Alteration of physico-chemical characteristics of coconut endocarp — Acrocomia aculeata — by isothermal pyrolysis in the range 250–550 °C

Shirley Duarte 1 Pin Lv 2 Giana Almeida 3 Juan Carlos Rolón 1 Patrick Perre 2
1 UNA - Universidad Nacional de Asunción [Paraguay]
2 LGPM - Laboratoire de Génie des Procédés et Matériaux - EA 4038
3 GENIAL - Ingénierie, Procédés, Aliments
Abstract : Characteristics of the endocarp of Acrocomia aculeata fruit samples were evaluated before and after 2 h of isothermal pyrolysis in the range 250-550 degrees C. Differential thermogravimetric (DTG) curves from the char, obtained at 300 degrees C, confirm that degradation of hemicellulose and cellulose was complete and resulted in approximately 42.5% oxygen loss. The micrographs obtained from scanning electron microscopy with a field emission gun (SEM/FEG) confirmed a softened phase from the chars treated at 250 degrees C. The van Krevelen analysis shows that energy intensification of the sample transferred from peat to charcoal as the treatment intensity increased; this resulted in a 71% mass loss at 550 degrees C. The surface area of the treated sample increased exponentially with a factor of 1.2 per percentage of mass loss, from 450 degrees C and reached 216 m(2)/g at 550 degrees C as a consequence of the development of microporous structures. The water-vapor-sorption properties were strongly affected by the treatment, with a pronounced type V isotherm curve for the char at 550 degrees C. These results show the evolution in chemical and structural properties of coconut endocarp during its isothermal pyrolysis. In particular, the improved char properties indicate that this material may be used as solid fuel or as raw material for the gasification process.
Keywords : Pyrolysis mechanism Coconut endocarp Dynamic vapor sorption Elemental analysis elemental analysis coconut endocarp pyrolysis mechanism surface area dynamic vapor sorption
Document type :
Journal articles
Complete list of metadatas
https://hal-centralesupelec.archives-ouvertes.fr/hal-01652581
Contributor : Catherine Kruch <>
Submitted on : Friday, December 1, 2017 - 2:52:30 PM
Last modification on : Thursday, February 28, 2019 - 5:42:43 PM

File

Shirley Perré 2017 (1).pdf
Files produced by the author(s)

Identifiers

Collections

CENTRALESUPELEC | AGROPARISTECH | INRA | LGPM | UNIV-PARIS-SACLAY | UNIV-HESAM | GENIAL

Citation

Shirley Duarte, Pin Lv, Giana Almeida, Juan Carlos Rolón, Patrick Perre. Alteration of physico-chemical characteristics of coconut endocarp — Acrocomia aculeata — by isothermal pyrolysis in the range 250–550 °C. Journal of Analytical and Applied Pyrolysis, Elsevier, 2017, 126, pp.88-98. ⟨10.1016/j.jaap.2017.06.021⟩. ⟨hal-01652581⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

389

Files downloads

207

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD