the deuterium tracer method.