Header menu link for other important links
X
Apparent Kinetics of Fast Pyrolysis of Four Different Microalgae and Product Analyses Using Pyrolysis-FTIR and Pyrolysis-GC/MS
Ribhu Gautam, Akash Kiran Varma,
Published in American Chemical Society
2017
Volume: 31
   
Issue: 11
Pages: 12339 - 12349
Abstract
This study reports an experimental technique to obtain the isothermal mass loss profiles of four different microalgae (Chlorella vulgaris, Nannochlorpsis oculata, Schizochytrium limacinum, and Arthrospira platensis) under fast pyrolysis conditions in the temperature range of 400-700 °C at short residence times of 2-60 s using an analytical pyrolyzer. The microalgae investigated in this study vary significantly, based on elemental and biochemical composition. The apparent kinetic parameters of fast pyrolysis of the algae were evaluated using first-order and multidimensional diffusion models. The apparent activation energy and pre-exponential factor evaluated under fast heating rate conditions were lower compared to those reported under slow pyrolysis conditions, which is attributed to the diffusion effects. The rate parameters were validated by constructing a kinetic compensation plot, which showed that ln(A) = 0.19Ea + 0.43. The product time evolution at short time scales was studied using in situ Fourier transform infrared spectroscopy, and a majority of the functional groups evolved in the range of 5-12 s. The evolution of C=O and aliphatic C-H stretching vibrations for lipid-rich algae was slow, compared to that for protein-rich algae. The pyrolysates were characterized using gas chromatography/mass spectrometry, and the yield of nitrogen-containing organics followed a linear trend with the elemental nitrogen content in the algae. © 2017 American Chemical Society.
About the journal
JournalData powered by TypesetEnergy and Fuels
PublisherData powered by TypesetAmerican Chemical Society
ISSN08870624
Open AccessNo
Concepts (17)
  •  related image
    Activation energy
  •  related image
    Algae
  •  related image
    Fourier transform infrared spectroscopy
  •  related image
    Gas chromatography
  •  related image
    Kinetics
  •  related image
    Microorganisms
  •  related image
    Nitrogen
  •  related image
    Stretching
  •  related image
    Apparent activation energy
  •  related image
    APPARENT KINETIC PARAMETERS
  •  related image
    ARTHROSPIRA PLATENSIS
  •  related image
    BIOCHEMICAL COMPOSITION
  •  related image
    Experimental techniques
  •  related image
    GAS CHROMATOGRAPHY/MASS SPECTROMETRY
  •  related image
    HEATING RATE CONDITIONS
  •  related image
    Stretching vibrations
  •  related image
    Pyrolysis