In this study, the heteroatom classes and molecular structures of nitrogen compounds in vacuum residue arecharacterized by the electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectromet...In this study, the heteroatom classes and molecular structures of nitrogen compounds in vacuum residue arecharacterized by the electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICRMS） combined with the Fourier transform infrared （FT-IR） spectroscopy. The results demonstrate that three basic nitrogencompounds, N1 （in which a molecule contains one nitrogen atom, similarly hereinafter）, N1O1 and N2, are identified bytheir positive-ion mass spectra, and three non-basic nitrogen compounds, N1, N1O1, and N1S1, are characterized by theirnegative-ion mass spectra. Among these nitrogen compounds, the N1 class species are the most predominant. Combinedwith the data of ESI FT-ICR MS and FT-IR, the basic N1 class species are likely alkyl quinolines, naphthenic quinolines,acridines, benzonacridines, while the abundant non-basic N1 class species are derivatives of benzocarbazole. In comparisonwith CGO, the N1 basic nitrogen compounds in VR exhibit a higher average degree of condensation and have much longeralkyl side chains.展开更多
文摘In this study, the heteroatom classes and molecular structures of nitrogen compounds in vacuum residue arecharacterized by the electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICRMS） combined with the Fourier transform infrared （FT-IR） spectroscopy. The results demonstrate that three basic nitrogencompounds, N1 （in which a molecule contains one nitrogen atom, similarly hereinafter）, N1O1 and N2, are identified bytheir positive-ion mass spectra, and three non-basic nitrogen compounds, N1, N1O1, and N1S1, are characterized by theirnegative-ion mass spectra. Among these nitrogen compounds, the N1 class species are the most predominant. Combinedwith the data of ESI FT-ICR MS and FT-IR, the basic N1 class species are likely alkyl quinolines, naphthenic quinolines,acridines, benzonacridines, while the abundant non-basic N1 class species are derivatives of benzocarbazole. In comparisonwith CGO, the N1 basic nitrogen compounds in VR exhibit a higher average degree of condensation and have much longeralkyl side chains.
