Green coconut fiber thermal behaviour under the presence of a cobalt spinel catalyst

Felipe Z. R Monteiro1, Rogério N. C. Siqueira1, Francisco J. Moura1, Alexandre V. Grillo2


With increasing environmental concerns, much effort has been spent in research regarding development of sustainable processes for production of fuels and chemical products. In this context, hydrothermal liquefaction (HTL) has gained increasing attention, as a possible route for the chemical transformation of organic raw-materials, some sort of biomass, for example, into liquid oils at temperatures usually below 400°C, under moderate to high pressures (5 - 25 MPa), usually in the presence of a suitable catalyst. In the present work the thermogravimetric (TG) behavior under inert atmosphere of pure green coconut fiber and mixtures thereof with a spinel phase (Fe2CoO4), acting as catalyst has been studied. Spinel samples have been produced at 1000°C and different calcination times (3h, 6h and 9h). Both raw and synthesized materials were characterized  through different techniques, such as scanning electron microscopy (SEM), X-ray diffraction (XRD) and Infrared Absorption Spectroscopy (FTIR). According to the TG data, the catalyst produced during a calcination time of 9h showed a superior behavior regarding the lignin full thermal decomposition, which developed without fixed carbon formation. The results further suggest that the mixing process has a significant effect over the measured degradation kinetics, as it has a direct influence over the contact between catalyst and fibers. The kinetic modelling applied to the dynamic TG signal allowed a quantitative representation of the experimental data. The global process activation energy and order have proven to be respectively, 85.291 kJ / mol and 0.1227.

Full Text:



Camilo RL. Synthesis and characterization of magnetic nanoparticles of cobalt ferrite coated by 3-aminopropyltriethoxysilane for use as hybrid material in nanotechnology. PhD Thesis - Nuclear and Energy Research Institute. Polytechnic School, University of São Paulo, SP, 2006.

Carrijo OA; Liz RS; Makishima N, 2002. Fiber of green coconut as an agricultural substrate. Horticultura brasileira 20, 533-535;

Cartopassi WA.; Monteiro AP.; Braz ASA.; Santos EH., 2011. Use of nanoparticles of Cobalt Ferrite for the removal of oil on the surface of the water with swirling. Military Institute of Engineering, Rio de Janeiro, RJ.

Cortez lAB; Iora ES; Gómez EO, 2008. Biomass to energy, 12, 419-434, São Paulo: Unicamp.

Gonçalves NS, 2007. Use of powdered coconut water in the preparation of ferrite nanoparticles. Masters dissertation, UFC, Fortaleza, CE

Leite WC, 2012. Quality of the refinement of the Rietveld method in soil samples – State University of Ponta Grossa, UEPG. Ponta Grossa.

Limayem A; Ricke SC, 2012, Lignocellulosic Biomass for Bioethanol Production Current Perspectives, Potential Issues and Future Prospects. Progress in Energy & Combustion Science, 38, 449-467.

Raad TJ; Pinheiro PCC; Yoshida MI, 2006. General equation of kinetic mechanisms of carbonization of eucalyptus spp. Cerne, Lavras.

Rambo MKD; Rambo MCD; Rodriguez KJC; Alexandre GPA., 2015. Study of thermo-gravimetric analysis of different lignocellulosic biomass using principal component analysis. Ciência e Natura, Santa Maria 37, 862-86.

Raveendran K Ganesh A, Khilar KC, 1996. Pyrolisis characteristics of biomass and biomass components. Fuel 75, 987-998.

Rosa MDeF; Santos FJDeS; Montenegro AAT; Abreu FAPDe; Correia D; Araújo FBSDe; Norões ERDeV., 2001. Characterization of the powder of the green coconut shell used as an agricultural substrate. Fortaleza: embrapa agroindústria tropical.

Schena T, 2015, Pyrolysis of coconut husk fiber: characterization of the bio-oil before and after the application of two breeding processes. Federal University of Rio Grande do Sul, Rio Grande do Sul.

Siqueira RNC., Oliveira PF, 2014. Synthesis of Al2MnO4 spinel via H2 reduction. Tecnol. Metal. Mater. Miner., São Paulo, 163-170.

Spencer P, Ansara I, SGTE Casebook - Thermodynamics at work. Materials modeling series, London: Klaus Hack, (1996).

Speyer RF, 1994. Thermal Analysis of Materials. School of Materials Science and Engineering, Georgia Institute of Technology, Marcel Dekker, INC. New York.

Tomczak F; Sydenstricker THD; Satyanarayana KG, 2007. Studies on lignocellulosic fibers of Brazil. Part II: Morphology and properties of brazilian coconut fibers. Composites Part A-Applied Science and Manufacturing 38, 1710-1721.

Yang H, Yan R., Chen H., Lee DH., Zheng C, 2007. Characteristics of hemicellulose, cellulose and lignin pyrolysis. Fuel 86, 1781-1788.

Kumar S, Selvarajoo A, 2015, Feedforward Neural Network Modeling of Biomass Pyrolysis Process for Biochar Production, Computer Aided Chemical Engineering, 45, 1681-1686.



  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License

This site is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.