Characteristics and Evolution of Nitrogen in the Heavy Components of Algae Pyrolysis Bio-Oil

Algae pyrolytic bio-oil contains a large quantity of N-containing components (NCCs), which can be processed as valuable chemicals, while the harmful gases also released during upgrading. However, characteristics NCCs in bio-oil, especially composition heavy (molecular weight ≥200 Da), have not been fully studied due to limitation advanced analytical methods. In this study, three kinds algae rich lipids, proteins, and carbohydrates were rapidly pyrolyzed (10-25 °C/s) at different temperatures (300-700 °C). The was analyzed using Fourier transform ion cyclotron resonance mass spectrometer equipped with electrospray ionization, evolution nitrogen first obtained. results indicated that molecular most distributed 200-400 Da range. N1-3 compounds account for over 60% lipid protein-rich samples, N0 N4 are prominent carbohydrate-rich samples. As temperature increases, become more aromatic contain less O strong Maillard deoxygenation reactions. Moreover, heavier promoted form lighter atoms through decomposition (mainly denitrogenation deoxygenation). Finally, some strategies deal high-quality production proposed.