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Evaluation of thermochemical properties of raw and extracted microalgae

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  • Ferreira, A.F.
  • Soares Dias, A.P.
  • Silva, C.M.
  • Costa, M.

Abstract

The thermochemical behavior of three raw and respective solvent extracted (ultrasound assisted) microalgae species – CV (Chlorella vulgaris), SC (Scenedesmus obliquus) and NOc (Nannochloropsis oculata) – was studied in order to evaluate their potential as fuels. Thermograms were obtained for four heating rates (5–25 °C/min). The results reveals that (i) for all microalgae thermal degradation processes of carbohydrates, lipids and proteins were observed for temperatures below 450 °C, while the char oxidation occurred for temperatures between 450 and 600 °C; (ii) the raw CV and SC required less energy to initiate the oxidation process than the raw NOc due to the higher amounts of lipids present in the latter microalgae; (iii) the extracted SC and NOc showed a behavior significantly different than the raw SC and NOc in the stages related to the lipids and proteins decomposition; (iv) the FTIR (Fourier transform infrared spectroscopy) spectra obtained for the raw and extracted microalgae showed significant differences in their oil and polysaccharides contents, revealing that ultrasound extraction using a mixture of n-hexane-isopropanol as solvent is adequate to extract these components from the microalgae studied; and (v) the calculated activation energy values are generally similar for the raw and extracted microalgae.

Suggested Citation

  • Ferreira, A.F. & Soares Dias, A.P. & Silva, C.M. & Costa, M., 2015. "Evaluation of thermochemical properties of raw and extracted microalgae," Energy, Elsevier, vol. 92(P3), pages 365-372.
    • Handle: RePEc:eee:energy:v:92:y:2015:i:p3:p:365-372
    DOI: 10.1016/j.energy.2015.04.078
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    References listed on IDEAS

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    1. López-González, D. & Fernandez-Lopez, M. & Valverde, J.L. & Sanchez-Silva, L., 2014. "Kinetic analysis and thermal characterization of the microalgae combustion process by thermal analysis coupled to mass spectrometry," Applied Energy, Elsevier, vol. 114(C), pages 227-237.
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    5. Chen, Yun-Chun & Chen, Wei-Hsin & Lin, Bo-Jhih & Chang, Jo-Shu & Ong, Hwai Chyuan, 2016. "Impact of torrefaction on the composition, structure and reactivity of a microalga residue," Applied Energy, Elsevier, vol. 181(C), pages 110-119.

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