The facts and hypotheses relating to the phenomenological model of cellulose pyrolysis

Mamleev, Vadim; Bourbigot, Serge; Bras, Michel Le; Yvon, Jacques

doi:10.1016/j.jaap.2008.10.014

Cited by 193 publications

(179 citation statements)

References 75 publications

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“…Decomposition proceeds through a reaction network consisting of parallel and competitive reactions (Varhegyi et al 1989;Antal and Varhegyi 1995;Mamleev et al 2007a;Mamleev et al 2007b;Mamleev et al 2009;Shen and Gu 2009). Single-step (Varhegyi et al 1994;Antal et al 1998) and multistep (Bradbury et al 1979;Agrawal 1988a;Agrawal 1988b) models have been proposed to describe the kinetics of cellulose decomposition.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Thermal Degradation of Cellulose: Analysis Based on Isothermal and Linear Heating Data

López-Beceiro¹,

Álvarez-García²,

Sebio-Puñal³

et al. 2016

BioResources

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In spite of the many studies performed, there is not yet a kinetic model to predict the thermal degradation of cellulose in isothermal and nonisothermal conditions for the full extent of conversion. A model proposed by the authors was tested on non-oxidising thermogravimetric data. The method consisted of initially fitting several isothermal and non-isothermal curves, then obtaining a critical temperature and an energy barrier from the set of fittings that resulted from different experimental conditions. While the critical temperature, approximately 226 °C, represented the minimum temperature for the degradation process, the degradation rate at a given temperature was related to both the critical temperature and the energy barrier. These results were compared with those observed in other materials. The quality of fittings obtained was superior to any other reported to date, and the results obtained from each single curve were in line with each other. The peak area. Represents the amount of sample involved in each transformation process, in linear heating conditions Fitting parameter, related to the peak shape in linear heating conditions. If =1, then is 4 times the maximum transformation rate per unit of sample mass KeywordsThe time elapsed from the beginning of the experiment to the instant where the maximum mass loss rate is observed, in linear heating experiments Fitting parameter related to the peak asymmetry ( =1 for a symmetric peak) yiso(t) Transformation rate, as a function of time, in isothermal conditionsThe peak area. Represents the amount of sample involved in each transformation process, in isothermal conditions

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Section: Introductionmentioning

confidence: 99%

Kinetics of Thermal Degradation of Cellulose: Analysis Based on Isothermal and Linear Heating Data

López-Beceiro¹,

Álvarez-García²,

Sebio-Puñal³

et al. 2016

BioResources

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“…Pakhomov [75] suggested a free-radical mechanism for the release of levoglucosan during the thermal decomposition of cellulose in vacuum. It is not agreed in the literature, whether the initial scission occurs within the chain [75] or at the chain end [47]. Scheme 3-1 shows a free radical mechanism with the chain scission of the macromolecule.…”

Section: Cellulose Decompositionmentioning

confidence: 98%

“…Recently Kwon et al [46] reported even 70% levoglucosan yield in a continuous-feed pyrolyzer at 450°C with rapid cooling under reduced pressure of air. According to Mamleev et al [47], the optimal temperature for the production of maximum yield of levoglucosan is 310-340°C. Apparently this temperature is in agreement with the thermogravimetric results on cellulose decomposition [48].…”

Section: Pyrolysis Of Macromolecular Biomass Constituentsmentioning

confidence: 99%

Analytical Techniques as a Tool to Understand the Reaction Mechanism

Jakab

2015

Recent Advances in Thermo-Chemical Conversion of Biomass

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“…Mamleev et al [47] suggested a two-level kinetic model for cellulose pyrolysis. According to the hypothesis, tar and volatile acids are released during the first transglycosylation step due to the decomposition of the non-reducing chain ends.…”

Section: Cellulose Decompositionmentioning

confidence: 99%