Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

Erschienen in: Cellulose 9/2020

09.04.2020 | Original Research

Mechanisms involved in thermal degradation of lignocellulosic fibers: a survey based on chemical composition

verfasst von: Heitor L. Ornaghi Jr., Felipe G. Ornaghi, Roberta M. Neves, Francisco Monticeli, Otávio Bianchi

Erschienen in: Cellulose | Ausgabe 9/2020

Einloggen, um Zugang zu erhalten
share
TEILEN

Abstract

The aim of this study was to determine the Arrhenius parameters and degradation mechanism for each component of biomass, including extractives, water, hemicellulose, cellulose and lignin. A statistical tool (F-test) was used as well as simulations of the effects of each component and the respective chars formed during thermal degradation. Experimental and theoretical curves for each component were simultaneously fitted, and the influence on the final thermal degradation curve was evaluated. Simulation of the TG curve was based on recently published models, for which one, two and three-step mechanisms were tested to complete the statistical evaluation. The activation energy showed a dependence on the cellulose and the reaction order on the hemicellulose polymer structures. On the other hand, lignin is the most complex material in biomass and thus a broader range of degradation mechanisms is associated with its char and this plays a significant role in the final “tail” of the TG curve. In the case of cellulose and hemicellulose, autocatalysis is the most probable degradation mechanism while for the respective chars it is diffusion. The char formation significantly increases the activation energy. The results of this study provide an insight into the chemistry involved in the pyrolysis of multicomponent biomass, which will facilitate the building of a prediction model.
Literatur
Zurück zum Zitat Boris VL (2001) The physical approach to the interpretation of the kinetics and mechanisms of thermal decomposition of solids: the state of the art. Thermochim Acta 373:97–124 CrossRef Boris VL (2001) The physical approach to the interpretation of the kinetics and mechanisms of thermal decomposition of solids: the state of the art. Thermochim Acta 373:97–124 CrossRef
Zurück zum Zitat Ornaghi HL, de Moraes ÁG, de O Poletto M et al (2016) Chemical composition, tensile properties and structural characterization of buriti fiber. Cell Chem Technol 50:15–22 Ornaghi HL, de Moraes ÁG, de O Poletto M et al (2016) Chemical composition, tensile properties and structural characterization of buriti fiber. Cell Chem Technol 50:15–22
Metadaten
Titel
Mechanisms involved in thermal degradation of lignocellulosic fibers: a survey based on chemical composition
verfasst von
Heitor L. Ornaghi Jr.
Felipe G. Ornaghi
Roberta M. Neves
Francisco Monticeli
Otávio Bianchi
Publikationsdatum
09.04.2020
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 9/2020
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-020-03132-7

Weitere Artikel der Ausgabe 9/2020

Cellulose 9/2020 Zur Ausgabe