Thermal behavior and kinetic study on the pyrolysis of Shenfu coal by sectioning method

Du, Rui-Rui; Wu, Keng; Zhang, Li; She, Yuan; Xu, Dongkui; Chao, Changyao; Xuanke, Qin; Zhang, Bing

doi:10.1007/s10973-016-5475-x

Cited by 18 publications

(4 citation statements)

References 20 publications

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“…5, 10 and 20°C was obtained in DTG curves (5-95 %). In addition, the kinetic parameters can be conventionally expressed with the extent of triplet TG curves, because three or more curves contribute to the measured data and also to reproduce the kinetic data [12][13][14][15][16][18][19][20][21]. The values of the correlation coefficient (r) and activation energy (E a ) are listed in Table 1.…”

Section: Kinetic Methodologymentioning

confidence: 99%

Synthesis and evaluation of the thermal behavior of flavonoids

Ferreira

Kobelnik

Regasini

et al. 2016

J Therm Anal Calorim

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Flavonoids in the broad sense of the term are virtually universal plant pigments. Synthesis of flavanone and 6-hydroxyflavanone was carried out and identified by H and C NMR. Details concerning the thermal behavior were evaluated by thermogravimetry under oxygen and nitrogen purge gases. Additionally, the kinetic studies were evaluated from several heating rates (5, 10 and 20°C min -1 ) and sample mass of 2 mg in open crucibles. The obtained data were evaluated with the isoconversional method, where the values of activation energy (E a /kJ mol -1 ) were plotted in function of the conversion degree (a). The results of thermal behavior of the flavanone under a nitrogen purge gas showed that this compound has a homogeneous degradation process while the hydroxyl group in the aromatic ring of 6-hydroxyflavanone there are two mass losses.

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Section: Kinetic Methodologymentioning

confidence: 99%

Synthesis and evaluation of the thermal behavior of flavonoids

Ferreira

Kobelnik

Regasini

et al. 2016

J Therm Anal Calorim

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“…It is important to note that this Committee suggests three or more curves, because it has been considered that statistics require three minimal quantities of TG curves. We also consider being appropriate to use more than one sample mass and also purge gas to promote a better interpretation of kinetic data as much as possible, as carried out in others works, where was possible to see the results obtained with different conditions of analysis [18][19][20][21].…”

Section: Lipid Profilementioning

confidence: 99%

Evaluation of thermal behavior and chromatographic characterization of oil extracted from seed of Pittosporum undulatum

Kobelnik

Fontanari

Ribeiro

et al. 2017

J Therm Anal Calorim

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The composition of the oil extracted from sweet pittosporum was studied by chromatography analyses. The sweet pittosporum (Pittosporum undulatum) is native to eastern parts of Australia. It is a tree growing to 15 m tall with wavy (undulating) leaf edges and also has attractive fragrant flowers, sweet pittosporum and is found in southern Brazil. The chromatographic profile of this oil reveals a predominance of unsaturated fatty acids, in particular, 28.86% of cis-11-eicosenoic acid (C20:1), 31.44% of eicosatrienoic acid (C20:3n3), 6.61% of docosahexaenoic acid (C22:6n3) and 24.32% of oleic acid (C18:1n9). This oil was characterized by differential scanning calorimetry (DSC), from 100 to-80°C and subsequently heated from-80°C up to 100°C, both at cooling/heating rate of 1 and 10°C min-1. Thermogravimetry (TG) and differential thermal analysis (DTA) in nitrogen and oxygen purge gases under different heating rates show oil stability. The analysis carried out by DSC indicates that this oil has two crystallization peaks under cooling condition. Simultaneous TG-DTA curves show that the behavior of this oil shows variation among the heating rates, with a sudden combustion. The kinetic behavior showed the relationship between the uses of two sample masses, with good parameter and high correlation coefficients (r).

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“…According to TGA, Geng et al 18 reported that the pyrolysis process of Shenmu bituminous coal involved many types of covalent and other chemical bonds, resulting in the fact that the cleavage of each bond needs different activation energies. Du et al 19 reported the pyrolysis kinetics of Shenfu coal, and the pyrolysis process could be divided into three stages. The low-temperature stage was contributed by small molecules of gas and water, and a large amount of gas and tar were evaporated in the middle-temperature region.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Kinetic Analysis of Sequential Extract Residues from Hefeng Subbituminous Coal Based on the Coats-Redfern Method

Huang

et al. 2022

ACS Omega

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Sequential extract residues (R i , i = 1, 2, 3, 4, and 5) were obtained from Hefeng acid-washing coal (HF AC ) by petroleum ether, carbon disulfide, methanol, acetone, and isometric carbon disulfide/acetone mixture, sequentially. Pyrolysis behavior of the residues was determined using thermogravimetry analysis. The Coats–Redfern method with different reaction orders was used to analyze the pyrolysis kinetic of each sample, and the kinetic parameters, including correlation coefficient ( R 2 ), activation energy ( E ), and pre-exponential factor ( A ), were calculated. Results showed that the weight loss of extract residues was higher than HF AC , and pyrolysis behavior varies greatly for residues, which is related to the unstable structure after extraction. From conversion–temperature (α– T ) curves, the pyrolysis process was divided into three stages: low-temperature stage (150–350 °C), medium-temperature stage (350–550 °C), and high-temperature stage (550–950 °C). The medium-temperature stage made great contribution to the process of pyrolysis, which was dominated by depolymerization and decomposition reaction. The relationship between kinetic parameters and reaction order showed that the swelling effect is an important reason for the discrepancy of E for each sample in the process of pyrolysis.

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Thermal behavior and kinetic study on the pyrolysis of Shenfu coal by sectioning method

Cited by 18 publications

References 20 publications

Synthesis and evaluation of the thermal behavior of flavonoids

Synthesis and evaluation of the thermal behavior of flavonoids

Evaluation of thermal behavior and chromatographic characterization of oil extracted from seed of Pittosporum undulatum

Pyrolysis Kinetic Analysis of Sequential Extract Residues from Hefeng Subbituminous Coal Based on the Coats-Redfern Method

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