Abstract Defatted cottonseed meal is a N-rich biomass that deserves valorized recycling. In this work, slow pyrolysis was applied to produce pyrolytic bio-oil from this biomass. Both the upper oily and lower aqueous fractions were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) with both negative and positive electrospray ionization modes. The contents of C and S were much higher in the oily fraction than in the aqueous fraction. Furthermore, the composition and molecular formulas of the organic compounds in the oily fraction were much more complex and diverse. From the mass spectral analysis, 9 and 14 different oxygen heteroatom classes were detected in the aqueous and oily fractions, respectively. While CHON compounds were found in both fractions, CHONS compounds were detected only in the oily fraction. The van Krevelen diagrams from the FT-ICR-MS data showed the presence of lipid-, peptide-, and lignin-like components in both fractions. However, carbohydrate-like components were found only in the oily fraction. Furthermore, the diagrams revealed more N species in the oily fraction that mostly clustered with O/C

中文翻译：

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超高分辨率电喷雾电离傅立叶变换离子回旋共振质谱表征脱脂棉籽粕热解生物油

摘要 脱脂棉籽粕是一种富含氮的生物质，值得回收利用。在这项工作中，应用缓慢热解从这种生物质中生产热解生物油。通过元素分析、傅里叶变换红外 (FT-IR) 光谱和具有负电喷雾和正电喷雾电离模式的超高分辨率傅里叶变换离子回旋共振质谱 (FT-ICR-MS) 对上层油性和下层水相进行表征。C和S在油馏分中的含量远高于在水馏分中的含量。此外，油性馏分中有机化合物的组成和分子式更加复杂和多样。从质谱分析中，分别在水性和油性馏分中检测到 9 种和 14 种不同的氧杂原子类别。虽然在两个馏分中都发现了 CHON 化合物，但仅在油性馏分中检测到了 CHON 化合物。来自 FT-ICR-MS 数据的 van Krevelen 图显示两个部分中都存在脂质、肽和木质素样成分。然而，仅在油性部分中发现了类碳水化合物成分。此外，图表还揭示了油性馏分中更多的 N 物种，主要与 O/C 聚集在一起。