Co-pyrolysis characteristics and pyrolysis oil analysis of Chlorella vulgaris and marine waste plastics with multi-metal MOFs-derived additive

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 498; p. 154854
• Main Authors: Wan, Shouqiang, Chen, Chunxiang, Yang, Ronglin, Zhao, Shiyi, He, Shiyuan, Zhao, Xingchen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2024
• Subjects: Chlorella vulgaris; Dual-function additives; Marine waste plastics; Microwave co-pyrolysis; Pyrolysis oil; Pyrolysis oil; Marine waste plastics; Chlorella vulgaris; Microwave co-pyrolysis; Dual-function additives
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2024.154854

[Display omitted] •The maximum oil yield (14.33%) of CV and MW co-pyrolysis obtained at 30% Ni-Cu-Co@C.•The highest selectivity of aromatic hydrocarbons in hydrocarbons reached 30.07%.•The maximum denitrification and deoxygenation efficiency occurred at 30% Ni-Cu-Co@C.•After 5 times of recycling, the activity of the Ni-Cu-Co@C was still high (Nn = 0.66). In this study, MOFs-derived additives with microwave absorption and catalytic characteristics were employed in the microwave co-pyrolysis of Chlorella vulgaris (CV) and marine waste plastics (MW) to produce high-quality pyrolysis oil. The effects of additives (Ni-Cu@C, Ni-Co@C, Cu-Co@C and Ni-Cu-Co@C) under different addition amounts (10%, 20%, 30%) on co-pyrolysis characteristics, product yield and pyrolysis oil composition were investigated. Furthermore, the pyrolysis mechanism was analyzed. The results showed that the MOFs-derived additives improved the co-pyrolysis characteristics, especially at 30% addition amount. The maximum average weight loss rate (0.0273 wt.%/s) and pyrolysis oil yield (14.33%) obtained at 30% Ni-Cu-Co@C group. Moreover, the aromatic content (30.07%), deoxygenation efficiency (27.70%) and denitrogenation efficiency (80.03%) in pyrolysis oil were maximum at adding 30% Ni-Cu-Co@C. Ni-Cu-Co@C promoted the nitrogen transformation into gaseous products, while reduced the nitrogen contents in char and pyrolysis oil. Meanwhile, the nitrogen in char was dominated by pyridine-N and quaternary-N. Importantly, the activity of the Ni-Cu-Co@C remained 0.66 times of the initial activity after 5 cycles, demonstrating the excellent regenerative usability.