Investigation of Pyrolysis Kinetics of Humic Acids from Low Rank Anatolian Coal by Thermal Analysis

Thermal analysis was used for the thermal characterization of the coal samples. The experiments were performed to study the pyrolysis and gasification kinetics of typical Mongolian brown coals. Low rank coals from Shivee ovoo, Ulaan ovoo, Aduun chuluun and Baganuur deposits have been investigated. Coal samples were heated in the thermogravimetric apparatus under argon at a temperature ranges of 25-1020ºC with heating rates of 10, 20, 30 and 40ºC/min. Thermogravimetry (TG) and derivative thermogravimetry (DTG) were performed to measure weight changes and rates of weight losses used for calculating the kinetic parameters. The activation energy (Ea) was calculated from the experimental results by using an Arrhenius type kinetic model.

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Non-isothermal TGA study on the combustion reaction kinetics and mechanism of low-rank coal char

RSC Advances ◽

10.1039/c8ra02618a ◽

2018 ◽

Vol 8 (41) ◽

pp. 22909-22916 ◽

Cited By ~ 15

Author(s):

Yingjie Hu ◽

Zhiqiang Wang ◽

Xingxing Cheng ◽

Chunyuan Ma

Keyword(s):

Thermal Analysis ◽

Reaction Kinetics ◽

Coal Char ◽

Kinetics And Mechanism ◽

Combustion Reaction ◽

Low Rank ◽

Low Rank Coal ◽

Pyrolytic Char ◽

Kinetics Of

The combustion reaction kinetics of pyrolytic char of low-rank coal was investigated by using thermal analysis technology.

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Pyrolysis Kinetics of Asphaltite by Thermal Analysis

Petroleum Science and Technology ◽

10.1080/10916460600705642 ◽

2006 ◽

Vol 24 (10) ◽

pp. 1233-1242 ◽

Cited By ~ 6

Author(s):

İffet Yakar Elbeyli

Keyword(s):

Thermal Analysis ◽

Pyrolysis Kinetics ◽

Kinetics Of

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Effects of Chemical Properties and Inherent Mineral Matters on Pyrolysis Kinetics of Low-Rank Coals

Processes ◽

10.3390/pr9122111 ◽

2021 ◽

Vol 9 (12) ◽

pp. 2111

Author(s):

Ziqi Zhu ◽

Rihong Cong ◽

Lingmei Zhou ◽

Hao Zheng ◽

Yanan Tu ◽

...

Keyword(s):

Chemical Properties ◽

Frequency Factor ◽

Theoretical Models ◽

Low Rank ◽

Pyrolysis Kinetics ◽

Clean Coal ◽

Pyrolysis Behavior ◽

Washing Process ◽

Kinetics Of ◽

Low Rank Coals

The kinetics during the pyrolysis process depend on both chemical structure and inherent mineral matters in coal, but normally, only one of these components is investigated in literature. In the present work, four low-rank coals were pyrolyzed in a thermogravimetric analyzer at a heating rate of 10 K/min in a constant nitrogen stream at a temperature up to 900 °C to study the pyrolysis behavior and kinetics. Two of the samples were raw coal (R-YL) and clean coal (C-YL) obtained through the washing process. The results showed that the coal-washing process mainly affected the inorganic part (mineral matters) and structure in coal, which did not largely change the chemical properties. The pyrolysis behavior in primary stage (before 550 °C) was mainly affected by the chemical properties of coal, while the pyrolysis behavior in higher temperature also depended on inherent mineral matters. The kinetics of four coals were obtained using the Coats–Redfern (CR) method with five theoretical models. The difference of E value was almost negligible for R-YL and C-YL, also showing that the coal-washing process did not largely change the chemical properties. The higher frequency factor A for clean coal C-YL showed a more porous structure due to the coal-washing process. The apparent activation energy E in the third stage was affected by the thermodynamic property of inherent minerals.

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Pyrolysis Kinetics of Low-Rank Coals Using Three Model-Free Methods

Solid Fuel Chemistry ◽

10.3103/s0361521921060094 ◽

2021 ◽

Vol 55 (6) ◽

pp. 439-443

Author(s):

Zhan-Ku Li ◽

Hai-Tao Wang ◽

Hong-Lei Yan ◽

Jing-Chong Yan ◽

Zhi-Ping Lei ◽

...

Keyword(s):

Low Rank ◽

Pyrolysis Kinetics ◽

Model Free ◽

Kinetics Of ◽

Low Rank Coals

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Pyrolysis Kinetics of Blends of Mengen Lignite with Denizli Peat

Energy Sources ◽

10.1080/00908310152004755 ◽

2001 ◽

Vol 23 (7) ◽

pp. 657-663 ◽

Cited By ~ 8

Author(s):

Yilser Güldoğan ◽

Tülay Durusoy ◽

Tijen Bozdemir

Keyword(s):

Pyrolysis Kinetics ◽

Kinetics Of

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Zeolites Fit For A Crown: Probing Host-Guest Interactions with Thermogravimetric Methods

10.26434/chemrxiv.7429961 ◽

2018 ◽

Author(s):

Asel Sartbaeva ◽

Paul R. Raithby ◽

Remi Castaing ◽

Antony Nearchou

Keyword(s):

Mass Spectrometry ◽

Thermal Analysis ◽

Differential Thermal Analysis ◽

Petrochemical Industry ◽

Rational Use ◽

New Methodologies ◽

First Time ◽

Kinetics Of

Through a combination of thermogravimetry, mass spectrometry and differential thermal analysis, we demonstrate for the first time that all four zeolites show experimental differences in their host-guest interactions with 18C6. In addition, we have estimated the kinetics of 18C6 decomposition, which is a technique that has not been applied to zeolites previously. Using these findings as a toolkit, a more rational use of OSDAs can be utilised to prepare designer zeolites. Furthermore, the new methodologies presented herein can be applied to current zeolites, such as MFI-type zeolites used in the petrochemical industry.

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Pyrolysis kinetics of moso bamboo

Wood and Fiber Science ◽

10.22382/wfs-2018-008 ◽

2018 ◽

Vol 50 (1) ◽

pp. 77-87 ◽

Cited By ~ 3

Author(s):

Ruijuan Wang ◽

Fang Liang ◽

Changle Jiang ◽

Zehui Jiang ◽

Jingxin Wang ◽

...

Keyword(s):

Moso Bamboo ◽

Pyrolysis Kinetics ◽

Kinetics Of

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Kinetics of temperature-programmed reactivation of a hydrodesulphurization catalyst

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19833340 ◽

1983 ◽

Vol 48 (12) ◽

pp. 3340-3355 ◽

Cited By ~ 2

Author(s):

Pavel Fott ◽

Pavel Šebesta

Keyword(s):

Carbon Dioxide ◽

Thermal Analysis ◽

Differential Thermal Analysis ◽

Thin Layer ◽

Kinetic Parameters ◽

Diffusion Region ◽

Reaction Heat ◽

Gaseous Products ◽

Temperature Programmed ◽

Kinetics Of

The kinetic parameters of reactivation of a carbonized hydrodesulphurization (HDS) catalyst by air were evaluated from combined thermogravimetric (TG) and differential thermal analysis (DTA) data. In addition, the gaseous products leaving a temperature-programmed reactor with a thin layer of catalyst were analyzed chromatographically. Two exothermic processes were found to take part in the reactivation, and their kinetics were described by 1st order equations. In the first process (180-400 °C), sulphur in Co and Mo sulphides is oxidized to sulphur dioxide; in the second process (300-540 °C), in which the essential portion of heat is produced, the deposited carbon is oxidized to give predominantly carbon dioxide. If the reaction heat is not removed efficiently enough, ignition of the catalyst takes place, which is associated with a transition to the diffusion region. The application of the obtained kinetic parameters to modelling a temperature-programmed reactivation is illustrated on the case of a single particle.

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