Microalgae are a promising feedstock for carbon-neutral biofuel production due to their superior cellular composition. Alternatively, oxidative torrefaction has been recognized as a potential thermochemical technique for microalgal solid biofuel upgrading. Herein, by using microalga N. oceanica as a feedstock, several characterizations are adopted for evaluating the potential of oxidative torrefaction towards microalgal solid biofuel production. The oxidatively torrefied microalgae can be upgraded as lignite. After in-depth analysis, significant change in the surface microstructure of oxidatively torrefied microalgae is largely changed (via wrinkle and fragmentation) The hydrophobicity, thermal decomposition, thermal stability, and aromatization of oxidatively torrefied microalgae can be largely enhanced as the oxidative torrefaction severity increase. With the increasing torrefaction temperature, the hydrophobicity of oxidative torrefied microalgae gradually improved. The decomposition of C-2/3/5, and −OCH₃, the CO bonds of CH₃CO-, and the aromatization occurs via oxidative torrefaction according to the NMR analysis. For XPS analysis, torrefaction operation significantly decreases the carbide carbon and enhances the graphitization. As a result, the thermal stability of oxidatively torrefied microalgae is improved. Conclusively, the information obtained in this study can provide insights into the evaluation of oxidative torrefaction performance and fuel properties of microalgal solid biofuel, which may help accelerate the advancement of oxidative torrefaction industrialization.

由于其优越的细胞组成，微藻是一种有前途的碳中性生物燃料生产原料。或者，氧化烘焙已被认为是微藻固体生物燃料升级的潜在热化学技术。在此，通过使用微藻N. Oceanica作为原料，采用了几种特征来评估氧化烘焙对微藻固体生物燃料生产的潜力。氧化烘焙的微藻可以升级为褐煤。经过深入分析，氧化烘焙微藻表面微观结构发生显着变化（通过起皱和碎裂） 氧化烘焙微藻的疏水性、热分解、热稳定性和芳构化可随着氧化烘焙严重程度的增加而大大增强. 随着烘焙温度的升高，氧化烘焙微藻的疏水性逐渐提高。C-2/3/5，和-OCH的分解₃中，CO CH债券₃CO-，根据NMR分析，芳构化通过氧化烘焙发生。对于 XPS 分析，烘焙操作显着降低了碳化物碳并增强了石墨化。结果，提高了氧化烘焙微藻的热稳定性。总之，本研究获得的信息可以为微藻固体生物燃料的氧化烘焙性能和燃料特性的评估提供见解，这可能有助于加速氧化烘焙产业化的推进。