Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations
Abstract
Conversion mechanisms of carbonaceous materials during controlled pyrolysis under high temperature currently rely on empirical understanding, rather than a detailed atomistic description of the underlying chemical evolution. Here in this work, a series of molecular dynamics simulations, based on reactive force fields, were performed to probe the structural evolutions of small aromatic (number of aromatic rings ≤4) mixtures under extreme conditions (temperature 3000–4000 K). For any temperature studied and independent of the presence of alkane radicals, three major gas-phase byproducts, H2, C2H2, and C2H4, were found in bulk treated by rapid heating. Temperatures as well as alkane addition can affect the production/consumption rates and fractionation of these gas species. Compared to alkane radicals, temperatures also play important roles in modulating the initial growth pathways of solid carbon clusters. At 3000 K, aromatic carbon cluster formation is mainly initiated through the direct combination of aryl radicals. Conversely, at 4000K, carbon cluster formation is initiated by the assembly of chained radicals, since substantial polyacetylenic chains were produced. Through cross comparison on different simulation models/methods, as well as with experiments, the effect of processing conditions on carbonaceous materials conversion was revealed, and underlying mechanisms responsible for the observed phenomena are proposed.
- Authors:
-
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- ExxonMobil Research and Engineering Co, Annandale, NJ (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Natural Sciences and Engineering Research Council of Canada (NSERC); ExxonMobil
- OSTI Identifier:
- 1577724
- Alternate Identifier(s):
- OSTI ID: 1560324
- Grant/Contract Number:
- EM09079
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Carbon
- Additional Journal Information:
- Journal Volume: 155; Journal Issue: C; Journal ID: ISSN 0008-6223
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Jian, Cuiying, Merchant, Shamel, Zang, Xining, Ferralis, Nicola, and Grossman, Jeffrey C. Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations. United States: N. p., 2019.
Web. doi:10.1016/j.carbon.2019.08.048.
Jian, Cuiying, Merchant, Shamel, Zang, Xining, Ferralis, Nicola, & Grossman, Jeffrey C. Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations. United States. https://doi.org/10.1016/j.carbon.2019.08.048
Jian, Cuiying, Merchant, Shamel, Zang, Xining, Ferralis, Nicola, and Grossman, Jeffrey C. Fri .
"Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations". United States. https://doi.org/10.1016/j.carbon.2019.08.048. https://www.osti.gov/servlets/purl/1577724.
@article{osti_1577724,
title = {Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations},
author = {Jian, Cuiying and Merchant, Shamel and Zang, Xining and Ferralis, Nicola and Grossman, Jeffrey C.},
abstractNote = {Conversion mechanisms of carbonaceous materials during controlled pyrolysis under high temperature currently rely on empirical understanding, rather than a detailed atomistic description of the underlying chemical evolution. Here in this work, a series of molecular dynamics simulations, based on reactive force fields, were performed to probe the structural evolutions of small aromatic (number of aromatic rings ≤4) mixtures under extreme conditions (temperature 3000–4000 K). For any temperature studied and independent of the presence of alkane radicals, three major gas-phase byproducts, H2, C2H2, and C2H4, were found in bulk treated by rapid heating. Temperatures as well as alkane addition can affect the production/consumption rates and fractionation of these gas species. Compared to alkane radicals, temperatures also play important roles in modulating the initial growth pathways of solid carbon clusters. At 3000 K, aromatic carbon cluster formation is mainly initiated through the direct combination of aryl radicals. Conversely, at 4000K, carbon cluster formation is initiated by the assembly of chained radicals, since substantial polyacetylenic chains were produced. Through cross comparison on different simulation models/methods, as well as with experiments, the effect of processing conditions on carbonaceous materials conversion was revealed, and underlying mechanisms responsible for the observed phenomena are proposed.},
doi = {10.1016/j.carbon.2019.08.048},
journal = {Carbon},
number = C,
volume = 155,
place = {United States},
year = {Fri Aug 16 00:00:00 EDT 2019},
month = {Fri Aug 16 00:00:00 EDT 2019}
}
Web of Science
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