Xiaobo Chen, Yibin Liu, Jin Wang, Honghong Shan, Chaohe Yang, Chunyi Li
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
Appl Petrochem Res. 2014;4(4):417-422. doi: 10.1007/s13203-014-0083-9. Epub 2014 Sep 10.
In this study, the classes and structures of nitrogen species in coker gas oil (CGO) are characterized by electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with Fourier transform infrared (FT-IR) spectroscopy. The results demonstrate that the / of basic and non-basic nitrogen compounds ranges from 180 to 560 and from 200 to 460, respectively. Six basic nitrogen compounds, N1 (a molecule contains one nitrogen atom, similarly hereinafter), N1O1, N1O1S1, N1O2, N1S1, and N2, are identified by their positive-ion mass spectra, and four non-basic nitrogen compounds, N1, N1O1, N1S1, and N2, are characterized by their negative-ion mass spectra. Among these nitrogen compounds, the N1 class species are the most predominant. Combined with the data of ESI FT-ICR MS and FT-IR, the basic N1 class species are likely pyridines, naphthenic pyridines, quinolines, and benzoquinolines. The most non-basic N1 class species are derivatives of benzocarbazole. The N2 class species are likely amphoteric molecules with pyridine and pyrrole core structures.
在本研究中，采用电喷雾电离（ESI）傅里叶变换离子回旋共振质谱（FT-ICR MS）结合傅里叶变换红外（FT-IR）光谱对焦化蜡油（CGO）中氮物种的类别和结构进行了表征。结果表明，碱性和非碱性氮化合物的/分别为180至560和200至460。通过其正离子质谱鉴定出六种碱性氮化合物，即N1（一个分子含有一个氮原子，以下同理）、N1O1、N1O1S1、N1O2、N1S1和N2，通过其负离子质谱表征出四种非碱性氮化合物，即N1、N1O1、N1S1和N2。在这些氮化合物中，N1类物种最为主要。结合ESI FT-ICR MS和FT-IR的数据，碱性N1类物种可能是吡啶、环烷吡啶、喹啉和苯并喹啉。最非碱性的N1类物种是苯并咔唑的衍生物。N2类物种可能是具有吡啶和吡咯核心结构的两性分子。
