TY - JOUR
T1 - Thermogravimetric characterisation and kinetic analysis of Nannochloropsis sp. and Tetraselmis sp. microalgae for pyrolysis, combustion and oxy-combustion
AU - Dessi, Federica
AU - Mureddu, Mauro
AU - Ferrara, Francesca
AU - Fermoso, Javier
AU - Orsini, Alessandro
AU - Sanna, Aimaro
AU - Pettinau, Alberto
N1 - Funding Information:
The Sotacarbo contribution in this work has been carried out within the “Centre of Excellence on Clean Energy” research project (D83C17000370002) led by Sotacarbo and funded by the Regional Government of Sardinia ( FSC 2014–2020 ).
Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/2/15
Y1 - 2021/2/15
N2 - This paper reports the results of a complete kinetic study, based on thermogravimetric characterisation, to compare the performance of Nannochloropsis sp. and Tetraselmis sp. microalgae during pyrolysis and combustion with air, enriched air and oxygen. The analysis has been carried out including both the single- and multi-step approach studying the effect of different model-free methods and heating rates. In addition, the study brings together the pseudo-components (obtained by peaks deconvolution) model and master plot methodology to discriminate the kinetic model followed by the different processes with the aim to determine the kinetic triplet (activation energy, reaction order and pre-exponential factor). It results that the thermal decomposition of the microalgae cannot be represented by a single reaction mechanism for the whole conversion range, but several parallel decomposition reactions have been taken into account, and the kinetics have been assessed from each decomposition kinetic of the pseudo-components. The kinetic profiles can be interpreted as the combined effects of reaction-order (F), nucleation (A), exponential nucleation (P) and geometrical contraction (R) mechanisms.
AB - This paper reports the results of a complete kinetic study, based on thermogravimetric characterisation, to compare the performance of Nannochloropsis sp. and Tetraselmis sp. microalgae during pyrolysis and combustion with air, enriched air and oxygen. The analysis has been carried out including both the single- and multi-step approach studying the effect of different model-free methods and heating rates. In addition, the study brings together the pseudo-components (obtained by peaks deconvolution) model and master plot methodology to discriminate the kinetic model followed by the different processes with the aim to determine the kinetic triplet (activation energy, reaction order and pre-exponential factor). It results that the thermal decomposition of the microalgae cannot be represented by a single reaction mechanism for the whole conversion range, but several parallel decomposition reactions have been taken into account, and the kinetics have been assessed from each decomposition kinetic of the pseudo-components. The kinetic profiles can be interpreted as the combined effects of reaction-order (F), nucleation (A), exponential nucleation (P) and geometrical contraction (R) mechanisms.
KW - Kinetic analysis
KW - Microalgae
KW - Nannochloropsis
KW - Tetraselmis
KW - Thermogravimetric analysis
UR - http://www.scopus.com/inward/record.url?scp=85096994269&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2020.119394
DO - 10.1016/j.energy.2020.119394
M3 - Article
SN - 0360-5442
VL - 217
JO - Energy
JF - Energy
M1 - 119394
ER -