Impact of pressure on the carbon structure of char during pyrolysis of bituminous coal in pressurized entrained-flow reactor

The impact of pressure on the carbon structure of a Chinese bituminous coal was investigated using a pressurized entrained-flow reactor in the temperature and pressure ranges of 700-900 °C and 0.1-4.0MPa, respectively. Pyrolysis pressure had a significant influence on the physiochemical and carbon s...

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Bibliographic Details
Published in:The Korean journal of chemical engineering 2019, 36(3), 228, pp.393-403
Main Authors: Tahmasebi, Arash, Maliutina, Kristina, Yu, Jianglong
Format: Article
Language:English
Subjects:
Biotechnology
Bituminous coal
Carbon
Catalysis
Chemistry
Chemistry and Materials Science
Energy
Entrainment
Fourier transforms
Functional groups
Graphene
Industrial Chemistry/Chemical Engineering
Infrared analysis
Interlayers
Materials Science
Physiochemistry
Pyrolysis
Raman spectroscopy
Spectroscopic analysis
Spectrum analysis
Swelling ratio
X-ray diffraction
화학공학
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Summary:The impact of pressure on the carbon structure of a Chinese bituminous coal was investigated using a pressurized entrained-flow reactor in the temperature and pressure ranges of 700-900 °C and 0.1-4.0MPa, respectively. Pyrolysis pressure had a significant influence on the physiochemical and carbon structure of chars. The specific surface area and the swelling ratio of chars reached their highest values at 1.0MPa. Fourier transform infrared spectroscopy (FTIR) analysis showed that higher pressures enhanced the decomposition of functional groups in chars. Raman spectroscopy analysis results revealed that at elevated pressures, the organic matrix and functional groups were removed from the char structure, leading to higher ordering of the carbon structure. During X-ray diffraction (XRD) analysis, parameters such as the stacking height (L c ), interlayer spacing (d 002 ) and lateral size of the graphite structures (L a ) were used to evaluate the graphitic structures in chars. The results showed an increase in L c , L a , and the average number of graphene sheets with pyrolysis pressure, indicating a more ordered carbon structure at elevated pressures. The d -spacing of char was in the range of 3.34-3.37 Å, similar to typical graphitic structures.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-018-0187-5