View in EDS

Study on the co-pyrolysis behavior of coking coal and semicoke and the carbon structure of pyrolysis char.

Saved in:
Bibliographic Details
Title: Study on the co-pyrolysis behavior of coking coal and semicoke and the carbon structure of pyrolysis char.
Authors: Xu, Jing1 (AUTHOR) tohsakarinjing@gmail.com, Ma, Wenna1 (AUTHOR), Lu, Yawei1 (AUTHOR), Zhang, Xiaoyong2 (AUTHOR), Zhang, Dailin2 (AUTHOR) agdzdl@ahut.edu.cn
Source: Fullerenes, Nanotubes & Carbon Nanostructures. 2026, Vol. 34 Issue 7, p804-813. 10p.
Subjects: Pyrolysis kinetics, Coking coal, Carbon-based materials, X-ray powder diffraction, Coal carbonization, Raman spectroscopy, Pyrolysis, Activation energy
Abstract: Pyrolysis kinetics is an important tool for studying the coal pyrolysis process. In this study, a large-capacity thermogravimetric instrument was used to investigate the co-pyrolysis behavior of coking coal and semicoke. The effect of adding different proportions of semicoke on the kinetic and thermodynamic parameters of coal pyrolysis was calculated using the isoconversional method. In addition, XRD and Raman spectroscopy were used to investigate changes in the microcrystalline structure of the co-pyrolyzed char, providing guidance for the application of semicoke in the coking industry. Kinetic analysis indicates that at high degree of conversion (α > 0.5), semicoke has a higher activation energy than coking coal, while at low degree of conversion (α < 0.5), semicoke has a lower activation energy. This is primarily because semicoke is a product of low-temperature pyrolysis, featuring a higher fixed carbon content and lower volatile matter content. Additionally, semicoke has a higher specific surface area than coking coal, enabling it to adsorb more water and gas molecules. The activation energy required for the thermal decomposition and release of water and low-molecular-weight gases is lower; At high degree of conversion, the main process involves the release of large-molecule tar. Since semicoke is a product of low-temperature pyrolysis, further release of volatile matter requires higher activation energy. XRD and Raman spectroscopy studies show that as the proportion of semicoke increases, the microcrystalline structure of pyrolysis char develops in a more orderly direction. [ABSTRACT FROM AUTHOR]
Copyright of Fullerenes, Nanotubes & Carbon Nanostructures is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Pyrolysis kinetics is an important tool for studying the coal pyrolysis process. In this study, a large-capacity thermogravimetric instrument was used to investigate the co-pyrolysis behavior of coking coal and semicoke. The effect of adding different proportions of semicoke on the kinetic and thermodynamic parameters of coal pyrolysis was calculated using the isoconversional method. In addition, XRD and Raman spectroscopy were used to investigate changes in the microcrystalline structure of the co-pyrolyzed char, providing guidance for the application of semicoke in the coking industry. Kinetic analysis indicates that at high degree of conversion (α > 0.5), semicoke has a higher activation energy than coking coal, while at low degree of conversion (α < 0.5), semicoke has a lower activation energy. This is primarily because semicoke is a product of low-temperature pyrolysis, featuring a higher fixed carbon content and lower volatile matter content. Additionally, semicoke has a higher specific surface area than coking coal, enabling it to adsorb more water and gas molecules. The activation energy required for the thermal decomposition and release of water and low-molecular-weight gases is lower; At high degree of conversion, the main process involves the release of large-molecule tar. Since semicoke is a product of low-temperature pyrolysis, further release of volatile matter requires higher activation energy. XRD and Raman spectroscopy studies show that as the proportion of semicoke increases, the microcrystalline structure of pyrolysis char develops in a more orderly direction. [ABSTRACT FROM AUTHOR]
ISSN:1536383X
DOI:10.1080/1536383X.2025.2584459