Year: 2026
Type: preprint
Abstract: This work presents an atom-conserving and interpretable graph neural network (GNN) for combustion kinetic model generation, where atoms are represented as nodes, covalent bonds are represented as edges, and reactions are represented as bond-rearrangement operations. Its artificial-intelligence (AI) contribution is a reaction generator that extends a standard Graph Isomorphism Network with Edges (GINE) architecture through reaction-context embeddings, reaction branching & third-body reaction inputs, Arrhenius-rate-parameter prediction, pairwise decoding, and stochastic inference over evolving reactant pools. Trained on the Li–Dryer hydrogen combustion kinetic model (8 species and 21 reactions), the GNN reproduces trained chemistry and generates element-balanced new reactions and intermediate species outside the training dataset, many of which have experimental analogues. When trained on a subset of the Li–Dryer dataset, the model recovered most held-out reactions and revealed relationships between samples (reactions) in the model’s latent space. The results suggest that the model learns transferable local reaction structures and generates valid species and reactions. As with any reaction generators, the generated reaction models require thermochemical and kinetic verification; the intended engineering application is low-cost reaction-pathway exploration for new fuels and prioritization of experiments and first-principles calculations to develop new combustion kinetic models.
Source: ChemRxiv
Institution: University of Minnesota
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: green
Award: G6003418082
OpenAlex ID: W7223094513