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Kinetic study of the pyrolysis of microalgae under nitrogen and CO2 atmosphere

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  • Hong, Yu
  • Xie, Chengrui
  • Chen, Wanru
  • Luo, Xiang
  • Shi, Kaiqi
  • Wu, Tao

Abstract

In this study, three primary components of algae (lipid, carbohydrate and protein) and one microalgae (spirulina) were pyrolyzed using a thermogravimetric analyser (TGA) under nitrogen and CO2 atmosphere at four heating rates. It was found that protein decomposed first, followed by carbohydrate and then lipid. The kinetic study revealed that the lowest activation energy for the initiation of the pyrolysis of ovalbumin (protein) is ∼70 kJ/mol. Oil droplet showed higher activation energy of 266.5 kJ/mol during its pyrolysis in the CO2 atmosphere, which suggests that algal lipid is more difficult to decompose in the CO2 atmosphere. However, for the pyrolysis of cellulose (carbohydrate), the activation energy (∼310 kJ/mol) is similar under two different gas atmospheres tested. This study showed that CO2 atmosphere favors the pyrolysis of algae with high protein content and low lipid content, since the existence of CO2 promotes the cracking of VOCs (volatile organic compounds) as well as the reaction between VOCs and CO2.

Suggested Citation

  • Hong, Yu & Xie, Chengrui & Chen, Wanru & Luo, Xiang & Shi, Kaiqi & Wu, Tao, 2020. "Kinetic study of the pyrolysis of microalgae under nitrogen and CO2 atmosphere," Renewable Energy, Elsevier, vol. 145(C), pages 2159-2168.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:2159-2168
    DOI: 10.1016/j.renene.2019.07.135
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    Cited by:

    1. Xu, Donghua & Lin, Junhao & Ma, Rui & Fang, Lin & Sun, Shichang & Luo, Juan, 2022. "Microwave pyrolysis of biomass for low-oxygen bio-oil: Mechanisms of CO2-assisted in-situ deoxygenation," Renewable Energy, Elsevier, vol. 184(C), pages 124-133.
    2. Zhang, Congyu & Yang, Wu & Chen, Wei-Hsin & Ho, Shih-Hsin & Pétrissans, Anelie & Pétrissans, Mathieu, 2022. "Effect of torrefaction on the structure and reactivity of rice straw as well as life cycle assessment of torrefaction process," Energy, Elsevier, vol. 240(C).
    3. Vikraman, V. Karuppasamy & Boopathi, G. & Kumar, D. Praveen & Mythili, R. & Subramanian, P., 2021. "Non-isothermal pyrolytic kinetics of milk dust powder using thermogravimetric analysis," Renewable Energy, Elsevier, vol. 180(C), pages 838-849.
    4. Chakraborty, Sourabh & Dunford, Nurhan Turgut & Goad, Carla, 2021. "A kinetic study of microalgae, municipal sludge and cedar wood co-pyrolysis," Renewable Energy, Elsevier, vol. 165(P1), pages 514-524.
    5. Escalante, Jamin & Chen, Wei-Hsin & Tabatabaei, Meisam & Hoang, Anh Tuan & Kwon, Eilhann E. & Andrew Lin, Kun-Yi & Saravanakumar, Ayyadurai, 2022. "Pyrolysis of lignocellulosic, algal, plastic, and other biomass wastes for biofuel production and circular bioeconomy: A review of thermogravimetric analysis (TGA) approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 169(C).
    6. Zhang, Congyu & Ho, Shih-Hsin & Chen, Wei-Hsin & Wang, Rupeng, 2021. "Comparative indexes, fuel characterization and thermogravimetric- Fourier transform infrared spectrometer-mass spectrogram (TG-FTIR-MS) analysis of microalga Nannochloropsis Oceanica under oxidative a," Energy, Elsevier, vol. 230(C).

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