Experimental and kinetic modelling investigation on the effects of crystallinity on cellulose pyrolysis

Leng, Erwei; Ferreiro, Ana Isabel; Liu, T.; Gong, Xun; Costa, Mário; Li, X.; Xu, Minghou

doi:10.1016/j.jaap.2020.104863

Cited by 16 publications

(4 citation statements)

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“…It was speculated that the level of crystallinity and DP may govern the thermal stability (Mukarakate et al 2016;Mattonai et al 2018;Shojaeiarani et al 2019;Leng et al 2020). In view of the results that the crystallinity and the average DP of cellulose esters have been significantly changed compared with neat cellulose in this study, the thermal decomposition of the samples was investigated via TGA within a temperature range of 50 to 720 °C under a nitrogen atmosphere (Fig.…”

Section: Thermal Stability Of Betaine-modified Cellulosementioning

confidence: 98%

Esterification of cellulose with betaine using p-toluenesulfonyl chloride for the in-situ activation of betaine

Liu

Wang

Sun

2021

BioRes

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A novel synthesis method was developed for betaine-modified cellulose ester using a mixed N,N-dimethylacetamide/lithium chloride solvent system; p-toluenesulfonyl chloride was used for the in-situ activation of the betaine. The influence of the reaction temperature and time, as well as the anhydroglucose unit to p-toluenesulfonyl chloride to betaine mass ratio on the degree of substitution of the product was evaluated. Increasing the proportion of betaine and p-toluenesulfonyl chloride was beneficial to the esterification reaction. The degree of substitution was 1.68 at 90 °C for 32 h with an anhydroglucose unit to p-toluenesulfonyl chloride to betaine molar ratio of 1 to 2 to 3. The physicochemical properties of the betaine-modified cellulose were closely related to the degree of substitution. Major changes in the morphologies, crystallinity, thermal properties, porosity, and the average degree of polymerization resulted from the modification. The introduction of betaine made cellulose esters thermally less stable than neat cellulose but more difficult to completely degrade. The crystalline structure of the cellulose esters was destroyed, and the products exhibited a porous nature. Dye sorption studies demonstrated that the betaine-modified cellulose holds the potential of adsorbing anionic substances, which is the premise of its application.

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Section: Thermal Stability Of Betaine-modified Cellulosementioning

confidence: 98%

Esterification of cellulose with betaine using p-toluenesulfonyl chloride for the in-situ activation of betaine

Liu

Wang

Sun

2021

BioRes

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“…The difference in hemicellulose structure may be one of the reasons for the various thermal stabilities between eucalyptus and bamboo (Werner et al, 2014). In addition, the temperature of the maximum weight loss rate in the DTG curves was reduced with the reduction of cellulose crystallinity, which may be due to the reason that the lower crystallinity of cellulose has less number of hydrogen bonds needed to be broken (Leng et al, 2020).…”

Section: Catalytic Pyrolysis Behaviormentioning

confidence: 99%

A Comprehensive Study on the Dynamic Change of Thermal Behavior During Lignocellulose Pyrolysis Catalyzed by Plant-Rich Metallic Elements

et al. 2021

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Evaluating the pyrolysis of lignocellulose via theoretical and computational approaches is of great importance for the efficient utilization of biomass. In this work, the dynamic changes in physicochemical properties of eucalyptus and bamboo during plant-rich metallic element-catalyzed pyrolysis process were investigated, and their thermal decomposition behaviors were explored by kinetic analysis. Results showed that the metal absorption capacity and thermal stability of eucalyptus were better than those of bamboo. The temperatures corresponding to the initial devolatilization and the highest weight loss value of eucalyptus/bamboo decreased in the catalysis order of Mg > Fe > Ca > Cu > K > Na. Fourier-transform infrared (FT-IR) results showed that the thermal stability of ester bond of glucuronoarabinoxylan was higher than that of acetyl groups. The maximum weight loss rate could be observed for samples with the lowest metal-loaded concentration (5%). Moreover, Mg and Fe presented the better catalytic performance for facilitating the lignocellulose pyrolysis in comparison with other investigated metallic elements.

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“…Thermal degradation of cellulose has been of interest for a longtime. A number of studies were focused on thermal degradation kinetics of cellulose, hemicellulose, and lignin [5][6][7][8][9][10][11][12][13][14]. As described for other materials, in open system, the initial water content should not affect the decomposition temperature if all water had evaporated from samples prior to reaching the decomposition temperature [15].…”

Section: Introductionmentioning

confidence: 99%

A Logistic Approach for Kinetics of Isothermal Pyrolysis of Cellulose

López-Beceiro¹,

Díaz-Díaz²,

Álvarez-García³

et al. 2021

Processes

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A kinetic model is proposed to fit isothermal thermogravimetric data obtained from cellulose in an inert atmosphere at different temperatures. The method used here to evaluate the model involves two steps: (1) fitting of single time-derivative thermogravimetric curves (DTG) obtained at different temperatures versus time, and (2) fitting of the rate parameter values obtained at different temperatures versus temperature. The first step makes use of derivative of logistic functions. For the second step, the dependence of the rate factor on temperature is evaluated. That separation of the curve fitting from the analysis of the rate factor resulted to be very flexible since it proved to work for previous crystallization studies and now for thermal degradation of cellulose.

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Experimental and kinetic modelling investigation on the effects of crystallinity on cellulose pyrolysis

Cited by 16 publications

References 50 publications

Esterification of cellulose with betaine using p-toluenesulfonyl chloride for the in-situ activation of betaine

Esterification of cellulose with betaine using p-toluenesulfonyl chloride for the in-situ activation of betaine

A Comprehensive Study on the Dynamic Change of Thermal Behavior During Lignocellulose Pyrolysis Catalyzed by Plant-Rich Metallic Elements

A Logistic Approach for Kinetics of Isothermal Pyrolysis of Cellulose

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