Hydrocarbon-rich pyrolysis oils produced from landfill waste and recycled plastics are potential sources for fuels and chemicals. It is well established that feedstock composition significantly affects pyrolysis oil composition and, hence, its potential uses. For example, plastics waste pyrolysis oils contain a high concentration of hydrocarbons, whereas biomass pyrolysis oils have high oxygen content. Previous studies have shown that the addition of plastics to a biomass feedstock increases the hydrocarbon content; however, a detailed analysis of hydrocarbons and polar species from pyrolysis oils produced from “real world” mixed municipal waste materials has not yet been done. Here, the silica gel fractions from unsorted landfill waste and mixed recycled plastics pyrolysis oils are analyzed by two-dimensional gas chromatography (GC × GC), field ionization mass spectrometry (FI-MS), Fourier transform infrared spectroscopy (FT-IR), and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Gravimetric results show that the plastics pyrolysis oil has a much greater concentration of saturated hydrocarbons than the more aromatic landfill pyrolysis oil. GC × GC and FI-MS for the saturated hydrocarbons show a range of alkanes, cycloalkanes, olefins, and 1-ring aromatics. Molecular elemental compositions from FT-ICR MS were correlated with structural assignments from GC × GC to expand the structural understanding of the aromatic hydrocarbons from plastics and landfill pyrolysis oils and showed that the aromatic hydrocarbons from the landfill are both peri- and cata-condensed. In contrast, plastics pyrolysis oil consists of polyphenyls and cata-condensed aromatic hydrocarbons. The polar species from the plastics pyrolysis oil contain more alcohol functionalities than the landfill pyrolysis oil, which contains non-carboxyl carbonyl functional groups. Improved structural understanding of both pyrolysis oils will provide better understanding of their properties and potential uses.

中文翻译：

---

市政废热解油硅胶馏分的组成和结构分析

由垃圾填埋场产生的富含碳氢化合物的热解油和再生塑料是燃料和化学物质的潜在来源。公认的是，原料组成显着影响热解油的组成，并因此影响其潜在用途。例如，废塑料热解油含有高浓度的碳氢化合物，而生物质热解油具有高的氧含量。先前的研究表明，向生物质原料中添加塑料会增加碳氢化合物的含量。但是，尚未对由“现实世界”混合的市政废物产生的热解油中的碳氢化合物和极性物质进行详细分析。在此，通过二维气相色谱（GC×GC）分析未分类的垃圾填埋场废料和混合的再生塑料热解油中的硅胶馏分，场电离质谱（FI-MS），傅里叶变换红外光谱（FT-IR）和傅里叶变换离子回旋共振质谱（FT-ICR MS）。重量分析结果表明，塑料热解油中的饱和烃浓度比芳香度更高的垃圾填埋热解油要大得多。饱和烃的GC×GC和FI-MS显示了一系列烷烃，环烷烃，烯烃和1环芳烃。FT-ICR MS的分子元素组成与GC×GC的结构分配相关联，从而扩展了对塑料和垃圾填埋热解油中芳烃的结构理解，并表明垃圾填埋中的芳烃同时发生了催化和缩合反应。相比之下，塑料热解油由聚苯和催化缩合的芳烃组成。来自塑料热解油的极性物质比包含非羧基羰基官能团的垃圾填埋热解油具有更多的醇官能度。更好地了解两种热解油的结构，可以更好地了解其性质和潜在用途。