Reactive Molecular Dynamics Simulations and Quantum Chemistry Calculations To Investigate Soot-Relevant Reaction Pathways for Hexylamine Isomers

Kwon, Hyunguk; Etz, Brian D.; Montgomery, Matthew J.; Messerly, Richard; Shabnam, Sharmin; Vyas, Shubham; van Duin, Adri C. T.; McEnally, Charles S.; Pfefferle, Lisa D.; Kim, Seonah; Xuan, Yuan

doi:10.1021/acs.jpca.0c03355

Reactive Molecular Dynamics Simulations and Quantum Chemistry Calculations To Investigate Soot-Relevant Reaction Pathways for Hexylamine Isomers

Journal Article · Mon May 04 00:00:00 EDT 2020 · Journal of Physical Chemistry A

DOI:https://doi.org/10.1021/acs.jpca.0c03355· OSTI ID:1660005

Kwon, Hyunguk; Etz, Brian D.; Montgomery, Matthew J.; Messerly, Richard; Shabnam, Sharmin; Vyas, Shubham; van Duin, Adri C. T.; McEnally, Charles S.; Pfefferle, Lisa D.; ; Xuan, Yuan

Sooting tendencies of a series of nitrogen-containing hydrocarbons (NHCs) have been recently characterized experimentally using the yield sooting index (YSI) methodology. This work aims to identify soot-relevant reaction pathways for three selected C6H15N amines, namely, dipropylamine (DPA), diisopropylamine (DIPA), and 3,3-dimethylbutylamine (DMBA) using ReaxFF molecular dynamics (MD) simulations and quantum mechanical (QM) calculations and to interpret the experimentally observed trends. ReaxFF MD simulations are performed to determine the important intermediate species and radicals involved in the fuel decomposition and soot formation processes. QM calculations are employed to extensively search for chemical reactions involving these species and radicals based on the ReaxFF MD results and also to quantitatively characterize the potential energy surfaces. Specifically, ReaxFF simulations are carried out in the NVT ensemble at 1400, 1600, and 1800 K, where soot has been identified to form in the YSI experiment. These simulations account for the interactions among test fuel molecules and pre-existing radicals and intermediate species generated from rich methane combustion, using a recently proposed simulation framework. ReaxFF simulations predict that the reactivity of the amines decrease in the order DIPA > DPA > DMBA, independent of temperature. Both QM calculations and ReaxFF simulations predict that C2H4, C3H6, and C4H8 are the main nonaromatic soot precursors formed during the decomposition of DPA, DIPA, and DMBA, respectively, and the associated reaction pathways are identified for each amine. Both theoretical methods predict that sooting tendency increases in the order DPA, DIPA, and DMBA, consistent with the experimentally measured trend in YSI. This work demonstrates that sooting tendencies and soot-relevant reaction pathways of fuels with unknown chemical kinetics can be identified efficiently through combined ReaxFF and QM simulations. Overall, predictions from ReaxFF simulations and QM calculations are consistent, in terms of fuel reactivity, major intermediates, and major nonaromatic soot precursors.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

DOE Contract Number:: AC36-08GO28308; AC36-08GO28308

OSTI ID:: 1660005

Report Number(s):: NREL/JA-2800-77224; MainId:26170; UUID:50e24ccd-e1ed-4f11-b7de-a49692ae1f08; MainAdminID:13755

Journal Information:: Journal of Physical Chemistry A, Journal Name: Journal of Physical Chemistry A Journal Issue: 21 Vol. 124

Country of Publication:: United States

Language:: English

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