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ReaxFF-based molecular dynamics study of bio-derived polycyclic alkanes as potential alternative jet fuels

Summary

This wiki page registers a second PDF bytes for the Fuel article DOI 10.1016/j.fuel.2020.118548 (filename Kwon_Lele_Fuel_2020_Jetfuel.pdf); the scientific content is the same peer-reviewed work summarized on [[2020kwon-fuel-279-202-reaxff-based-molecular]], which uses the alternate path Kwon_Fuel_2020_polycyclic_alkanes_jet_fuel.pdf. The publication investigates early-stage pyrolysis of bio-derived head-to-head polycyclic alkanes HtH-1 (C₁₈H₃₂) and HtH-2 (C₁₈H₃₄) as high energy-density aviation fuel candidates, using ReaxFF-based molecular dynamics. The abstract reports global Arrhenius parameters (activation energies and pre-exponential factors) for overall decomposition, a temperature-dependent decomposition mechanism from systematic reaction analysis, comparison to fuels such as JP-10, product distributions connected to sooting tendency, and binary mixtures where the two components react largely through unimolecular channels with weak cross-talk. Retaining two PDFs documents manifest and hashing history; for citation workflows operators should pick one canonical file unless both scans are intentionally kept.

Methods

Corpus / PDF role. This slug registers a second PDF bytes for DOI 10.1016/j.fuel.2020.118548 (Kwon_Lele_Fuel_2020_Jetfuel.pdf); protocol text and kinetics are the same peer-reviewed work as [[2020kwon-fuel-279-202-reaxff-based-molecular]].

1 — MD application (ReaxFF pyrolysis, same article as the canonical PDF). ReaxFF reactive molecular dynamics in LAMMPS for gas-phase pyrolysis of HtH-1 / HtH-2 in 3D periodic (PBC) cells; system composition is O(10²) atoms from ~40 molecules per setup in the protocol documented for this DOI on [[2020kwon-venue-paper]] / [[2020kwon-fuel-279-202-reaxff-based-molecular]]. Target temperature in K and ρ (e.g. 1500–3000 K and 0.1–0.3 kg dm⁻³ ranges in the galley-level notes for this DOI): use VOR PDF (not re-typed here). Timestep (fs), equilibration (ps), and production (ns): in the same source; thermostat (e.g. Berendsen with 100 fs damping in the galley sibling); NVT (constant-volume vapor at set ρ). Barostat / NPT / hydrostatic pressure: N/A for stages where ρ is held fixed (NVT-like); N/A in the thermobaric sense unless the VOR adds NPT (verify in VOR). Duration in ps / ns: see Fuel article. E-field, umbrella, metadynamics, replica sampling: N/A.

2 — Force-field training. N/A (uses an existing C/H ReaxFF).

3 — Static QM / DFT as headline. N/A.

Findings

The abstract and body conclusions are unchanged between PDF copies: HtH-1 decomposes faster than HtH-2 at the same temperature and density, and both can exceed JP-10 in the compared decomposition metrics. At lower temperature, central C–C scission between cyclohexane rings dominates for both fuels; at higher temperature, C–CH₃ bond breaking becomes dominant, attributed to entropy-favored fragmentation. Major products are C₅H₈ and C₄H₈ for HtH-1, and C₄H₈ and C₂H₄ for HtH-2, implying higher sooting tendency for HtH-1, consistent with experimental measurements quoted by the authors. In mixtures, HtH-1 and HtH-2 decompose by unimolecular reactions with little intermolecular coupling. The work is presented as showing how ReaxFF can support pyrolysis and combustion chemistry studies and kinetic model development without a priori reaction lists.

Limitations

ReaxFF kinetics are empirical; mapping to flame chemistry and soot formation needs further validation. Maintaining two PDFs for one DOI can confuse checksum-based automation—prefer a single canonical blob unless both are required.

Relevance to group

Penn State / van Duin-group contribution to sustainable aviation chemistry via ReaxFF pyrolysis workflows.

Citations and evidence anchors

Reader notes (navigation)