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Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal

[Image: see text] The molecular composition of organic matter formed during pyrolysis is complex. Fourier transform infrared spectroscopy (FTIR) is a good technique to investigate the coal chemical structural evolution. However, reports on the effects of chemical structure on the n-alkane yields and...

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Autores principales: Li, Wu, Zhu, Yan-Ming, Hu, Chang-Qing, Han, Sheng-Bo, Wu, Jin-Shui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424717/
https://www.ncbi.nlm.nih.gov/pubmed/32803063
http://dx.doi.org/10.1021/acsomega.0c02352
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author Li, Wu
Zhu, Yan-Ming
Hu, Chang-Qing
Han, Sheng-Bo
Wu, Jin-Shui
author_facet Li, Wu
Zhu, Yan-Ming
Hu, Chang-Qing
Han, Sheng-Bo
Wu, Jin-Shui
author_sort Li, Wu
collection PubMed
description [Image: see text] The molecular composition of organic matter formed during pyrolysis is complex. Fourier transform infrared spectroscopy (FTIR) is a good technique to investigate the coal chemical structural evolution. However, reports on the effects of chemical structure on the n-alkane yields and their relative functional groups are scarce in the literature. In our case, the chemical structural evolution process of bituminous coal obtained by pyrolysis at two different heating rates has been analyzed by pyrolysis-gas chromatography (Py-GC) and FTIR. Furthermore, some of the small molecular compounds (e.g., n-alkanes 24 can generate n-alkanes 20 or low-weight compounds) generated by gold-tube pyrolysis were identified using other GC techniques. Biomarkers were analyzed and compared to generated n-alkanes from the gold-tube pyrolysis experiments. We present the results of the relationship between the FTIR parameters and the molecular compositions that were analyzed. A good linear relationship can be seen between the FTIR parameters (C=O, C=C, and C-factor values), the carbon preference index (CPI), and the ratio of the pristane content and n-C(17) alkane content (Pr/n-C(17)). Furthermore, the n-alkane fraction of the pyrolysates, in particular pristane, phytane, n-C(17) alkane, and n-C(18) alkane, changed upon maturation. Our conclusions indicate that FTIR is applicable as a structural and chemical change probe to explore the pyrolysis process.
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spelling pubmed-74247172020-08-14 Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal Li, Wu Zhu, Yan-Ming Hu, Chang-Qing Han, Sheng-Bo Wu, Jin-Shui ACS Omega [Image: see text] The molecular composition of organic matter formed during pyrolysis is complex. Fourier transform infrared spectroscopy (FTIR) is a good technique to investigate the coal chemical structural evolution. However, reports on the effects of chemical structure on the n-alkane yields and their relative functional groups are scarce in the literature. In our case, the chemical structural evolution process of bituminous coal obtained by pyrolysis at two different heating rates has been analyzed by pyrolysis-gas chromatography (Py-GC) and FTIR. Furthermore, some of the small molecular compounds (e.g., n-alkanes 24 can generate n-alkanes 20 or low-weight compounds) generated by gold-tube pyrolysis were identified using other GC techniques. Biomarkers were analyzed and compared to generated n-alkanes from the gold-tube pyrolysis experiments. We present the results of the relationship between the FTIR parameters and the molecular compositions that were analyzed. A good linear relationship can be seen between the FTIR parameters (C=O, C=C, and C-factor values), the carbon preference index (CPI), and the ratio of the pristane content and n-C(17) alkane content (Pr/n-C(17)). Furthermore, the n-alkane fraction of the pyrolysates, in particular pristane, phytane, n-C(17) alkane, and n-C(18) alkane, changed upon maturation. Our conclusions indicate that FTIR is applicable as a structural and chemical change probe to explore the pyrolysis process. American Chemical Society 2020-07-27 /pmc/articles/PMC7424717/ /pubmed/32803063 http://dx.doi.org/10.1021/acsomega.0c02352 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Li, Wu
Zhu, Yan-Ming
Hu, Chang-Qing
Han, Sheng-Bo
Wu, Jin-Shui
Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title_full Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title_fullStr Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title_full_unstemmed Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title_short Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal
title_sort hydrocarbon generation and chemical structure evolution from confined pyrolysis of bituminous coal
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424717/
https://www.ncbi.nlm.nih.gov/pubmed/32803063
http://dx.doi.org/10.1021/acsomega.0c02352
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